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redis_commands.c
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PhpRedis

The phpredis extension provides an API for communicating with the Redis key-value store. It is released under the PHP License, version 3.01. This code has been developed and maintained by Owlient from November 2009 to March 2011.

You can send comments, patches, questions here on github, to n.favrefelix@gmail.com (@yowgi) 6851 , or to michael.grunder@gmail.com (@grumi78).

Table of contents

  1. Installing/Configuring
  2. Classes and methods

Installing/Configuring

Everything you should need to install PhpRedis on your system.

Installation

phpize
./configure [--enable-redis-igbinary]
make && make install

If you would like phpredis to serialize your data using the igbinary library, run configure with --enable-redis-igbinary. make install copies redis.so to an appropriate location, but you still need to enable the module in the PHP config file. To do so, either edit your php.ini or add a redis.ini file in /etc/php5/conf.d with the following contents: extension=redis.so.

You can generate a debian package for PHP5, accessible from Apache 2 by running ./mkdeb-apache2.sh or with dpkg-buildpackage or svn-buildpackage.

This extension exports a single class, Redis (and RedisException used in case of errors). Check out https://github.com/ukko/phpredis-phpdoc for a PHP stub that you can use in your IDE for code completion.

Installation on OSX

If the install fails on OSX, type the following commands in your shell before trying again:

MACOSX_DEPLOYMENT_TARGET=10.6
CFLAGS="-arch i386 -arch x86_64 -g -Os -pipe -no-cpp-precomp"
CCFLAGS="-arch i386 -arch x86_64 -g -Os -pipe"
CXXFLAGS="-arch i386 -arch x86_64 -g -Os -pipe"
LDFLAGS="-arch i386 -arch x86_64 -bind_at_load"
export CFLAGS CXXFLAGS LDFLAGS CCFLAGS MACOSX_DEPLOYMENT_TARGET

If that still fails and you are running Zend Server CE, try this right before "make": ./configure CFLAGS="-arch i386".

Taken from Compiling phpredis on Zend Server CE/OSX .

See also: Install Redis & PHP Extension PHPRedis with Macports.

You can install install it using Homebrew:

PHP Session handler

phpredis can be used to store PHP sessions. To do this, configure session.save_handler and session.save_path in your php.ini to tell phpredis where to store the sessions:

session.save_handler = redis
session.save_path = "tcp://host1:6379?weight=1, tcp://host2:6379?weight=2&timeout=2.5, tcp://host3:6379?weight=2"

session.save_path can have a simple host:port format too, but you need to provide the tcp:// scheme if you want to use the parameters. The following parameters are available:

  • weight (integer): the weight of a host is used in comparison with the others in order to customize the session distribution on several hosts. If host A has twice the weight of host B, it will get twice the amount of sessions. In the example, host1 stores 20% of all the sessions (1/(1+2+2)) while host2 and host3 each store 40% (2/1+2+2). The target host is determined once and for all at the start of the session, and doesn't change. The default weight is 1.
  • timeout (float): the connection timeout to a redis host, expressed in seconds. If the host is unreachable in that amount of time, the session storage will be unavailable for the client. The default timeout is very high (86400 seconds).
  • persistent (integer, should be 1 or 0): defines if a persistent connection should be used. (experimental setting)
  • prefix (string, defaults to "PHPREDIS_SESSION:"): used as a prefix to the Redis key in which the session is stored. The key is composed of the prefix followed by the session ID.
  • auth (string, empty by default): used to authenticate with the server prior to sending commands.
  • database (integer): selects a different database.

Sessions have a lifetime expressed in seconds and stored in the INI variable "session.gc_maxlifetime". You can change it with ini_set(). The session handler requires a version of Redis with the SETEX command (at least 2.0). phpredis can also connect to a unix domain socket: session.save_path = "unix:///var/run/redis/redis.sock?persistent=1&weight=1&database=0.

Building on Windows

See instructions from @char101 on how to build phpredis on Windows.

Distributed Redis Array

See dedicated page.

Redis Cluster support

See dedicated page.

Running the unit tests

phpredis uses a small custom unit test suite for testing functionality of the various classes. To run tests, simply do the following:

# Run tests for Redis class (note this is the default)
php tests/TestRedis.php --class Redis

# Run tests for RedisArray class
tests/mkring.sh start
php tests/TestRedis.php --class RedisArray
tests/mkring.sh stop

# Run tests for the RedisCluster class
tests/make-cluster.sh start
php tests/TestRedis.php --class RedisCluster
tests/make-cluster.sh stop

Note that it is possible to run only tests which match a substring of the test itself by passing the additional argument '--test ' when invoking.

# Just run the 'echo' test
php tests/TestRedis.php --class Redis --test echo

Classes and methods

Usage

  1. Class Redis
  2. Class RedisException
  3. Predefined constants

Class Redis

Description: Creates a Redis client

Example
$redis = new Redis();

Class RedisException

phpredis throws a RedisException object if it can't reach the Redis server. That can happen in case of connectivity issues, if the Redis service is down, or if the redis host is overloaded. In any other problematic case that does not involve an unreachable server (such as a key not existing, an invalid command, etc), phpredis will return FALSE.

Predefined constants

Description: Available Redis Constants

Redis data types, as returned by type

Redis::REDIS_STRING - String
Redis::REDIS_SET - Set
Redis::REDIS_LIST - List
Redis::REDIS_ZSET - Sorted set
Redis::REDIS_HASH - Hash
Redis::REDIS_NOT_FOUND - Not found / other

@TODO: OPT_SERIALIZER, AFTER, BEFORE,...

Connection

  1. connect, open - Connect to a server
  2. pconnect, popen - Connect to a server (persistent)
  3. auth - Authenticate to the server
  4. select - Change the selected database for the current connection
  5. close - Close the connection
  6. setOption - Set client option
  7. getOption - Get client option
  8. ping - Ping the server
  9. echo - Echo the given string

connect, open

Description: Connects to a Redis instance.

Parameters

host: string. can be a host, or the path to a unix domain socket port: int, optional timeout: float, value in seconds (optional, default is 0 meaning unlimited) reserved: should be NULL if retry_interval is specified retry_interval: int, value in milliseconds (optional)

Return value

BOOL: TRUE on success, FALSE on error.

Example
$redis->connect('127.0.0.1', 6379);
$redis->connect('127.0.0.1'); // port 6379 by default
$redis->connect('127.0.0.1', 6379, 2.5); // 2.5 sec timeout.
$redis->connect('/tmp/redis.sock'); // unix domain socket.
$redis->connect('127.0.0.1', 6379, 1, NULL, 100); // 1 sec timeout, 100ms delay between reconnection attempts.

pconnect, popen

Description: Connects to a Redis instance or reuse a connection already established with pconnect/popen.

The connection will not be closed on close or end of request until the php process ends. So be patient on to many open FD's (specially on redis server side) when using persistent connections on many servers connecting to one redis server.

Also more than one persistent connection can be made identified by either host + port + timeout or host + persistent_id or unix socket + timeout.

This feature is not available in threaded versions. pconnect and popen then working like their non persistent equivalents.

Parameters

host: string. can be a host, or the path to a unix domain socket port: int, optional timeout: float, value in seconds (optional, default is 0 meaning unlimited) persistent_id: string. identity for the requested persistent connection retry_interval: int, value in milliseconds (optional)

Return value

BOOL: TRUE on success, FALSE on error.

Example
$redis->pconnect('127.0.0.1', 6379);
$redis->pconnect('127.0.0.1'); // port 6379 by default - same connection like before.
$redis->pconnect('127.0.0.1', 6379, 2.5); // 2.5 sec timeout and would be another connection than the two before.
$redis->pconnect('127.0.0.1', 6379, 2.5, 'x'); // x is sent as persistent_id and would be another connection the the three before.
$redis->pconnect('/tmp/redis.sock'); // unix domain socket - would be another connection than the four before.

auth

Description: Authenticate the connection using a password. Warning: The password is sent in plain-text over the network.

Parameters

STRING: password

Return value

BOOL: TRUE if the connection is authenticated, FALSE otherwise.

Example
$redis->auth('foobared');

select

Description: Change the selected database for the current connection.

Parameters

INTEGER: dbindex, the database number to switch to.

Return value

TRUE in case of success, FALSE in case of failure.

Example

See method for example: move

close

Description: Disconnects from the Redis instance, except when pconnect is used.

setOption

Description: Set client option.

Parameters

parameter name parameter value

Return value

BOOL: TRUE on success, FALSE on error.

Example
$redis->setOption(Redis::OPT_SERIALIZER, Redis::SERIALIZER_NONE);	// don't serialize data
$redis->setOption(Redis::OPT_SERIALIZER, Redis::SERIALIZER_PHP);	// use built-in serialize/unserialize
$redis->setOption(Redis::OPT_SERIALIZER, Redis::SERIALIZER_IGBINARY);	// use igBinary serialize/unserialize

$redis->setOption(Redis::OPT_PREFIX, 'myAppName:');	// use custom prefix on all keys

/* Options for the SCAN family of commands, indicating whether to abstract
   empty results from the user.  If set to SCAN_NORETRY (the default), phpredis
   will just issue one SCAN command at a time, sometimes returning an empty
   array of results.  If set to SCAN_RETRY, phpredis will retry the scan command
   until keys come back OR Redis returns an iterator of zero
*/
$redis->setOption(Redis::OPT_SCAN, Redis::SCAN_NORETRY);
$redis->setOption(Redis::OPT_SCAN, Redis::SCAN_RETRY);

getOption

Description: Get client option.

Parameters

parameter name

Return value

Parameter value.

Example
$redis->getOption(Redis::OPT_SERIALIZER);	// return Redis::SERIALIZER_NONE, Redis::SERIALIZER_PHP, or Redis::SERIALIZER_IGBINARY.

ping

Description: Check the current connection status

Parameters

(none)

Return value

STRING: +PONG on success. Throws a RedisException object on connectivity error, as described above.

echo

Description: Sends a string to Redis, which replies with the same string

Parameters

STRING: The message to send.

Return value

STRING: the same message.

Server

  1. bgrewriteaof - Asynchronously rewrite the append-only file
  2. bgsave - Asynchronously save the dataset to disk (in background)
  3. config - Get or Set the Redis server configuration parameters
  4. dbSize - Return the number of keys in selected database
  5. flushAll - Remove all keys from all databases
  6. flushDB - Remove all keys from the current database
  7. info - Get information and statistics about the server
  8. lastSave - Get the timestamp of the last disk save
  9. resetStat - Reset the stats returned by info method.
  10. save - Synchronously save the dataset to disk (wait to complete)
  11. slaveof - Make the server a slave of another instance, or promote it to master
  12. time - Return the current server time
  13. slowlog - Access the Redis slowlog entries

bgrewriteaof

Description: Start the background rewrite of AOF (Append-Only File)

Parameters

None.

Return value

BOOL: TRUE in case of success, FALSE in case of failure.

Example
$redis->bgrewriteaof();

bgsave

Description: Asynchronously save the dataset to disk (in background)

Parameters

None.

Return value

BOOL: TRUE in case of success, FALSE in case of failure. If a save is already running, this command will fail and return FALSE.

Example
$redis->bgSave();

config

Description: Get or Set the Redis server configuration parameters.

Parameters

operation (string) either GET or SET key string for SET, glob-pattern for GET. See http://redis.io/commands/config-get for examples. value optional string (only for SET)

Return value

Associative array for GET, key -> value bool for SET

Examples
$redis->config("GET", "*max-*-entries*");
$redis->config("SET", "dir", "/var/run/redis/dumps/");

dbSize

Description: Return the number of keys in selected database.

Parameters

None.

Return value

INTEGER: DB size, in number of keys.

Example
$count = $redis->dbSize();
echo "Redis has $count keys\n";

flushAll

Description: Remove all keys from all databases.

Parameters

None.

Return value

BOOL: Always TRUE.

Example
$redis->flushAll();

flushDB

Description: Remove all keys from the current database.

Parameters

None.

Return value

BOOL: Always TRUE.

Example
$redis->flushDB();

info

Description: Get information and statistics about the server

Returns an associative array that provides information about the server. Passing no arguments to INFO will call the standard REDIS INFO command, which returns information such as the following:

  • redis_version
  • arch_bits
  • uptime_in_seconds
  • uptime_in_days
  • connected_clients
  • connected_slaves
  • used_memory
  • changes_since_last_save
  • bgsave_in_progress
  • last_save_time
  • 10000 total_connections_received
  • total_commands_processed
  • role

You can pass a variety of options to INFO (per the Redis documentation), which will modify what is returned.

Parameters

option: The option to provide redis (e.g. "COMMANDSTATS", "CPU")

Example
$redis->info(); /* standard redis INFO command */
$redis->info("COMMANDSTATS"); /* Information on the commands that have been run (>=2.6 only)
$redis->info("CPU"); /* just CPU information from Redis INFO */

lastSave

Description: Returns the timestamp of the last disk save.

Parameters

None.

Return value

INT: timestamp.

Example
$redis->lastSave();

resetStat

Description: Reset the stats returned by info method.

These are the counters that are reset:

  • Keyspace hits
  • Keyspace misses
  • Number of commands processed
  • Number of connections received
  • Number of expired keys
Parameters

None.

Return value

BOOL: TRUE in case of success, FALSE in case of failure.

Example
$redis->resetStat();

save

Description: Synchronously save the dataset to disk (wait to complete)

Parameters

None.

Return value

BOOL: TRUE in case of success, FALSE in case of failure. If a save is already running, this command will fail and return FALSE.

Example
$redis->save();

slaveof

Description: Changes the slave status

Parameters

Either host (string) and port (int), or no parameter to stop being a slave.

Return value

BOOL: TRUE in case of success, FALSE in case of failure.

Example
$redis->slaveof('10.0.1.7', 6379);
/* ... */
$redis->slaveof();

time

Description: Return the current server time.

Parameters

(none)

Return value

If successfull, the time will come back as an associative array with element zero being the unix timestamp, and element one being microseconds.

Examples
$redis->time();

slowlog

Description: Access the Redis slowlog

Parameters

Operation (string): This can be either GET, LEN, or RESET Length (integer), optional: If executing a SLOWLOG GET command, you can pass an optional length.

Return value

The return value of SLOWLOG will depend on which operation was performed. SLOWLOG GET: Array of slowlog entries, as provided by Redis SLOGLOG LEN: Integer, the length of the slowlog SLOWLOG RESET: Boolean, depending on success

Examples
// Get ten slowlog entries
$redis->slowlog('get', 10);
// Get the default number of slowlog entries

$redis->slowlog('get');
// Reset our slowlog
$redis->slowlog('reset');

// Retrieve slowlog length
$redis->slowlog('len');

Keys and Strings

Strings

  • append - Append a value to a key
  • bitcount - Count set bits in a string
  • bitop - Perform bitwise operations between strings
  • decr, decrBy - Decrement the value of a key
  • get - Get the value of a key
  • getBit - Returns the bit value at offset in the string value stored at key
  • getRange - Get a substring of the string stored at a key
  • getSet - Set the string value of a key and return its old value
  • incr, incrBy - Increment the value of a key
  • incrByFloat - Increment the float value of a key by the given amount
  • mGet, getMultiple - Get the values of all the given keys
  • mSet, mSetNX - Set multiple keys to multiple values
  • set - Set the string value of a key
  • setBit - Sets or clears the bit at offset in the string value stored at key
  • setex, psetex - Set the value and expiration of a key
  • setnx - Set the value of a key, only if the key does not exist
  • setRange - Overwrite part of a string at key starting at the specified offset
  • strlen - Get the length of the value stored in a key

Keys

  • del, delete - Delete a key
  • dump - Return a serialized version of the value stored at the specified key.
  • exists - Determine if a key exists
  • expire, setTimeout, pexpire - Set a key's time to live in seconds
  • expireAt, pexpireAt - Set the expiration for a key as a UNIX timestamp
  • keys, getKeys - Find all keys matching the given pattern
  • scan - Scan for keys in the keyspace (Redis >= 2.8.0)
  • migrate - Atomically transfer a key from a Redis instance to another one
  • move - Move a key to another database
  • object - Inspect the internals of Redis objects
  • persist - Remove the expiration from a key
  • randomKey - Return a random key from the keyspace
  • rename, renameKey - Rename a key
  • renameNx - Rename a key, only if the new key does not exist
  • type - Determine the type stored at key
  • sort - Sort the elements in a list, set or sorted set
  • ttl, pttl - Get the time to live for a key
  • restore - Create a key using the provided serialized value, previously obtained with dump.

get

Description: Get the value related to the specified key

Parameters

key

Return value

String or Bool: If key didn't exist, FALSE is returned. Otherwise, the value related to this key is returned.

Examples
$redis->get('key');

set

Description: Set the string value in argument as value of the key. If you're using Redis >= 2.6.12, you can pass extended options as explained below

Parameters

Key Value Timeout or Options Array (optional). If you pass an integer, phpredis will redirect to SETEX, and will try to use Redis >= 2.6.12 extended options if you pass an array with valid values

Return value

Bool TRUE if the command is successful.

Examples
// Simple key -> value set
$redis->set('key', 'value');

// Will redirect, and actually make an SETEX call
$redis->set('key','value', 10);

// Will set the key, if it doesn't exist, with a ttl of 10 seconds
$redis->set('key', 'value', Array('nx', 'ex'=>10));

// Will set a key, if it does exist, with a ttl of 1000 miliseconds
$redis->set('key', 'value', Array('xx', 'px'=>1000));

setex, psetex

Description: Set the string value in argument as value of the key, with a time to live. PSETEX uses a TTL in milliseconds.

Parameters

Key TTL Value

Return value

Bool TRUE if the command is successful.

Examples
$redis->setex('key', 3600, 'value'); // sets key → value, with 1h TTL.
$redis->psetex('key', 100, 'value'); // sets key → value, with 0.1 sec TTL.

setnx

Description: Set the string value in argument as value of the key if the key doesn't already exist in the database.

Parameters

key value

Return value

Bool TRUE in case of success, FALSE in case of failure.

Examples
$redis->setnx('key', 'value'); /* return TRUE */
$redis->setnx('key', 'value'); /* return FALSE */

del, delete

Description: Remove specified keys.

Parameters

An array of keys, or an undefined number of parameters, each a key: key1 key2 key3 ... keyN

Return value

Long Number of keys deleted.

Examples
$redis->set('key1', 'val1');
$redis->set('key2', 'val2');
$redis->set('key3', 'val3');
$redis->set('key4', 'val4');

$redis->delete('key1', 'key2'); /* return 2 */
$redis->delete(array('key3', 'key4')); /* return 2 */

exists

Description: Verify if the specified key exists.

Parameters

key

Return value

BOOL: If the key exists, return TRUE, otherwise return FALSE.

Examples
$redis->set('key', 'value');
$redis->exists('key'); /*  TRUE */
$redis->exists('NonExistingKey'); /* FALSE */

incr, incrBy

Description: Increment the number stored at key by one. If the second argument is filled, it will be used as the integer value of the increment.

Parameters

key value: value that will be added to key (only for incrBy)

Return value

INT the new value

Examples
$redis->incr('key1'); /* key1 didn't exists, set to 0 before the increment */
					  /* and now has the value 1  */

$redis->incr('key1'); /* 2 */
$redis->incr('key1'); /* 3 */
$redis->incr('key1'); /* 4 */
$redis->incrBy('key1', 10); /* 14 */

incrByFloat

Description: Increment the key with floating point precision.

Parameters

key value: (float) value that will be added to the key

Return value

FLOAT the new value

Examples
$redis->incrByFloat('key1', 1.5); /* key1 didn't exist, so it will now be 1.5 */


$redis->incrByFloat('key1', 1.5); /* 3 */
$redis->incrByFloat('key1', -1.5); /* 1.5 */
$redis->incrByFloat('key1', 2.5); /* 4 */

decr, decrBy

Description: Decrement the number stored at key by one. If the second argument is filled, it will be used as the integer value of the decrement.

Parameters

key value: value that will be substracted to key (only for decrBy)

Return value

INT the new value

Examples
$redis->decr('key1'); /* key1 didn't exists, set to 0 before the increment */
					  /* and now has the value -1  */

$redis->decr('key1'); /* -2 */
$redis->decr('key1'); /* -3 */
$redis->decrBy('key1', 10); /* -13 */

mGet, getMultiple

Description: Get the values of all the specified keys. If one or more keys dont exist, the array will contain FALSE at the position of the key.

Parameters

Array: Array containing the list of the keys

Return value

Array: Array containing the values related to keys in argument

Examples
$redis->set('key1', 'value1');
$redis->set('key2', 'value2');
$redis->set('key3', 'value3');
$redis->mGet(array('key1', 'key2', 'key3')); /* array('value1', 'value2', 'value3');
$redis->mGet(array('key0', 'key1', 'key5')); /* array(`FALSE`, 'value2', `FALSE`);

getSet

Description: Sets a value and returns the previous entry at that key.

Parameters

Key: key

STRING: value

Return value

A string, the previous value located at this key.

Example
$redis->set('x', '42');
$exValue = $redis->getSet('x', 'lol');	// return '42', replaces x by 'lol'
$newValue = $redis->get('x')'		// return 'lol'

randomKey

Description: Returns a random key.

Parameters

None.

Return value

STRING: an existing key in redis.

Example
$key = $redis->randomKey();
$surprise = $redis->get($key);	// who knows what's in there.

move

Description: Moves a key to a different database.

Parameters

Key: key, the key to move.

INTEGER: dbindex, the database number to move the key to.

Return value

BOOL: TRUE in case of success, FALSE in case of failure.

Example
$redis->select(0);	// switch to DB 0
$redis->set('x', '42');	// write 42 to x
$redis->move('x', 1);	// move to DB 1
$redis->select(1);	// switch to DB 1
$redis->get('x');	// will return 42

rename, renameKey

Description: Renames a key.

Parameters

STRING: srckey, the key to rename.

STRING: dstkey, the new name for the key.

Return value

BOOL: TRUE in case of success, FALSE in case of failure.

Example
$redis->set('x', '42');
$redis->rename('x', 'y');
$redis->get('y'); 	// → 42
$redis->get('x'); 	// → `FALSE`

renameNx

Description: Same as rename, but will not replace a key if the destination already exists. This is the same behaviour as setNx.

expire, setTimeout, pexpire

Description: Sets an expiration date (a timeout) on an item. pexpire requires a TTL in milliseconds.

Parameters

Key: key. The key that will disappear.

Integer: ttl. The key's remaining Time To Live, in seconds.

Return value

BOOL: TRUE in case of success, FALSE in case of failure.

Example
$redis->set('x', '42');
$redis->setTimeout('x', 3);	// x will disappear in 3 seconds.
sleep(5);				// wait 5 seconds
$redis->get('x'); 		// will return `FALSE`, as 'x' has expired.

expireAt, pexpireAt

Description: Sets an expiration date (a timestamp) on an item. pexpireAt requires a timestamp in milliseconds.

Parameters

Key: key. The key that will disappear.

Integer: Unix timestamp. The key's date of death, in seconds from Epoch time.

Return value

BOOL: TRUE in case of success, FALSE in case of failure.

Example
$redis->set('x', '42');
$now = time(NULL); // current timestamp
$redis->expireAt('x', $now + 3);	// x will disappear in 3 seconds.
sleep(5);				// wait 5 seconds
$redis->get('x'); 		// will return `FALSE`, as 'x' has expired.

keys, getKeys

Description: Returns the keys that match a certain pattern.

Parameters

STRING: pattern, using '*' as a wildcard.

Return value

Array of STRING: The keys that match a certain pattern.

Example
$allKeys = $redis->keys('*');	// all keys will match this.
$keyWithUserPrefix = $redis->keys('user*');

scan

Description: Scan the keyspace for keys

Parameters

LONG (reference): Iterator, initialized to NULL STRING, Optional: Pattern to match LONG, Optional: Count of keys per iteration (only a suggestion to Redis)

Return value

Array, boolean: This function will return an array of keys or FALSE if there are no more keys

Example
$it = NULL; /* Initialize our iterator to NULL */
$redis->setOption(Redis::OPT_SCAN, Redis::SCAN_RETRY); /* retry when we get no keys back */
while($arr_keys = $redis->scan($it)) {
    foreach($arr_keys as $str_key) {
        echo "Here is a key: $str_key\n";
    }
    echo "No more keys to scan!\n";
}

object

Description: Describes the object pointed to by a key.

Parameters

The information to retrieve (string) and the key (string). Info can be one of the following:

  • "encoding"
  • "refcount"
  • "idletime"
Return value

STRING for "encoding", LONG for "refcount" and "idletime", FALSE if the key doesn't exist.

Example
$redis->object("encoding", "l"); // → ziplist
$redis->object("refcount", "l"); // → 1
$redis->object("idletime", "l"); // → 400 (in seconds, with a precision of 10 seconds).

type

Description: Returns the type of data pointed by a given key.

Parameters

Key: key

Return value

Depending on the type of the data pointed by the key, this method will return the following value: string: Redis::REDIS_STRING set: Redis::REDIS_SET list: Redis::REDIS_LIST zset: Redis::REDIS_ZSET hash: Redis::REDIS_HASH other: Redis::REDIS_NOT_FOUND

Example
$redis->type('key');

append

Description: Append specified string to the string stored in specified key.

Parameters

Key Value

Return value

INTEGER: Size of the value after the append

Example
$redis->set('key', 'value1');
$redis->append('key', 'value2'); /* 12 */
$redis->get('key'); /* 'value1value2' */

getRange

Description: Return a substring of a larger string

Note: substr also supported but deprecated in redis.

Parameters

key start end

Return value

STRING: the substring

Example
$redis->set('key', 'string value');
$redis->getRange('key', 0, 5); /* 'string' */
$redis->getRange('key', -5, -1); /* 'value' */

setRange

Description: Changes a substring of a larger string.

Parameters

key offset value

Return value

STRING: the length of the string after it was modified.

Example
$redis->set('key', 'Hello world');
$redis->setRange('key', 6, "redis"); /* returns 11 */
$redis->get('key'); /* "Hello redis" */

strlen

Description: Get the length of a string value.

Parameters

key

Return value

INTEGER

Example
$redis->set('key', 'value');
$redis->strlen('key'); /* 5 */

getBit

Description: Return a single bit out of a larger string

Parameters

key offset

Return value

LONG: the bit value (0 or 1)

Example
$redis->set('key', "\x7f"); // this is 0111 1111
$redis->getBit('key', 0); /* 0 */
$redis->getBit('key', 1); /* 1 */

setBit

Description: Changes a single bit of a string.

Parameters

key offset value: bool or int (1 or 0)

Return value

LONG: 0 or 1, the value of the bit before it was set.

Example
$redis->set('key', "*");	// ord("*") = 42 = 0x2f = "0010 1010"
$redis->setBit('key', 5, 1); /* returns 0 */
$redis->setBit('key', 7, 1); /* returns 0 */
$redis->get('key'); /* chr(0x2f) = "/" = b("0010 1111") */

bitop

Description: Bitwise operation on multiple keys.

Parameters

operation: either "AND", "OR", "NOT", "XOR" ret_key: return key key1 key2...

Return value

LONG: The size of the string stored in the destination key.

bitcount

Description: Count bits in a string.

Parameters

key

Return value

LONG: The number of bits set to 1 in the value behind the input key.

sort

Description: Sort the elements in a list, set or sorted set.

Parameters

Key: key Options: array(key => value, ...) - optional, with the following keys and values:

    'by' => 'some_pattern_*',
    'limit' => array(0, 1),
    'get' => 'some_other_pattern_*' or an array of patterns,
    'sort' => 'asc' or 'desc',
    'alpha' => TRUE,
    'store' => 'external-key'
Return value

An array of values, or a number corresponding to the number of elements stored if that was used.

Example
$redis->delete('s');
$redis->sadd('s', 5);
$redis->sadd('s', 4);
$redis->sadd('s', 2);
$redis->sadd('s', 1);
$redis->sadd('s', 3);

var_dump($redis->sort('s')); // 1,2,3,4,5
var_dump($redis->sort('s', array('sort' => 'desc'))); // 5,4,3,2,1
var_dump($redis->sort('s', array('sort' => 'desc', 'store' => 'out'))); // (int)5

ttl, pttl

Description: Returns the time to live left for a given key in seconds (ttl), or milliseconds (pttl).

Parameters

Key: key

Return value

LONG: The time to live in seconds. If the key has no ttl, -1 will be returned, and -2 if the key doesn't exist.

Example
$redis->ttl('key');

persist

Description: Remove the expiration timer from a key.

Parameters

Key: key

Return value

BOOL: TRUE if a timeout was removed, FALSE if the key didn’t exist or didn’t have an expiration timer.

Example
$redis->persist('key');

mset, msetnx

Description: Sets multiple key-value pairs in one atomic command. MSETNX only returns TRUE if all the keys were set (see SETNX).

Parameters

Pairs: array(key => value, ...)

Return value

Bool TRUE in case of success, FALSE in case of failure.

Example

$redis->mset(array('key0' => 'value0', 'key1' => 'value1'));
var_dump($redis->get('key0'));
var_dump($redis->get('key1'));

Output:

string(6) "value0"
string(6) "value1"

dump

Description: Dump a key out of a redis database, the value of which can later be passed into redis using the RESTORE command. The data that comes out of DUMP is a binary representation of the key as Redis stores it.

Parameters

key string

Return value

The Redis encoded value of the key, or FALSE if the key doesn't exist

Examples
$redis->set('foo', 'bar');
$val = $redis->dump('foo'); // $val will be the Redis encoded key value

restore

Description: Restore a key from the result of a DUMP operation.

Parameters

key string. The key name ttl integer. How long the key should live (if zero, no expire will be set on the key) value string (binary). The Redis encoded key value (from DUMP)

Examples
$redis->set('foo', 'bar');
$val = $redis->dump('foo');
$redis->restore('bar', 0, $val); // The key 'bar', will now be equal to the key 'foo'

migrate

Description: Migrates a key to a different Redis instance.

Parameters

host string. The destination host port integer. The TCP port to connect to. key string. The key to migrate. destination-db integer. The target DB. timeout integer. The maximum amount of time given to this transfer. copy boolean, optional. Should we send the COPY flag to redis replace boolean, optional. Should we send the REPLACE flag to redis

Examples
$redis->migrate('backup', 6379, 'foo', 0, 3600);
$redis->migrate('backup', 6379, 'foo', 0, 3600, true, true); /* copy and replace */
$redis->migrate('backup', 6379, 'foo', 0, 3600, false, true); /* just REPLACE flag */

Hashes

  • hDel - Delete one or more hash fields
  • hExists - Determine if a hash field exists
  • hGet - Get the value of a hash field
  • hGetAll - Get all the fields and values in a hash
  • hIncrBy - Increment the integer value of a hash field by the given number
  • hIncrByFloat - Increment the float value of a hash field by the given amount
  • hKeys - Get all the fields in a hash
  • hLen - Get the number of fields in a hash
  • hMGet - Get the values of all the given hash fields
  • hMSet - Set multiple hash fields to multiple values
  • hSet - Set the string value of a hash field
  • hSetNx - Set the value of a hash field, only if the field does not exist
  • hVals - Get all the values in a hash
  • hScan - Scan a hash key for members

hSet

Description: Adds a value to the hash stored at key.

Parameters

key hashKey value

Return value

LONG 1 if value didn't exist and was added successfully, 0 if the value was already present and was replaced, FALSE if there was an error.

Example
$redis->delete('h')
$redis->hSet('h', 'key1', 'hello'); /* 1, 'key1' => 'hello' in the hash at "h" */
$redis->hGet('h', 'key1'); /* returns "hello" */

$redis->hSet('h', 'key1', 'plop'); /* 0, value was replaced. */
$redis->hGet('h', 'key1'); /* returns "plop" */

hSetNx

Description: Adds a value to the hash stored at key only if this field isn't already in the hash.

Return value

BOOL TRUE if the field was set, FALSE if it was already present.

Example
$redis->delete('h')
$redis->hSetNx('h', 'key1', 'hello'); /* TRUE, 'key1' => 'hello' in the hash at "h" */
$redis->hSetNx('h', 'key1', 'world'); /* FALSE, 'key1' => 'hello' in the hash at "h". No change since the field wasn't replaced. */

hGet

Description: Gets a value from the hash stored at key. If the hash table doesn't exist, or the key doesn't exist, FALSE is returned.

Parameters

key hashKey

Return value

STRING The value, if the command executed successfully BOOL FALSE in case of failure

hLen

Description: Returns the length of a hash, in number of items

Parameters

key

Return value

LONG the number of items in a hash, FALSE if the key doesn't exist or isn't a hash.

Example
$redis->delete('h')
$redis->hSet('h', 'key1', 'hello');
$redis->hSet('h', 'key2', 'plop');
$redis->hLen('h'); /* returns 2 */

hDel

Description: Removes a value from the hash stored at key. If the hash table doesn't exist, or the key doesn't exist, FALSE is returned.

Parameters

key hashKey

Return value

BOOL TRUE in case of success, FALSE in case of failure

hKeys

Description: Returns the keys in a hash, as an array of strings.

Parameters

Key: key

Return value

An array of elements, the keys of the hash. This works like PHP's array_keys().

Example
$redis->delete('h');
$redis->hSet('h', 'a', 'x');
$redis->hSet('h', 'b', 'y');
$redis->hSet('h', 'c', 'z');
$redis->hSet('h', 'd', 't');
var_dump($redis->hKeys('h'));

Output:

array(4) {
  [0]=>
  string(1) "a"
  [1]=>
  string(1) "b"
  [2]=>
  string(1) "c"
  [3]=>
  string(1) "d"
}

The order is random and corresponds to redis' own internal representation of the set structure.

hVals

Description: Returns the values in a hash, as an array of strings.

Parameters

Key: key

Return value

An array of elements, the values of the hash. This works like PHP's array_values().

Example
$redis->delete('h');
$redis->hSet('h', 'a', 'x');
$redis->hSet('h', 'b', 'y');
$redis->hSet('h', 'c', 'z');
$redis->hSet('h', 'd', 't');
var_dump($redis->hVals('h'));

Output:

array(4) {
  [0]=>
  string(1) "x"
  [1]=>
  string(1) "y"
  [2]=>
  string(1) "z"
  [3]=>
  string(1) "t"
}

The order is random and corresponds to redis' own internal representation of the set structure.

hGetAll

Description: Returns the whole hash, as an array of strings indexed by strings.

Parameters

Key: key

Return value

An array of elements, the contents of the hash.

Example
$redis->delete('h');
$redis->hSet('h', 'a', 'x');
$redis->hSet('h', 'b', 'y');
$redis->hSet('h', 'c', 'z');
$redis->hSet('h', 'd', 't');
var_dump($redis->hGetAll('h'));

Output:

array(4) {
  ["a"]=>
  string(1) "x"
  ["b"]=>
  string(1) "y"
  ["c"]=>
  string(1) "z"
  ["d"]=>
  string(1) "t"
}

The order is random and corresponds to redis' own internal representation of the set structure.

hExists

Description: Verify if the specified member exists in a key.

Parameters

key memberKey

Return value

BOOL: If the member exists in the hash table, return TRUE, otherwise return FALSE.

Examples
$redis->hSet('h', 'a', 'x');
$redis->hExists('h', 'a'); /*  TRUE */
$redis->hExists('h', 'NonExistingKey'); /* FALSE */

hIncrBy

Description: Increments the value of a member from a hash by a given amount.

Parameters

key member value: (integer) value that will be added to the member's value

Return value

LONG the new value

Examples
$redis->delete('h');
$redis->hIncrBy('h', 'x', 2); /* returns 2: h[x] = 2 now. */
$redis->hIncrBy('h', 'x', 1); /* h[x] ← 2 + 1. Returns 3 */

hIncrByFloat

Description: Increments the value of a hash member by the provided float value

Parameters

key member value: (float) value that will be added to the member's value

Return value

FLOAT the new value

Examples
$redis->delete('h');
$redis->hIncrByFloat('h','x', 1.5); /* returns 1.5: h[x] = 1.5 now */
$redis->hIncrByFLoat('h', 'x', 1.5); /* returns 3.0: h[x] = 3.0 now */
$redis->hIncrByFloat('h', 'x', -3.0); /* returns 0.0: h[x] = 0.0 now */

hMSet

Description: Fills in a whole hash. Non-string values are converted to string, using the standard (string) cast. NULL values are stored as empty strings.

Parameters

key members: key → value array

Return value

BOOL

Examples
$redis->delete('user:1');
$redis->hMset('user:1', array('name' => 'Joe', 'salary' => 2000));
$redis->hIncrBy('user:1', 'salary', 100); // Joe earns 100 more now.

hMGet

Description: Retrieve the values associated to the specified fields in the hash.

Parameters

key memberKeys Array

Return value

Array An array of elements, the values of the specified fields in the hash, with the hash keys as array keys.

Examples
$redis->delete('h');
$redis->hSet('h', 'field1', 'value1');
$redis->hSet('h', 'field2', 'value2');
$redis->hmGet('h', array('field1', 'field2')); /* returns array('field1' => 'value1', 'field2' => 'value2') */

hScan

Description: Scan a HASH value for members, with an optional pattern and count

Parameters

key: String iterator: Long (reference) pattern: Optional pattern to match against count: How many keys to return in a go (only a sugestion to Redis)

Return value

Array An array of members that match our pattern

Examples
$it = NULL;
/* Don't ever return an empty array until we're done iterating */
$redis->setOption(Redis::OPT_SCAN, Redis::SCAN_RETRY);
while($arr_keys = $redis->hscan('hash', $it)) {
    foreach($arr_keys as $str_field => $str_value) {
        echo "$str_field => $str_value\n"; /* Print the hash member and value */
    }
}

Lists

  • blPop, brPop - Remove and get the first/last element in a list
  • brpoplpush - Pop a value from a list, push it to another list and return it
  • lIndex, lGet - Get an element from a list by its index
  • lInsert - Insert an element before or after another element in a list
  • lLen, lSize - Get the length/size of a list
  • lPop - Remove and get the first element in a list
  • lPush - Prepend one or multiple values to a list
  • lPushx - Prepend a value to a list, only if the list exists
  • lRange, lGetRange - Get a range of elements from a list
  • lRem, lRemove - Remove elements from a list
  • lSet - Set the value of an element in a list by its index
  • lTrim, listTrim - Trim a list to the specified range
  • rPop - Remove and get the last element in a list
  • rpoplpush - Remove the last element in a list, append it to another list and return it (redis >= 1.1)
  • rPush - Append one or multiple values to a list
  • rPushx - Append a value to a list, only if the list exists

blPop, brPop

Description: Is a blocking lPop(rPop) primitive. If at least one of the lists contains at least one element, the element will be popped from the head of the list and returned to the caller. If all the list identified by the keys passed in arguments are empty, blPop will block during the specified timeout until an element is pushed to one of those lists. This element will be popped.

Parameters

ARRAY Array containing the keys of the lists INTEGER Timeout Or STRING Key1 STRING Key2 STRING Key3 ... STRING Keyn INTEGER Timeout

Return value

ARRAY array('listName', 'element')

Example
/* Non blocking feature */
$redis->lPush('key1', 'A');
$redis->delete('key2');

$redis->blPop('key1', 'key2', 10); /* array('key1', 'A') */
/* OR */
$redis->blPop(array('key1', 'key2'), 10); /* array('key1', 'A') */

$redis->brPop('key1', 'key2', 10); /* array('key1', 'A') */
/* OR */
$redis->brPop(array('key1', 'key2'), 10); /* array('key1', 'A') */

/* Blocking feature */

/* process 1 */
$redis->delete('key1');
$redis->blPop('key1', 10);
/* blocking for 10 seconds */

/* process 2 */
$redis->lPush('key1', 'A');

/* process 1 */
/* array('key1', 'A') is returned*/

brpoplpush

Description: A blocking version of rpoplpush, with an integral timeout in the third parameter.

Parameters

Key: srckey Key: dstkey Long: timeout

Return value

STRING The element that was moved in case of success, FALSE in case of timeout.

lIndex, lGet

Description: Return the specified element of the list stored at the specified key.

0 the first element, 1 the second ... -1 the last element, -2 the penultimate ...

Return FALSE in case of a bad index or a key that doesn't point to a list.

Parameters

key index

Return value

String the element at this index Bool FALSE if the key identifies a non-string data type, or no value corresponds to this index in the list Key.

Example
$redis->rPush('key1', 'A');
$redis->rPush('key1', 'B');
$redis->rPush('key1', 'C'); /* key1 => [ 'A', 'B', 'C' ] */
$redis->lGet('key1', 0); /* 'A' */
$redis->lGet('key1', -1); /* 'C' */
$redis->lGet('key1', 10); /* `FALSE` */

lInsert

Description: Insert value in the list before or after the pivot value.

The parameter options specify the position of the insert (before or after). If the list didn't exists, or the pivot didn't exists, the value is not inserted.

Parameters

key position Redis::BEFORE | Redis::AFTER pivot value

Return value

The number of the elements in the list, -1 if the pivot didn't exists.

Example
$redis->delete('key1');
$redis->lInsert('key1', Redis::AFTER, 'A', 'X'); /* 0 */

$redis->lPush('key1', 'A');
$redis->lPush('key1', 'B');
$redis->lPush('key1', 'C');

$redis->lInsert('key1', Redis::BEFORE, 'C', 'X'); /* 4 */
$redis->lRange('key1', 0, -1); /* array('A', 'B', 'X', 'C') */

$redis->lInsert('key1', Redis::AFTER, 'C', 'Y'); /* 5 */
$redis->lRange('key1', 0, -1); /* array('A', 'B', 'X', 'C', 'Y') */

$redis->lInsert('key1', Redis::AFTER, 'W', 'value'); /* -1 */

lPop

Description: Return and remove the first element of the list.

Parameters

key

Return value

STRING if command executed successfully BOOL FALSE in case of failure (empty list)

Example
$redis->rPush('key1', 'A');
$redis->rPush('key1', 'B');
$redis->rPush('key1', 'C'); /* key1 => [ 'A', 'B', 'C' ] */
$redis->lPop('key1'); /* key1 => [ 'B', 'C' ] */

lPush

Description: Adds the string value to the head (left) of the list. Creates the list if the key didn't exist. If the key exists and is not a list, FALSE is returned.

Parameters

key value String, value to push in key

Return value

LONG The new length of the list in case of success, FALSE in case of Failure.

Examples
$redis->delete('key1');
$redis->lPush('key1', 'C'); // returns 1
$redis->lPush('key1', 'B'); // returns 2
$redis->lPush('key1', 'A'); // returns 3
/* key1 now points to the following list: [ 'A', 'B', 'C' ] */

lPushx

Description: Adds the string value to the head (left) of the list if the list exists.

Parameters

key value String, value to push in key

Return value

LONG The new length of the list in case of success, FALSE in case of Failure.

Examples
$redis->delete('key1');
$redis->lPushx('key1', 'A'); // returns 0
$redis->lPush('key1', 'A'); // returns 1
$redis->lPushx('key1', 'B'); // returns 2
$redis->lPushx('key1', 'C'); // returns 3
/* key1 now points to the following list: [ 'A', 'B', 'C' ] */

lRange, lGetRange

Description: Returns the specified elements of the list stored at the specified key in the range [start, end]. start and stop are interpretated as indices: 0 the first element, 1 the second ... -1 the last element, -2 the penultimate ...

Parameters

key start end

Return value

Array containing the values in specified range.

Example
$redis->rPush('key1', 'A');
$redis->rPush('key1', 'B');
$redis->rPush('key1', 'C');
$redis->lRange('key1', 0, -1); /* array('A', 'B', 'C') */

lRem, lRemove

Description: Removes the first count occurences of the value element from the list. If count is zero, all the matching elements are removed. If count is negative, elements are removed from tail to head.

Note: The argument order is not the same as in the Redis documentation. This difference is kept for compatibility reasons.

Parameters

key value count

Return value

LONG the number of elements to remove BOOL FALSE if the value identified by key is not a list.

Example
$redis->lPush('key1', 'A');
$redis->lPush('key1', 'B');
$redis->lPush('key1', 'C');
$redis->lPush('key1', 'A');
$redis->lPush('key1', 'A');

$redis->lRange('key1', 0, -1); /* array('A', 'A', 'C', 'B', 'A') */
$redis->lRem('key1', 'A', 2); /* 2 */
$redis->lRange('key1', 0, -1); /* array('C', 'B', 'A') */

lSet

Description: Set the list at index with the new value.

Parameters

key index value

Return value

BOOL TRUE if the new value is setted. FALSE if the index is out of range, or data type identified by key is not a list.

Example
$redis->rPush('key1', 'A');
$redis->rPush('key1', 'B');
$redis->rPush('key1', 'C'); /* key1 => [ 'A', 'B', 'C' ] */
$redis->lGet('key1', 0); /* 'A' */
$redis->lSet('key1', 0, 'X');
$redis->lGet('key1', 0); /* 'X' */

lTrim, listTrim

Description: Trims an existing list so that it will contain only a specified range of elements.

Parameters

key start stop

Return value

Array Bool return FALSE if the key identify a non-list value.

Example
$redis->rPush('key1', 'A');
$redis->rPush('key1', 'B');
$redis->rPush('key1', 'C');
$redis->lRange('key1', 0, -1); /* array('A', 'B', 'C') */
$redis->lTrim('key1', 0, 1);
$redis->lRange('key1', 0, -1); /* array('A', 'B') */

rPop

Description: Returns and removes the last element of the list.

Parameters

key

Return value

STRING if command executed successfully BOOL FALSE in case of failure (empty list)

Example
$redis->rPush('key1', 'A');
$redis->rPush('key1', 'B');
$redis->rPush('key1', 'C'); /* key1 => [ 'A', 'B', 'C' ] */
$redis->rPop('key1'); /* key1 => [ 'A', 'B' ] */

rpoplpush

Description: Pops a value from the tail of a list, and pushes it to the front of another list. Also return this value. (redis >= 1.1)

Parameters

Key: srckey Key: dstkey

Return value

STRING The element that was moved in case of success, FALSE in case of failure.

Example
$redis->delete('x', 'y');

$redis->lPush('x', 'abc');
$redis->lPush('x', 'def');
$redis->lPush('y', '123');
$redis->lPush('y', '456');

// move the last of x to the front of y.
var_dump($redis->rpoplpush('x', 'y'));
var_dump($redis->lRange('x', 0, -1));
var_dump($redis->lRange('y', 0, -1));

Output:

string(3) "abc"
array(1) {
  [0]=>
  string(3) "def"
}
array(3) {
  [0]=>
  string(3) "abc"
  [1]=>
  string(3) "456"
  [2]=>
  string(3) "123"
}

rPush

Description: Adds the string value to the tail (right) of the list. Creates the list if the key didn't exist. If the key exists and is not a list, FALSE is returned.

Parameters

key value String, value to push in key

Return value

LONG The new length of the list in case of success, FALSE in case of Failure.

Examples
$redis->delete('key1');
$redis->rPush('key1', 'A'); // returns 1
$redis->rPush('key1', 'B'); // returns 2
$redis->rPush('key1', 'C'); // returns 3
/* key1 now points to the following list: [ 'A', 'B', 'C' ] */

rPushx

Description: Adds the string value to the tail (right) of the list if the ist exists. FALSE in case of Failure.

Parameters

key value String, value to push in key

Return value

LONG The new length of the list in case of success, FALSE in case of Failure.

Examples
$redis->delete('key1');
$redis->rPushx('key1', 'A'); // returns 0
$redis->rPush('key1', 'A'); // returns 1
$redis->rPushx('key1', 'B'); // returns 2
$redis->rPushx('key1', 'C'); // returns 3
/* key1 now points to the following list: [ 'A', 'B', 'C' ] */

lLen, lSize

Description: Returns the size of a list identified by Key.

If the list didn't exist or is empty, the command returns 0. If the data type identified by Key is not a list, the command return FALSE.

Parameters

Key

Return value

LONG The size of the list identified by Key exists. BOOL FALSE if the data type identified by Key is not list

Example
$redis->rPush('key1', 'A');
$redis->rPush('key1', 'B');
$redis->rPush('key1', 'C'); /* key1 => [ 'A', 'B', 'C' ] */
$redis->lSize('key1');/* 3 */
$redis->rPop('key1');
$redis->lSize('key1');/* 2 */

Sets

  • sAdd - Add one or more members to a set
  • sCard, sSize - Get the number of members in a set
  • sDiff - Subtract multiple sets
  • sDiffStore - Subtract multiple sets and store the resulting set in a key
  • sInter - Intersect multiple sets
  • sInterStore - Intersect multiple sets and store the resulting set in a key
  • sIsMember, sContains - Determine if a given value is a member of a set
  • sMembers, sGetMembers - Get all the members in a set
  • sMove - Move a member from one set to another
  • sPop - Remove and return a random member from a set
  • sRandMember - Get one or multiple random members from a set
  • sRem, sRemove - Remove one or more members from a set
  • sUnion - Add multiple sets
  • sUnionStore - Add multiple sets and store the resulting set in a key
  • sScan - Scan a set for members

sAdd

Description: Adds a value to the set value stored at key. If this value is already in the set, FALSE is returned.

Parameters

key value

Return value

LONG the number of elements added to the set.

Example
$redis->sAdd('key1' , 'member1'); /* 1, 'key1' => {'member1'} */
$redis->sAdd('key1' , 'member2', 'member3'); /* 2, 'key1' => {'member1', 'member2', 'member3'}*/
$redis->sAdd('key1' , 'member2'); /* 0, 'key1' => {'member1', 'member2', 'member3'}*/

sCard, sSize

Description: Returns the cardinality of the set identified by key.

Parameters

key

Return value

LONG the cardinality of the set identified by key, 0 if the set doesn't exist.

Example
$redis->sAdd('key1' , 'member1');
$redis->sAdd('key1' , 'member2');
$redis->sAdd('key1' , 'member3'); /* 'key1' => {'member1', 'member2', 'member3'}*/
$redis->sCard('key1'); /* 3 */
$redis->sCard('keyX'); /* 0 */

sDiff

Description: Performs the difference between N sets and returns it.

Parameters

Keys: key1, key2, ... , keyN: Any number of keys corresponding to sets in redis.

Return value

Array of strings: The difference of the first set will all the others.

Example
$redis->delete('s0', 's1', 's2');

$redis->sAdd('s0', '1');
$redis->sAdd('s0', '2');
$redis->sAdd('s0', '3');
$redis->sAdd('s0', '4');

$redis->sAdd('s1', '1');
$redis->sAdd('s2', '3');

var_dump($redis->sDiff('s0', 's1', 's2'));

Return value: all elements of s0 that are neither in s1 nor in s2.

array(2) {
  [0]=>
  string(1) "4"
  [1]=>
  string(1) "2"
}

sDiffStore

Description: Performs the same action as sDiff, but stores the result in the first key

Parameters

Key: dstkey, the key to store the diff into.

Keys: key1, key2, ... , keyN: Any number of keys corresponding to sets in redis

Return value

INTEGER: The cardinality of the resulting set, or FALSE in case of a missing key.

Example
$redis->delete('s0', 's1', 's2');

$redis->sAdd('s0', '1');
$redis->sAdd('s0', '2');
$redis->sAdd('s0', '3');
$redis->sAdd('s0', '4');

$redis->sAdd('s1', '1');
$redis->sAdd('s2', '3');

var_dump($redis->sDiffStore('dst', 's0', 's1', 's2'));
var_dump($redis->sMembers('dst'));

Return value: the number of elements of s0 that are neither in s1 nor in s2.

int(2)
array(2) {
  [0]=>
  string(1) "4"
  [1]=>
  string(1) "2"
}

sInter

Description: Returns the members of a set resulting from the intersection of all the sets held at the specified keys.

If just a single key is specified, then this command produces the members of this set. If one of the keys is missing, FALSE is returned.

Parameters

key1, key2, keyN: keys identifying the different sets on which we will apply the intersection.

Return value

Array, contain the result of the intersection between those keys. If the intersection beteen the different sets is empty, the return value will be empty array.

Examples
$redis->sAdd('key1', 'val1');
$redis->sAdd('key1', 'val2');
$redis->sAdd('key1', 'val3');
$redis->sAdd('key1', 'val4');

$redis->sAdd('key2', 'val3');
$redis->sAdd('key2', 'val4');

$redis->sAdd('key3', 'val3');
$redis->sAdd('key3', 'val4');

var_dump($redis->sInter('key1', 'key2', 'key3'));

Output:

array(2) {
  [0]=>
  string(4) "val4"
  [1]=>
  string(4) "val3"
}

sInterStore

Description: Performs a sInter command and stores the result in a new set.

Parameters

Key: dstkey, the key to store the diff into.

Keys: key1, key2... keyN. key1..keyN are intersected as in sInter.

Return value

INTEGER: The cardinality of the resulting set, or FALSE in case of a missing key.

Example
$redis->sAdd('key1', 'val1');
$redis->sAdd('key1', 'val2');
$redis->sAdd('key1', 'val3');
$redis->sAdd('key1', 'val4');

$redis->sAdd('key2', 'val3');
$redis->sAdd('key2', 'val4');

$redis->sAdd('key3', 'val3');
$redis->sAdd('key3', 'val4');

var_dump($redis->sInterStore('output', 'key1', 'key2', 'key3'));
var_dump($redis->sMembers('output'));

Output:

int(2)

array(2) {
  [0]=>
  string(4) "val4"
  [1]=>
  string(4) "val3"
}

sIsMember, sContains

Description: Checks if value is a member of the set stored at the key key.

Parameters

key value

Return value

BOOL TRUE if value is a member of the set at key key, FALSE otherwise.

Example
$redis->sAdd('key1' , 'member1');
$redis->sAdd('key1' , 'member2');
$redis->sAdd('key1' , 'member3'); /* 'key1' => {'member1', 'member2', 'member3'}*/

$redis->sIsMember('key1', 'member1'); /* TRUE */
$redis->sIsMember('key1', 'memberX'); /* FALSE */

sMembers, sGetMembers

Description: Returns the contents of a set.

Parameters

Key: key

Return value

An array of elements, the contents of the set.

Example
$redis->delete('s');
$redis->sAdd('s', 'a');
$redis->sAdd('s', 'b');
$redis->sAdd('s', 'a');
$redis->sAdd('s', 'c');
var_dump($redis->sMembers('s'));

Output:

array(3) {
  [0]=>
  string(1) "c"
  [1]=>
  string(1) "a"
  [2]=>
  string(1) "b"
}

The order is random and corresponds to redis' own internal representation of the set structure.

sMove

Description: Moves the specified member from the set at srcKey to the set at dstKey.

Parameters

srcKey dstKey member

Return value

BOOL If the operation is successful, return TRUE. If the srcKey and/or dstKey didn't exist, and/or the member didn't exist in srcKey, FALSE is returned.

Example
$redis->sAdd('key1' , 'member11');
$redis->sAdd('key1' , 'member12');
$redis->sAdd('key1' , 'member13'); /* 'key1' => {'member11', 'member12', 'member13'}*/
$redis->sAdd('key2' , 'member21');
$redis->sAdd('key2' , 'member22'); /* 'key2' => {'member21', 'member22'}*/
$redis->sMove('key1', 'key2', 'member13'); /* 'key1' =>  {'member11', 'member12'} */
					/* 'key2' =>  {'member21', 'member22', 'member13'} */

sPop

Description: Removes and returns a random element from the set value at Key.

Parameters

key

Return value

String "popped" value Bool FALSE if set identified by key is empty or doesn't exist.

Example
$redis->sAdd('key1' , 'member1');
$redis->sAdd('key1' , 'member2');
$redis->sAdd('key1' , 'member3'); /* 'key1' => {'member3', 'member1', 'member2'}*/
$redis->sPop('key1'); /* 'member1', 'key1' => {'member3', 'member2'} */
$redis->sPop('key1'); /* 'member3', 'key1' => {'member2'} */

sRandMember

Description: Returns a random element from the set value at Key, without removing it.

Parameters

key count (Integer, optional)

Return value

If no count is provided, a random String value from the set will be returned. If a count is provided, an array of values from the set will be returned. Read about the different ways to use the count here: SRANDMEMBER Bool FALSE if set identified by key is empty or doesn't exist.

Example
$redis->sAdd('key1' , 'member1');
$redis->sAdd('key1' , 'member2');
$redis->sAdd('key1' , 'member3'); /* 'key1' => {'member3', 'member1', 'member2'}*/

// No count
$redis->sRandMember('key1'); /* 'member1', 'key1' => {'member3', 'member1', 'member2'} */
$redis->sRandMember('key1'); /* 'member3', 'key1' => {'member3', 'member1', 'member2'} */

// With a count
$redis->sRandMember('key1', 3); // Will return an array with all members from the set
$redis->sRandMember('key1', 2); // Will an array with 2 members of the set
$redis->sRandMember('key1', -100); // Will return an array of 100 elements, picked from our set (with dups)
$redis->sRandMember('empty-set', 100); // Will return an empty array
$redis->sRandMember('not-a-set', 100); // Will return FALSE

sRem, sRemove

Description: Removes the specified member from the set value stored at key.

Parameters

key member

Return value

LONG The number of elements removed from the set.

Example
$redis->sAdd('key1' , 'member1');
$redis->sAdd('key1' , 'member2');
$redis->sAdd('key1' , 'member3'); /* 'key1' => {'member1', 'member2', 'member3'}*/
$redis->sRem('key1', 'member2', 'member3'); /*return 2. 'key1' => {'member1'} */

sUnion

Description: Performs the union between N sets and returns it.

Parameters

Keys: key1, key2, ... , keyN: Any number of keys corresponding to sets in redis.

Return value

Array of strings: The union of all these sets.

Example
$redis->delete('s0', 's1', 's2');

$redis->sAdd('s0', '1');
$redis->sAdd('s0', '2');
$redis->sAdd('s1', '3');
$redis->sAdd('s1', '1');
$redis->sAdd('s2', '3');
$redis->sAdd('s2', '4');

var_dump($redis->sUnion('s0', 's1', 's2'));

Return value: all elements that are either in s0 or in s1 or in s2.

array(4) {
  [0]=>
  string(1) "3"
  [1]=>
  string(1) "4"
  [2]=>
  string(1) "1"
  [3]=>
  string(1) "2"
}

sUnionStore

Description: Performs the same action as sUnion, but stores the result in the first key

Parameters

Key: dstkey, the key to store the diff into.

Keys: key1, key2, ... , keyN: Any number of keys corresponding to sets in redis.

Return value

INTEGER: The cardinality of the resulting set, or FALSE in case of a missing key.

Example
$redis->delete('s0', 's1', 's2');

$redis->sAdd('s0', '1');
$redis->sAdd('s0', '2');
$redis->sAdd('s1', '3');
$redis->sAdd('s1', '1');
$redis->sAdd('s2', '3');
$redis->sAdd('s2', '4');

var_dump($redis->sUnionStore('dst', 's0', 's1', 's2'));
var_dump($redis->sMembers('dst'));

Return value: the number of elements that are either in s0 or in s1 or in s2.

int(4)
array(4) {
  [0]=>
  string(1) "3"
  [1]=>
  string(1) "4"
  [2]=>
  string(1) "1"
  [3]=>
  string(1) "2"
}

sScan

Description: Scan a set for members

Parameters

Key: The set to search iterator: LONG (reference) to the iterator as we go pattern: String, optional pattern to match against count: How many members to return at a time (Redis might return a different amount)

Return value

Array, boolean: PHPRedis will return an array of keys or FALSE when we're done iterating

Example
$it = NULL;
$redis->setOption(Redis::OPT_SCAN, Redis::SCAN_RETRY); /* don't return empty results until we're done */
while($arr_mems = $redis->sscan('set', $it, "*pattern*")) {
    foreach($arr_mems as $str_mem) {
        echo "Member: $str_mem\n";
    }
}

$it = NULL;
$redis->setOption(Redis::OPT_SCAN, Redis::SCAN_NORETRY); /* return after each iteration, even if empty */
while(($arr_mems = $redis->sscan('set', $it, "*pattern*"))!==FALSE) {
    if(count($arr_mems) > 0) {
        foreach($arr_mems as $str_mem) {
            echo "Member found: $str_mem\n";
        }
    } else {
        echo "No members in this iteration, iterator value: $it\n";
    }
}

Sorted sets

  • zAdd - Add one or more members to a sorted set or update its score if it already exists
  • zCard, zSize - Get the number of members in a sorted set
  • zCount - Count the members in a sorted set with scores within the given values
  • zIncrBy - Increment the score of a member in a sorted set
  • zInter - Intersect multiple sorted sets and store the resulting sorted set in a new key
  • zRange - Return a range of members in a sorted set, by index
  • zRangeByScore, zRevRangeByScore - Return a range of members in a sorted set, by score
  • zRangeByLex - Return a lexigraphical range from members that share the same score
  • zRank, zRevRank - Determine the index of a member in a sorted set
  • zRem, zDelete - Remove one or more members from a sorted set
  • zRemRangeByRank, zDeleteRangeByRank - Remove all members in a sorted set within the given indexes
  • zRemRangeByScore, zDeleteRangeByScore - Remove all members in a sorted set within the given scores
  • zRevRange - Return a range of members in a sorted set, by index, with scores ordered from high to low
  • zScore - Get the score associated with the given member in a sorted set
  • zUnion - Add multiple sorted sets and store the resulting sorted set in a new key
  • zScan - Scan a sorted set for members

zAdd

Description: Add one or more members to a sorted set or update its score if it already exists

Parameters

key score : double value: string

Return value

Long 1 if the element is added. 0 otherwise.

Example
$redis->zAdd('key', 1, 'val1');
$redis->zAdd('key', 0, 'val0');
$redis->zAdd('key', 5, 'val5');
$redis->zRange('key', 0, -1); // array(val0, val1, val5)

zCard, zSize

Description: Returns the cardinality of an ordered set.

Parameters

key

Return value

Long, the set's cardinality

Example
$redis->zAdd('key', 0, 'val0');
$redis->zAdd('key', 2, 'val2');
$redis->zAdd('key', 10, 'val10');
$redis->zSize('key'); /* 3 */

zCount

Description: Returns the number of elements of the sorted set stored at the specified key which have scores in the range [start,end]. Adding a parenthesis before start or end excludes it from the range. +inf and -inf are also valid limits.

Parameters

key start: string end: string

Return value

LONG the size of a corresponding zRangeByScore.

Example
$redis->zAdd('key', 0, 'val0');
$redis->zAdd('key', 2, 'val2');
$redis->zAdd('key', 10, 'val10');
$redis->zCount('key', 0, 3); /* 2, corresponding to array('val0', 'val2') */

zIncrBy

Description: Increments the score of a member from a sorted set by a given amount.

Parameters

key value: (double) value that will be added to the member's score member

Return value

DOUBLE the new value

Examples
$redis->delete('key');
$redis->zIncrBy('key', 2.5, 'member1'); /* key or member1 didn't exist, so member1's score is to 0 before the increment */
					  /* and now has the value 2.5  */
$redis->zIncrBy('key', 1, 'member1'); /* 3.5 */

zInter

Description: Creates an intersection of sorted sets given in second argument. The result of the union will be stored in the sorted set defined by the first argument.

The third optionnel argument defines weights to apply to the sorted sets in input. In this case, the weights will be multiplied by the score of each element in the sorted set before applying the aggregation. The forth argument defines the AGGREGATE option which specify how the results of the union are aggregated.

Parameters

keyOutput arrayZSetKeys arrayWeights aggregateFunction Either "SUM", "MIN", or "MAX": defines the behaviour to use on duplicate entries during the zInter.

Return value

LONG The number of values in the new sorted set.

Example
$redis->delete('k1');
$redis->delete('k2');
$redis->delete('k3');

$redis->delete('ko1');
$redis->delete('ko2');
$redis->delete('ko3');
$redis->delete('ko4');

$redis->zAdd('k1', 0, 'val0');
$redis->zAdd('k1', 1, 'val1');
$redis->zAdd('k1', 3, 'val3');

$redis->zAdd('k2', 2, 'val1');
$redis->zAdd('k2', 3, 'val3');

$redis->zInter('ko1', array('k1', 'k2')); 				/* 2, 'ko1' => array('val1', 'val3') */
$redis->zInter('ko2', array('k1', 'k2'), array(1, 1)); 	/* 2, 'ko2' => array('val1', 'val3') */

/* Weighted zInter */
$redis->zInter('ko3', array('k1', 'k2'), array(1, 5), 'min'); /* 2, 'ko3' => array('val1', 'val3') */
$redis->zInter('ko4', array('k1', 'k2'), array(1, 5), 'max'); /* 2, 'ko4' => array('val3', 'val1') */

zRange

Description: Returns a range of elements from the ordered set stored at the specified key, with values in the range [start, end].

Start and stop are interpreted as zero-based indices: 0 the first element, 1 the second ... -1 the last element, -2 the penultimate ...

Parameters

key start: long end: long withscores: bool = false

Return value

Array containing the values in specified range.

Example
$redis->zAdd('key1', 0, 'val0');
$redis->zAdd('key1', 2, 'val2');
$redis->zAdd('key1', 10, 'val10');
$redis->zRange('key1', 0, -1); /* array('val0', 'val2', 'val10') */

// with scores
$redis->zRange('key1', 0, -1, true); /* array('val0' => 0, 'val2' => 2, 'val10' => 10) */

zRangeByScore, zRevRangeByScore

Description: Returns the elements of the sorted set stored at the specified key which have scores in the range [start,end]. Adding a parenthesis before start or end excludes it from the range. +inf and -inf are also valid limits. zRevRangeByScore returns the same items in reverse order, when the start and end parameters are swapped.

Parameters

key start: string end: string options: array

Two options are available: withscores => TRUE, and limit => array($offset, $count)

Return value

Array containing the values in specified range.

Example
$redis->zAdd('key', 0, 'val0');
$redis->zAdd('key', 2, 'val2');
$redis->zAdd('key', 10, 'val10');
$redis->zRangeByScore('key', 0, 3); /* array('val0', 'val2') */
$redis->zRangeByScore('key', 0, 3, array('withscores' => TRUE); /* array('val0' => 0, 'val2' => 2) */
$redis->zRangeByScore('key', 0, 3, array('limit' => array(1, 1)); /* array('val2') */
$redis->zRangeByScore('key', 0, 3, array('withscores' => TRUE, 'limit' => array(1, 1)); /* array('val2' => 2) */

zRangeByLex

Description: Returns a lexigraphical range of members in a sorted set, assuming the members have the same score. The min and max values are required to start with '(' (exclusive), '[' (inclusive), or be exactly the values '-' (negative inf) or '+' (positive inf). The command must be called with either three or five arguments or will return FALSE.

Parameters

key: The ZSET you wish to run against min: The minimum alphanumeric value you wish to get max: The maximum alphanumeric value you wish to get offset: Optional argument if you wish to start somewhere other than the first element. limit: Optional argument if you wish to limit the number of elements returned.

Return value

Array containing the values in the specified range.

Example
foreach(Array('a','b','c','d','e','f','g') as $c)
    $redis->zAdd('key',0,$c);

$redis->zRangeByLex('key','-','[c') /* Array('a','b','c'); */
$redis->zRangeByLex('key','-','(c') /* Array('a','b') */
$redis->zRangeByLex('key','-','[c',1,2) /* Array('b','c') */

zRank, zRevRank

Description: Returns the rank of a given member in the specified sorted set, starting at 0 for the item with the smallest score. zRevRank starts at 0 for the item with the largest score.

Parameters

key member

Return value

Long, the item's score.

Example
$redis->delete('z');
$redis->zAdd('key', 1, 'one');
$redis->zAdd('key', 2, 'two');
$redis->zRank('key', 'one'); /* 0 */
$redis->zRank('key', 'two'); /* 1 */
$redis->zRevRank('key', 'one'); /* 1 */
$redis->zRevRank('key', 'two'); /* 0 */

zRem, zDelete

Description: Deletes a specified member from the ordered set.

Parameters

key member

Return value

LONG 1 on success, 0 on failure.

Example
$redis->zAdd('key', 0, 'val0');
$redis->zAdd('key', 2, 'val2');
$redis->zAdd('key', 10, 'val10');
$redis->zDelete('key', 'val2');
$redis->zRange('key', 0, -1); /* array('val0', 'val10') */

zRemRangeByRank, zDeleteRangeByRank

Description: Deletes the elements of the sorted set stored at the specified key which have rank in the range [start,end].

Parameters

key start: LONG end: LONG

Return value

LONG The number of values deleted from the sorted set

Example
$redis->zAdd('key', 1, 'one');
$redis->zAdd('key', 2, 'two');
$redis->zAdd('key', 3, 'three');
$redis->zRemRangeByRank('key', 0, 1); /* 2 */
$redis->zRange('key', 0, -1, array('withscores' => TRUE)); /* array('three' => 3) */

zRemRangeByScore, zDeleteRangeByScore

Description: Deletes the elements of the sorted set stored at the specified key which have scores in the range [start,end].

Parameters

key start: double or "+inf" or "-inf" string end: double or "+inf" or "-inf" string

Return value

LONG The number of values deleted from the sorted set

< 6377 em>Example
$redis->zAdd('key', 0, 'val0');
$redis->zAdd('key', 2, 'val2');
$redis->zAdd('key', 10, 'val10');
$redis->zRemRangeByScore('key', 0, 3); /* 2 */

zRevRange

Description: Returns the elements of the sorted set stored at the specified key in the range [start, end] in reverse order. start and stop are interpretated as zero-based indices: 0 the first element, 1 the second ... -1 the last element, -2 the penultimate ...

Parameters

key start: long end: long withscores: bool = false

Return value

Array containing the values in specified range.

Example
$redis->zAdd('key', 0, 'val0');
$redis->zAdd('key', 2, 'val2');
$redis->zAdd('key', 10, 'val10');
$redis->zRevRange('key', 0, -1); /* array('val10', 'val2', 'val0') */

// with scores
$redis->zRevRange('key', 0, -1, true); /* array('val10' => 10, 'val2' => 2, 'val0' => 0) */

zScore

Description: Returns the score of a given member in the specified sorted set.

Parameters

key member

Return value

Double

Example
$redis->zAdd('key', 2.5, 'val2');
$redis->zScore('key', 'val2'); /* 2.5 */

zUnion

Description: Creates an union of sorted sets given in second argument. The result of the union will be stored in the sorted set defined by the first argument.

The third optionnel argument defines weights to apply to the sorted sets in input. In this case, the weights will be multiplied by the score of each element in the sorted set before applying the aggregation. The forth argument defines the AGGREGATE option which specify how the results of the union are aggregated.

Parameters

keyOutput arrayZSetKeys arrayWeights aggregateFunction Either "SUM", "MIN", or "MAX": defines the behaviour to use on duplicate entries during the zUnion.

Return value

LONG The number of values in the new sorted set.

Example
$redis->delete('k1');
$redis->delete('k2');
$redis->delete('k3');
$redis->delete('ko1');
$redis->delete('ko2');
$redis->delete('ko3');

$redis->zAdd('k1', 0, 'val0');
$redis->zAdd('k1', 1, 'val1');

$redis->zAdd('k2', 2, 'val2');
$redis->zAdd('k2', 3, 'val3');

$redis->zUnion('ko1', array('k1', 'k2')); /* 4, 'ko1' => array('val0', 'val1', 'val2', 'val3') */

/* Weighted zUnion */
$redis->zUnion('ko2', array('k1', 'k2'), array(1, 1)); /* 4, 'ko2' => array('val0', 'val1', 'val2', 'val3') */
$redis->zUnion('ko3', array('k1', 'k2'), array(5, 1)); /* 4, 'ko3' => array('val0', 'val2', 'val3', 'val1') */

zScan

Description: Scan a sorted set for members, with optional pattern and count

Parameters

key: String, the set to scan iterator: Long (reference), initialized to NULL pattern: String (optional), the pattern to match count: How many keys to return per iteration (Redis might return a different number)

Return value

Array, boolean PHPRedis will return matching keys from Redis, or FALSE when iteration is complete

Example
$it = NULL;
$redis->setOption(Redis::OPT_SCAN, Redis::SCAN_RETRY);
while($arr_matches = $redis->zscan('zset', $it, '*pattern*')) {
    foreach($arr_matches as $str_mem => $f_score) {
        echo "Key: $str_mem, Score: $f_score\n";
    }
}

Pub/sub

  • psubscribe - Subscribe to channels by pattern
  • publish - Post a message to a channel
  • subscribe - Subscribe to channels
  • pubsub - Introspection into the pub/sub subsystem

psubscribe

Description: Subscribe to channels by pattern

Parameters

patterns: An array of patterns to match callback: Either a string or an array with an object and method. The callback will get four arguments ($redis, $pattern, $channel, $message) return value: Mixed. Any non-null return value in the callback will be returned to the caller.

Example
function psubscribe($redis, $pattern, $chan, $msg) {
	echo "Pattern: $pattern\n";
	echo "Channel: $chan\n";
	echo "Payload: $msg\n";
}
<
A851
/pre>

publish

Description: Publish messages to channels. Warning: this function will probably change in the future.

Parameters

channel: a channel to publish to messsage: string

Example
$redis->publish('chan-1', 'hello, world!'); // send message.

subscribe

Description: Subscribe to channels. Warning: this function will probably change in the future.

Parameters

channels: an array of channels to subscribe to callback: either a string or an array($instance, 'method_name'). The callback function receives 3 parameters: the redis instance, the channel name, and the message. return value: Mixed. Any non-null return value in the callback will be returned to the caller.

Example
function f($redis, $chan, $msg) {
	switch($chan) {
		case 'chan-1':
			...
			break;

		case 'chan-2':
			...
			break;

		case 'chan-2':
			...
			break;
	}
}

$redis->subscribe(array('chan-1', 'chan-2', 'chan-3'), 'f'); // subscribe to 3 chans

pubsub

Description: A command allowing you to get information on the Redis pub/sub system.

Parameters

keyword: String, which can be: "channels", "numsub", or "numpat" argument: Optional, variant. For the "channels" subcommand, you can pass a string pattern. For "numsub" an array of channel names.

Return value

CHANNELS: Returns an array where the members are the matching channels. NUMSUB: Returns a key/value array where the keys are channel names and values are their counts. NUMPAT: Integer return containing the number active pattern subscriptions

Example
$redis->pubsub("channels"); /*All channels */
$redis->pubsub("channels", "*pattern*"); /* Just channels matching your pattern */
$redis->pubsub("numsub", Array("chan1", "chan2")); /*Get subscriber counts for 'chan1' and 'chan2'*/
$redsi->pubsub("numpat"); /* Get the number of pattern subscribers */
```

## Transactions

1. [multi, exec, discard](#multi-exec-discard) - Enter and exit transactional mode
2. [watch, unwatch](#watch-unwatch) - Watches a key for modifications by another client.

### multi, exec, discard.
-----
_**Description**_: Enter and exit transactional mode.

##### *Parameters*
(optional) `Redis::MULTI` or `Redis::PIPELINE`. Defaults to `Redis::MULTI`. A `Redis::MULTI` block of commands runs as a single transaction; a `Redis::PIPELINE` block is simply transmitted faster to the server, but without any guarantee of atomicity. `discard` cancels a transaction.

##### *Return value*
`multi()` returns the Redis instance and enters multi-mode. Once in multi-mode, all subsequent method calls return the same object until `exec()` is called.

##### *Example*

$ret = $redis->multi() ->set('key1', 'val1') ->get('key1') ->set('key2', 'val2') ->get('key2') ->exec();

/* $ret == array( 0 => TRUE, 1 => 'val1', 2 => TRUE, 3 => 'val2'); */


### watch, unwatch
-----
_**Description**_: Watches a key for modifications by another client.

If the key is modified between `WATCH` and `EXEC`, the MULTI/EXEC transaction will fail (return `FALSE`). `unwatch` cancels all the watching of all keys by this client.

##### *Parameters*
*keys*: string for one key or array for a list of keys

##### *Example*

$redis->watch('x'); // or for a list of keys: $redis->watch(array('x','another key')); /* long code here during the execution of which other clients could well modify x / $ret = $redis->multi() ->incr('x') ->exec(); / $ret = FALSE if x has been modified between the call to WATCH and the call to EXEC. */




## Scripting

* [eval](#eval) - Evaluate a LUA script serverside
* [evalSha](#evalsha) - Evaluate a LUA script serverside, from the SHA1 hash of the script instead of the script itself
* [script](#script) - Execute the Redis SCRIPT command to perform various operations on the scripting subsystem
* [getLastError](#getlasterror) - The last error message (if any)
* [clearLastError](#clearlasterror) - Clear the last error message
* [_prefix](#_prefix) - A utility method to prefix the value with the prefix setting for phpredis
* [_unserialize](#_unserialize) - A utility method to unserialize data with whatever serializer is set up
* [_serialize](#_serialize) - A utility method to serialize data with whatever serializer is set up

### eval
-----
_**Description**_: Evaluate a LUA script serverside

##### *Parameters*
*script* string.
*args* array, optional.
*num_keys* int, optional.

##### *Return value*
Mixed.  What is returned depends on what the LUA script itself returns, which could be a scalar value (int/string), or an array.
Arrays that are returned can also contain other arrays, if that's how it was set up in your LUA script.  If there is an error
executing the LUA script, the getLastError() function can tell you the message that came back from Redis (e.g. compile error).

##### *Examples*

$redis->eval("return 1"); // Returns an integer: 1 $redis->eval("return {1,2,3}"); // Returns Array(1,2,3) $redis->del('mylist'); $redis->rpush('mylist','a'); $redis->rpush('mylist','b'); $redis->rpush('mylist','c'); // Nested response: Array(1,2,3,Array('a','b','c')); $redis->eval("return {1,2,3,redis.call('lrange','mylist',0,-1)}");


### evalSha
-----
_**Description**_: Evaluate a LUA script serverside, from the SHA1 hash of the script instead of the script itself.

In order to run this command Redis will have to have already loaded the script,
either by running it or via the SCRIPT LOAD command.

##### *Parameters*
*script_sha* string.  The sha1 encoded hash of the script you want to run.
*args* array, optional.  Arguments to pass to the LUA script.
*num_keys* int, optional.  The number of arguments that should go into the KEYS array, vs. the ARGV array when Redis spins the script

##### *Return value*
Mixed.  See EVAL

##### *Examples*

$script = 'return 1'; $sha = $redis->script('load', $script); $redis->evalSha($sha); // Returns 1


### script
-----
_**Description**_: Execute the Redis SCRIPT command to perform various operations on the scripting subsystem.

##### *Usage*

$redis->script('load', $script); $redis->script('flush'); $redis->script('kill'); $redis->script('exists', $script1, [$script2, $script3, ...]);


##### *Return value*
* SCRIPT LOAD will return the SHA1 hash of the passed script on success, and FALSE on failure.
* SCRIPT FLUSH should always return TRUE
* SCRIPT KILL will return true if a script was able to be killed and false if not
* SCRIPT EXISTS will return an array with TRUE or FALSE for each passed script

### client
-----
_**Description**_: Issue the CLIENT command with various arguments.

The Redis CLIENT command can be used in four ways.
* CLIENT LIST
* CLIENT GETNAME
* CLIENT SETNAME [name]
* CLIENT KILL [ip:port]

##### *Usage*

$redis->client('list'); // Get a list of clients $redis->client('getname'); // Get the name of the current connection $redis->client('setname', 'somename'); // Set the name of the current connection $redis->client('kill', ip:port); // Kill the process at ip:port


##### *Return value*
This will vary depending on which client command was executed.

* CLIENT LIST will return an array of arrays with client information.
* CLIENT GETNAME will return the client name or false if none has been set
* CLIENT SETNAME will return true if it can be set and false if not
* CLIENT KILL will return true if the client can be killed, and false if not

Note:  phpredis will attempt to reconnect so you can actually kill your own connection
but may not notice losing it!
### getLastError
-----
_**Description**_: The last error message (if any)

##### *Parameters*
*none*

##### *Return value*
A string with the last returned script based error message, or NULL if there is no error

##### *Examples*

$redis->eval('this-is-not-lua'); $err = $redis->getLastError(); // "ERR Error compiling script (new function): user_script:1: '=' expected near '-'"


### clearLastError
-----
_**Description**_: Clear the last error message

##### *Parameters*
*none*

##### *Return value*
*BOOL* TRUE

##### *Examples*

$redis->set('x', 'a'); $redis->incr('x'); $err = $redis->getLastError(); // "ERR value is not an integer or out of range" $redis->clearLastError(); $err = $redis->getLastError(); // NULL


### _prefix
-----
_**Description**_: A utility method to prefix the value with the prefix setting for phpredis.

##### *Parameters*
*value* string.  The value you wish to prefix

##### *Return value*
If a prefix is set up, the value now prefixed.  If there is no prefix, the value will be returned unchanged.

##### *Examples*

$redis->setOption(Redis::OPT_PREFIX, 'my-prefix:'); $redis->_prefix('my-value'); // Will return 'my-prefix:my-value'


### _serialize
-----
_**Description**_: A utility method to serialize values manually.

This method allows you to serialize a value with whatever serializer is configured, manually.
This can be useful for serialization/unserialization of data going in and out of EVAL commands
as phpredis can't automatically do this itself.  Note that if no serializer is set, phpredis
will change Array values to 'Array', and Objects to 'Object'.

##### *Parameters*
*value*:  Mixed.  The value to be serialized

##### *Examples*

$redis->setOption(Redis::OPT_SERIALIZER, Redis::SERIALIZER_NONE); $redis->_serialize("foo"); // returns "foo" $redis->_serialize(Array()); // Returns "Array" $redis->_serialize(new stdClass()); // Returns "Object"

$redis->setOption(Redis::OPT_SERIALIZER, Redis::SERIALIZER_PHP); $redis->_serialize("foo"); // Returns 's:3:"foo";'


### _unserialize
-----
_**Description**_: A utility method to unserialize data with whatever serializer is set up.

If there is no serializer set, the value will be returned unchanged.  If there is a serializer set up,
and the data passed in is malformed, an exception will be thrown. This can be useful if phpredis is
serializing values, and you return something from redis in a LUA script that is serialized.

##### *Parameters*
*value* string.  The value to be unserialized

##### *Examples*

$redis->setOption(Redis::OPT_SERIALIZER, Redis::SERIALIZER_PHP); $redis->_unserialize('a:3:{i:0;i:1;i:1;i:2;i:2;i:3;}'); // Will return Array(1,2,3)




## Introspection

### IsConnected
-----
_**Description**_:  A method to determine if a phpredis object thinks it's connected to a server

##### *Parameters*
None

##### *Return value*
*Boolean* Returns TRUE if phpredis thinks it's connected and FALSE if not

### GetHost
-----
_**Description**_:  Retreive our host or unix socket that we're connected to

##### *Parameters*
None

##### *Return value*
*Mixed* The host or unix socket we're connected to or FALSE if we're not connected


### GetPort
-----
_**Description**_:  Get the port we're connected to

##### *Parameters*
None

##### *Return value*
*Mixed* Returns the port we're connected to or FALSE if we're not connected

### getDBNum
-----
_**Description**_:  Get the database number phpredis is pointed to

##### *Parameters*
None

##### *Return value*
*Mixed* Returns the database number (LONG) phpredis thinks it's pointing to or FALSE if we're not connected

### GetTimeout
-----
_**Description**_:  Get the (write) timeout in use for phpredis

##### *Parameters*
None

##### *Return value*
*Mixed* The timeout (DOUBLE) specified in our connect call or FALSE if we're not connected

### GetReadTimeout
_**Description**_:  Get the read timeout specified to phpredis or FALSE if we're not connected

##### *Parameters*
None

##### *Return value*
*Mixed*  Returns the read timeout (which can be set using setOption and Redis::OPT_READ_TIMEOUT) or FALSE if we're not connected

### GetPersistentID
-----
_**Description**_:  Gets the persistent ID that phpredis is using

##### *Parameters*
None

##### *Return value*
*Mixed* Returns the persistent id phpredis is using (which will only be set if connected with pconnect), NULL if we're not
using a persistent ID, and FALSE if we're not connected

### GetAuth
-----
_**Description**_:  Get the password used to authenticate the phpredis connection

### *Parameters*
None

### *Return value*
*Mixed*  Returns the password used to authenticate a phpredis session or NULL if none was used, and FALSE if we're not connected

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