UPGRADE FROM 3.1 to 3.2

BrowserKit

Client HTTP user agent has been changed to 'Symfony BrowserKit' (was 'Symfony2 BrowserKit' before).

FrameworkBundle

The doctrine/annotations dependency has been removed; require it via composer require doctrine/annotations if you are using annotations in your project
The symfony/security-core and symfony/security-csrf dependencies have been removed; require them via composer require symfony/security-core symfony/security-csrf if you depend on them and don't already depend on symfony/symfony
The symfony/templating dependency has been removed; require it via composer require symfony/templating if you depend on it and don't already depend on symfony/symfony
The symfony/translation dependency has been removed; require it via composer require symfony/translation if you depend on it and don't already depend on symfony/symfony
The symfony/asset dependency has been removed; require it via composer require symfony/asset if you depend on it and don't already depend on symfony/symfony
The Resources/public/images/* files have been removed.
The Resources/public/css/*.css files have been removed (they are now inlined in TwigBundle).

Console

Setting unknown style options is deprecated and will throw an exception in Symfony 4.0.

DependencyInjection

Calling get() on a ContainerBuilder instance before compiling the container is deprecated and will throw an exception in Symfony 4.0.

ExpressionLanguage

Passing a ParserCacheInterface instance to the ExpressionLanguage has been deprecated and will not be supported in Symfony 4.0. You should use the CacheItemPoolInterface interface instead.

Form

Calling isValid() on a Form instance before submitting it is deprecated and will throw an exception in Symfony 4.0.

Before:
```
if ($form->isValid()) {
    // ...
}
```
After:
```
if ($form->isSubmitted() && $form->isValid()) {
    // ...
}
```

FrameworkBundle

The service serializer.mapping.cache.doctrine.apc is deprecated. APCu should now be automatically used when available.

HttpKernel

DataCollector::varToString() is deprecated and will be removed in Symfony 4.0. Use the cloneVar() method instead.
Surrogate name in a Surrogate-Capability HTTP request header has been changed to 'symfony'.

Before:
```
Surrogate-Capability: symfony2="ESI/1.0"
```
After:
```
Surrogate-Capability: symfony="ESI/1.0"
```

HttpFoundation

Extending the following methods of Response is deprecated (these methods will be final in 4.0):
- setDate/getDate
- setExpires/getExpires
- setLastModified/getLastModified
- setProtocolVersion/getProtocolVersion
- setStatusCode/getStatusCode
- setCharset/getCharset
- setPrivate/setPublic
- getAge
- getMaxAge/setMaxAge
- setSharedMaxAge
- getTtl/setTtl
- setClientTtl
- getEtag/setEtag
- hasVary/getVary/setVary
- isInvalid/isSuccessful/isRedirection/isClientError/isServerError
- isOk/isForbidden/isNotFound/isRedirect/isEmpty

Serializer

Method AbstractNormalizer::instantiateObject() will have a 6th $format = null argument in Symfony 4.0. Not defining it when overriding the method is deprecated.

TwigBridge

Deprecated the possibility to inject the Form Twig Renderer into the form extension. Inject it into the TwigRendererEngine instead.

Validator

Tests\Constraints\AbstractConstraintValidatorTest has been deprecated in favor of Test\ConstraintValidatorTestCase.

Before:

// ...
use Symfony\Component\Validator\Tests\Constraints\AbstractConstraintValidatorTest;

class MyCustomValidatorTest extends AbstractConstraintValidatorTest
{
    // ...
}

After:

// ...
use Symfony\Component\Validator\Test\ConstraintValidatorTestCase;

class MyCustomValidatorTest extends ConstraintValidatorTestCase
{
    // ...
}

Setting the strict option of the Choice Constraint to false has been deprecated and the option will be changed to true as of 4.0.

// ...
use Symfony\Component\Validator\Constraints as Assert;

class MyEntity
{
    /**
     * @Assert\Choice(choices={"MR", "MRS"}, strict=true)
     */
    private $salutation;
}

Yaml

Support for silently ignoring duplicate mapping keys in YAML has been deprecated and will lead to a ParseException in Symfony 4.0.
Mappings with a colon (:) that is not followed by a whitespace are deprecated and will lead to a ParseException in Symfony 4.0 (e.g. foo:bar must be foo: bar).

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