This PR was squashed before being merged into the 2.7 branch (closes #24342).

Discussion
----------

removed useless PHPDoc

| Q             | A
| ------------- | ---
| Branch?       | 2.7
| Bug fix?      | no
| New feature?  | no <!-- don't forget updating src/**/CHANGELOG.md files -->
| BC breaks?    | no
| Deprecations? | no <!-- don't forget updating UPGRADE-*.md files -->
| Tests pass?   | yes
| Fixed tickets |
| License       | MIT
| Doc PR        | n/a

Commits
-------

5ee9043d8b removed useless PHPDoc

[CS][2.7] yoda_style, no_unneeded_curly_braces, no_unneeded_final_method, semicolon_after_instruction

* 2.3:
  [ci] Get ICU/intl from github instead of nebm.ist.utl.pt/~glopes
  [Debug] Fix handling of php7 throwables
  [Process] remove dead code
  [ClassLoader] Fix storing not-found classes in APC cache
  [Form] cs fixes in date types

* 2.3:
  [ci] use hirak/prestissimo
  [Filesystem] Fix transient tests
  [HttpFoundation] Avoid warnings when checking malicious IPs
  [HttpFoundation] Set the Content-Range header if the requested Range is unsatisfied

Conflicts:
	appveyor.yml
	src/Symfony/Component/Filesystem/Tests/FilesystemTest.php

* 2.3:
  Updated all the README files
  [TwigBundle] Fix failing test on appveyor
  [FrameworkBundle] Fix a regression in handling absolute and namespaced template paths
  Allow to normalize \Traversable
  Remove _path from query parameters when fragment is a subrequest and request attributes are already set Added tests for _path removal in FragmentListener
  Simplified everything
  Added a test
  Fixed the problem in an easier way
  Fixed a syntax issue
  Improved the error message when a template is not found
  [CodingStandards] Conformed to coding standards
  [TwigBundle] fixed Include file locations in "Template could not be found" exception

* 2.3:
  fixed undefined variable
  Fixed the phpDoc of UserInterface
  fixed APCu dep version
  Added support for the `0.0.0.0/0` trusted proxy
  [DoctrineBridge][Validator] >= 2.3 Pass association instead of ID as argument
  [HttpKernel] Lookup the response even if the lock was released after 2 seconds

* 2.3:
  [ClassLoader] Use symfony/polyfill-apcu

* 2.3:
  Fixed correct class name in thrown exception
  Add gc_mem_caches() call for PHP7 after itoken_get_all() as new memory manager will not release small buckets to OS automatically
  Removed a duplicated test in CardSchemeValidatorTest
  Fix perf and mem issue when using token_get_all
  [SecurityBundle] fix SecureRandom service constructor args
  Normalize params only when used.

bug #17377 Fix performance (PHP5) and memory (PHP7) issues when using token_get_all (nicolas-grekas, peteward)

This PR was merged into the 2.3 branch.

Discussion
----------

Fix performance (PHP5) and memory (PHP7) issues when using token_get_all

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #16868
| License       | MIT
| Doc PR        | -

Although it's not the case anymore on PHP 7, on PHP 5, `is_array` checks are much slower than `isset` checks.

Also from @peteward in #17384:
>  New PHP7 memory manager will not release small buckets to OS automatically in cases exposed by `token_get_all()`. This function call addition specifically for PHP7 will reclaim this memory to keep the footprint down of long processe

> See above ticket and suggested actions by PHP internals team for long-running tasks (https://bugs.php.net/70098) - I think `cache:clear/warmup` on a heavy app justifies this.

> We're running on cloud-based hosting platforms under memory limitations (Platform.sh). When memory is exceeded we're into swap and the cache clearing process goes from seconds to minutes for the initial deployment, which really slows our development workflow and also causes holding page delays.

Commits
-------

e555aad Add gc_mem_caches() call for PHP7 after itoken_get_all() as new memory manager will not release small buckets to OS automatically
d1f72d8 Fix perf and mem issue when using token_get_all

* 2.3:
  [ClassLoader] Use symfony/polyfill-apcu
  [HttpFoundation][Cookie] Cookie DateTimeInterface fix
  bumped Symfony version to 2.3.38
  updated VERSION for 2.3.37
  update CONTRIBUTORS for 2.3.37
  updated CHANGELOG for 2.3.37

Conflicts:
	.travis.yml
	src/Symfony/Component/ClassLoader/composer.json
	src/Symfony/Component/HttpKernel/Kernel.php

Add gc_mem_caches() call for PHP7 after itoken_get_all() as new memory manager will not release small buckets to OS automatically

* 2.3:
  Update copyright year
  [2.3] Static Code Analysis for Components