UPGRADE FROM 2.4 to 2.5

Routing

Added a new optional parameter $requiredSchemes to Symfony\Component\Routing\Generator\UrlGenerator::doGenerate()

Form

The method FormInterface::getErrors() now returns an instance of Symfony\Component\Form\FormErrorIterator instead of an array. This object is traversable, countable and supports array access. However, you can not pass it to any of PHP's array_* functions anymore. You should use iterator_to_array() in those cases where you did.

Before:
```
$errors = array_map($callback, $form->getErrors());
```
After:
```
$errors = array_map($callback, iterator_to_array($form->getErrors()));
```
The method FormInterface::getErrors() now has two additional, optional parameters. Make sure to add these parameters to the method signatures of your implementations of that interface.

Before:
```
public function getErrors()
{
```
After:
```
public function getErrors($deep = false, $flatten = true)
{
```

PropertyAccess

The methods isReadable() and isWritable() were added to PropertyAccessorInterface. If you implemented this interface in your own code, you should add these two methods.

The methods getValue() and setValue() now throw an NoSuchIndexException instead of a NoSuchPropertyException when an index is accessed on an object that does not implement ArrayAccess. If you catch this exception in your code, you should adapt the catch statement:

Before:

$object = new \stdClass();

try {
    $propertyAccessor->getValue($object, '[index]');
    $propertyAccessor->setValue($object, '[index]', 'New value');
} catch (NoSuchPropertyException $e) {
    // ...
}

After:

$object = new \stdClass();

try {
    $propertyAccessor->getValue($object, '[index]');
    $propertyAccessor->setValue($object, '[index]', 'New value');
} catch (NoSuchIndexException $e) {
    // ...
}

A NoSuchPropertyException is still thrown when a non-existing property is accessed on an object or an array.

Validator

EmailValidator has changed to allow non-strict and strict email validation

Before:

Email validation was done with php's filter_var()

After:

Default email validation is now done via a simple regex which may cause invalid emails (not RFC compilant) to be valid. This is the default behaviour.

Strict email validation has to be explicitly activated in the configuration file by adding
```
framework:
   //...
   validation:
       strict_email: true
   //...
```
Also you have to add to your composer.json:
```
"egulias/email-validator": "1.1.*"
```
ClassMetadata::getGroupSequence() now returns GroupSequence instances instead of an array. The sequence implements \Traversable, \ArrayAccess and \Countable, so in most cases you should be fine. If you however use the sequence with PHP's array_*() functions, you should cast it to an array first using iterator_to_array():

Before:
```
$sequence = $metadata->getGroupSequence();
$result = array_map($callback, $sequence);
```
After:
```
$sequence = iterator_to_array($metadata->getGroupSequence());
$result = array_map($callback, $sequence);
```
The array type hint in ClassMetadata::setGroupSequence() was removed. If you overwrite this method, make sure to remove the type hint as well. The method should now accept GroupSequence instances just as well as arrays.

Before:
```
public function setGroupSequence(array $groups)
{
    // ...
}
```
After:
```
public function setGroupSequence($groupSequence)
{
    // ...
}
```
The validation engine in Symfony\Component\Validator\Validator was replaced by a new one in Symfony\Component\Validator\Validator\RecursiveValidator. With that change, several classes were deprecated that will be removed in Symfony 3.0. Also, the API of the validator was slightly changed. More details about that can be found in UPGRADE-3.0.

You can choose the desired API via the new "api" entry in app/config/config.yml:
```
framework:
    validation:
        enabled: true
        api: auto
```
When running PHP 5.3.9 or higher, Symfony will then use an implementation that supports both the old API and the new one:
```
framework:
    validation:
        enabled: true
        api: 2.5-bc
```
When running PHP lower than 5.3.9, that compatibility layer is not supported. On those versions, the old implementation will be used instead:
```
framework:
    validation:
        enabled: true
        api: 2.4
```
If you develop a new application that doesn't rely on the old API, you can also set the API to 2.5. In that case, the backwards compatibility layer will not be activated:
```
framework:
    validation:
        enabled: true
        api: 2.5
```
When using the validator outside of the Symfony full-stack framework, the desired API can be selected using setApiVersion() on the validator builder:
```
// Previous implementation
$validator = Validation::createValidatorBuilder()
    ->setApiVersion(Validation::API_VERSION_2_4)
    ->getValidator();

// New implementation with backwards compatibility support
$validator = Validation::createValidatorBuilder()
    ->setApiVersion(Validation::API_VERSION_2_5_BC)
    ->getValidator();

// New implementation without backwards compatibility support
$validator = Validation::createValidatorBuilder()
    ->setApiVersion(Validation::API_VERSION_2_5)
    ->getValidator();
```

Yaml Component

The way Yaml handles duplicate keys in an array was changed from rewrite with the last element behavior to ignoring all the elements with the same key after the first one.

Example:
```
parentElement:
    firstChild: foo
    secondChild: 123
    firstChild: bar
```
Before:

This would be parsed in an array like this: ["parentElement" => ["firstChild" => "bar", "secondChild" => 123]]

After:

The first value is used: ["parentElement" => ["firstChild" => "foo", "secondChild" => 123]]

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