[Routing] fix memoryleak when loading compiled routes

Author: nicolas-grekas

Router.php

@@ -97,6 +97,8 @@ class Router implements RouterInterface, RequestMatcherInterface
      */
     private $expressionLanguageProviders = [];
 
+    private static $cache = [];
+
     /**
      * @param LoaderInterface $loader   A LoaderInterface instance
      * @param mixed           $resource The main resource to load
@@ -325,7 +327,7 @@ function (ConfigCacheInterface $cache) {
         );
 
         if ($compiled) {
-            return $this->matcher = new $this->options['matcher_class'](require $cache->getPath(), $this->context);
+            return $this->matcher = new $this->options['matcher_class'](self::getCompiledRoutes($cache->getPath()), $this->context);
         }
 
         if (!class_exists($this->options['matcher_cache_class'], false)) {
@@ -369,7 +371,7 @@ function (ConfigCacheInterface $cache) {
             );
 
             if ($compiled) {
-                $this->generator = new $this->options['generator_class'](require $cache->getPath(), $this->context, $this->logger, $this->defaultLocale);
+                $this->generator = new $this->options['generator_class'](self::getCompiledRoutes($cache->getPath()), $this->context, $this->logger, $this->defaultLocale);
             } else {
                 if (!class_exists($this->options['generator_cache_class'], false)) {
                     require_once $cache->getPath();
@@ -442,4 +444,21 @@ private function checkDeprecatedOption($key)
                 @trigger_error(sprintf('Option "%s" given to router %s is deprecated since Symfony 4.3.', $key, static::class), E_USER_DEPRECATED);
         }
     }
+
+    private static function getCompiledRoutes(string $path): array
+    {
+        if ([] === self::$cache && \function_exists('opcache_invalidate') && filter_var(ini_get('opcache.enable'), FILTER_VALIDATE_BOOLEAN) && (!\in_array(\PHP_SAPI, ['cli', 'phpdbg'], true) || filter_var(ini_get('opcache.enable_cli'), FILTER_VALIDATE_BOOLEAN))) {
+            self::$cache = null;
+        }
+
+        if (null === self::$cache) {
+            return require $path;
+        }
+
+        if (isset(self::$cache[$path])) {
+            return self::$cache[$path];
+        }
+
+        return self::$cache[$path] = require $path;
+    }
 }