bug symfony#17358 [ClassLoader] Use symfony/polyfill-apcu (nicolas-grekas)

This PR was merged into the 2.3 branch.

Discussion
----------

[ClassLoader] Use symfony/polyfill-apcu

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

Fixes APC usage on PHP 7 or when APCu bc-layer is disabled

Commits
-------

623595f [ClassLoader] Use symfony/polyfill-apcu

Author: Tobion

.travis.yml

@@ -38,8 +38,9 @@ before_install:
     - echo session.gc_probability = 0 >> $INI_FILE
     - if [[ $TRAVIS_PHP_VERSION = 5.* ]]; then echo extension = mongo.so >> $INI_FILE; fi;
     - if [[ $TRAVIS_PHP_VERSION = 5.* ]]; then echo extension = memcache.so >> $INI_FILE; fi;
-    - if [[ $TRAVIS_PHP_VERSION = 5.* ]]; then (echo yes | pecl install -f apcu-4.0.10 && echo apc.enable_cli = 1 >> $INI_FILE) || echo "Let's continue without apcu extension"; fi;
-    - if [[ $TRAVIS_PHP_VERSION = 5.* ]]; then pecl install -f memcached-2.1.0 || echo "Let's continue without memcached extension"; fi;
+    - if [[ $TRAVIS_PHP_VERSION = 5.* ]]; then (echo yes | pecl install -f apcu-4.0.10 && echo apc.enable_cli = 1 >> $INI_FILE); fi;
+    - if [[ $TRAVIS_PHP_VERSION = 7.* ]]; then (echo yes | pecl install -f apcu-5.1.2 && echo apc.enable_cli = 1 >> $INI_FILE); fi;
+    - if [[ $TRAVIS_PHP_VERSION = 5.* ]]; then pecl install -f memcached-2.1.0; fi;
     - if [[ $TRAVIS_PHP_VERSION != hhvm ]]; then echo extension = ldap.so >> $INI_FILE; fi;
     - if [[ $TRAVIS_PHP_VERSION != hhvm ]]; then phpenv config-rm xdebug.ini; fi;
     - if [[ $TRAVIS_REPO_SLUG = symfony/symfony ]]; then cp .composer-auth.json ~/.composer/auth.json; fi;

composer.json

@@ -19,6 +19,7 @@
         "php": ">=5.3.3",
         "doctrine/common": "~2.4",
         "paragonie/random_compat": "~1.0",
+        "symfony/polyfill-apcu": "~1.0,>=1.0.2",
         "twig/twig": "~1.23|~2.0",
         "psr/log": "~1.0"
     },

src/Symfony/Component/ClassLoader/ApcClassLoader.php

@@ -67,8 +67,8 @@ class ApcClassLoader
      */
     public function __construct($prefix, $decorated)
     {
-        if (!extension_loaded('apc')) {
-            throw new \RuntimeException('Unable to use ApcClassLoader as APC is not enabled.');
+        if (!function_exists('apcu_fetch')) {
+            throw new \RuntimeException('Unable to use ApcClassLoader as APC is not installed.');
         }
 
         if (!method_exists($decorated, 'findFile')) {
@@ -122,8 +122,8 @@ public function loadClass($class)
      */
     public function findFile($class)
     {
-        if (false === $file = apc_fetch($this->prefix.$class)) {
-            apc_store($this->prefix.$class, $file = $this->decorated->findFile($class));
+        if (false === $file = apcu_fetch($this->prefix.$class)) {
+            apcu_store($this->prefix.$class, $file = $this->decorated->findFile($class));
         }
 
         return $file;

src/Symfony/Component/ClassLoader/composer.json

@@ -17,7 +17,8 @@
     ],
     "minimum-stability": "dev",
     "require": {
-        "php": ">=5.3.3"
+        "php": ">=5.3.3",
+        "symfony/polyfill-apcu": "~1.0,>=1.0.2"
     },
     "require-dev": {
         "symfony/finder": "~2.0,>=2.0.5"