[DependencyInjection] Forbid container cloning

Author: jakzal

Container.php

@@ -604,4 +604,8 @@ public static function underscore($id)
     {
         return strtolower(preg_replace(array('/([A-Z]+)([A-Z][a-z])/', '/([a-z\d])([A-Z])/'), array('\\1_\\2', '\\1_\\2'), strtr($id, '_', '.')));
     }
+
+    private function __clone()
+    {
+    }
 }

Tests/ContainerTest.php

@@ -662,6 +662,16 @@ public function testAlias()
         $this->assertTrue($c->has('alias'));
         $this->assertSame($c->get('alias'), $c->get('bar'));
     }
+
+    public function testThatCloningIsNotSupported()
+    {
+        $class = new \ReflectionClass('Symfony\Component\DependencyInjection\Container');
+        $clone = $class->getMethod('__clone');
+        if (PHP_VERSION_ID >= 540000) {
+            $this->assertFalse($class->isCloneable());
+        }
+        $this->assertTrue($clone->isPrivate());
+    }
 }
 
 class ProjectServiceContainer extends Container