[Console] fixed BC issue with static closures

Author: Andy Raines

src/Symfony/Component/Console/Command/Command.php

@@ -283,7 +283,15 @@ public function setCode($code)
         if (PHP_VERSION_ID >= 50400 && $code instanceof \Closure) {
             $r = new \ReflectionFunction($code);
             if (null === $r->getClosureThis()) {
-                $code = \Closure::bind($code, $this);
+                if (PHP_VERSION_ID < 70000) {
+                    // Bug in PHP5: https://bugs.php.net/bug.php?id=64761
+                    // This means that we cannot bind static closures and therefore we must
+                    // ignore any errors here.  There is no way to test if the closure is
+                    // bindable.
+                    $code = @\Closure::bind($code, $this);
+                } else {
+                    $code = \Closure::bind($code, $this);
+                }
             }
         }
 

src/Symfony/Component/Console/Tests/Command/CommandTest.php

@@ -335,6 +335,29 @@ public function testSetCodeBindToClosure($previouslyBound, $expected)
         $this->assertEquals('interact called'.PHP_EOL.$expected.PHP_EOL, $tester->getDisplay());
     }
 
+    public function testSetCodeWithStaticClosure()
+    {
+        $command = new \TestCommand();
+        $command->setCode(self::createClosure());
+        $tester = new CommandTester($command);
+        $tester->execute(array());
+
+        if (PHP_VERSION_ID < 70000) {
+            // Cannot bind static closures in PHP 5
+            $this->assertEquals('interact called'.PHP_EOL.'not bound'.PHP_EOL, $tester->getDisplay());
+        } else {
+            // Can bind static closures in PHP 7
+            $this->assertEquals('interact called'.PHP_EOL.'bound'.PHP_EOL, $tester->getDisplay());
+        }
+    }
+
+    private static function createClosure()
+    {
+        return function (InputInterface $input, OutputInterface $output) {
+            $output->writeln(isset($this) ? 'bound' : 'not bound');
+        };
+    }
+
     public function testSetCodeWithNonClosureCallable()
     {
         $command = new \TestCommand();