Merge branch '4.3' into 4.4

* 4.3:
  fixed CS
  fixed CS
  fixed CS
  Do not log or call the proxy function when the locale is the same
  Added missing required dependencies on psr/cache and psr/container in symfony/cache-contracts and symfony/service-contracts respectively.
  [HttpClient] fix closing debug stream prematurely
  [Mailer] made code more robust
  Restore compatibility with php 5.5
  fixed sender/recipients in SMTP Envelope
  collect called listeners information only once
  [HttpKernel] Remove TestEventDispatcher.

Author: fabpot

ClassExistsMock.php

@@ -30,17 +30,17 @@ public static function withMockedClasses(array $classes)
 
     public static function class_exists($name, $autoload = true)
     {
-        return (bool) (self::$classes[ltrim($name, '\\')] ?? \class_exists($name, $autoload));
+        return (bool) (self::$classes[ltrim($name, '\\')] ?? class_exists($name, $autoload));
     }
 
     public static function interface_exists($name, $autoload = true)
     {
-        return (bool) (self::$classes[ltrim($name, '\\')] ?? \interface_exists($name, $autoload));
+        return (bool) (self::$classes[ltrim($name, '\\')] ?? interface_exists($name, $autoload));
     }
 
     public static function trait_exists($name, $autoload = true)
     {
-        return (bool) (self::$classes[ltrim($name, '\\')] ?? \trait_exists($name, $autoload));
+        return (bool) (self::$classes[ltrim($name, '\\')] ?? trait_exists($name, $autoload));
     }
 
     public static function register($class)

DeprecationErrorHandler/Configuration.php

@@ -90,9 +90,12 @@ public function isEnabled()
      */
     public function tolerates(array $deprecations)
     {
-        $deprecationCounts = array_filter($deprecations, function ($key) {
-            return false !== strpos($key, 'Count') && false === strpos($key, 'legacy');
-        }, ARRAY_FILTER_USE_KEY);
+        $deprecationCounts = [];
+        foreach ($deprecations as $key => $deprecation) {
+            if (false !== strpos($key, 'Count') && false === strpos($key, 'legacy')) {
+                $deprecationCounts[$key] = $deprecation;
+            }
+        }
 
         if (array_sum($deprecationCounts) > $this->thresholds['total']) {
             return false;

Legacy/SymfonyTestsListenerTrait.php

@@ -53,7 +53,7 @@ public function __construct(array $mockedNamespaces = array())
             Blacklist::$blacklistedClassNames['\Symfony\Bridge\PhpUnit\Legacy\SymfonyTestsListenerTrait'] = 2;
         }
 
-        $enableDebugClassLoader = \class_exists('Symfony\Component\Debug\DebugClassLoader');
+        $enableDebugClassLoader = class_exists('Symfony\Component\Debug\DebugClassLoader');
 
         foreach ($mockedNamespaces as $type => $namespaces) {
             if (!\is_array($namespaces)) {