In PHP you can compare two variables using these two methods.
- Loose comparison ('==' or '!=')
- Strict comparison ('===' or !==)
PHP has a feature called “type juggling”, or “type coercion”. This means that during the comparison of variables of different types, PHP will first convert them to a common, comparable type.
Loose comparison
$var1 = 7
$var2 = “7”
if ($example_int == $example_str) {
echo("PHP can compare ints and strings.")
}
Strict Comparison
$var1 = 7
$var2 = “7”
if ($example_int === $example_str) {
echo("This will return error.")
}
'123' == 123 # true
'123a' == 123 # true
'' == 0 # true
0 == false # true
false == NULL # true
NULL == '' # true
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code>var_dump('0010e2' == '1e3'); # true
var_dump('0xABCdef' == ' 0xABCdef'); # true
var_dump('0xABCdef' == ' 0xABCdef'); # true
var_dump('0x01' == 1) # true
var_dump('0x1234Ab' == '1193131');
If the hash starts with 0 or 0e and only followed by numbers, then PHP will treat the hash as float.
var_dump(md5('240610708') == md5('QNKCDZO')); # bool(true)
var_dump(md5('aabg7XSs') == md5('aabC9RqS')); # bool(true)
var_dump(sha1('aaroZmOk') == sha1('aaK1STfY')); # bool(true)
var_dump(sha1('aaO8zKZF') == sha1('aa3OFF9m')); # bool(true)