minor symfony#12529 [2.3] Remove possible call_user_func() (nicolas-grekas)

This PR was merged into the 2.3 branch.

Discussion
----------

[2.3] Remove possible call_user_func()

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

Merging this in 2.3 enhances performance a bit, but more importantly will ease future merges into 3.0.

Commits
-------

fad7aba [2.3] Remove possible call_user_func()

Author: fabpot

src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/AppKernel.php

@@ -105,7 +105,8 @@ public function serialize()
 
     public function unserialize($str)
     {
-        call_user_func_array(array($this, '__construct'), unserialize($str));
+        $a = unserialize($str);
+        $this->__construct($a[0], $a[1], $a[2], $a[3]);
     }
 
     protected function getKernelParameters()

src/Symfony/Bundle/SecurityBundle/Tests/Functional/app/AppKernel.php

@@ -105,7 +105,8 @@ public function serialize()
 
     public function unserialize($str)
     {
-        call_user_func_array(array($this, '__construct'), unserialize($str));
+        $a = unserialize($str);
+        $this->__construct($a[0], $a[1], $a[2], $a[3]);
     }
 
     protected function getKernelParameters()

src/Symfony/Component/Config/Definition/Builder/ExprBuilder.php

@@ -225,8 +225,10 @@ public static function buildExpressions(array $expressions)
     {
         foreach ($expressions as $k => $expr) {
             if ($expr instanceof ExprBuilder) {
-                $expressions[$k] = function ($v) use ($expr) {
-                    return call_user_func($expr->ifPart, $v) ? call_user_func($expr->thenPart, $v) : $v;
+                $if = $expr->ifPart;
+                $then = $expr->thenPart;
+                $expressions[$k] = function ($v) use ($if, $then) {
+                    return $if($v) ? $then($v) : $v;
                 };
             }
         }

src/Symfony/Component/Config/Definition/VariableNode.php

@@ -49,7 +49,9 @@ public function hasDefaultValue()
      */
     public function getDefaultValue()
     {
-        return $this->defaultValue instanceof \Closure ? call_user_func($this->defaultValue) : $this->defaultValue;
+        $v = $this->defaultValue;
+
+        return $v instanceof \Closure ? $v() : $v;
     }
 
     /**

src/Symfony/Component/Config/Exception/FileLoaderImportCircularReferenceException.php

@@ -22,6 +22,6 @@ public function __construct(array $resources, $code = null, $previous = null)
     {
         $message = sprintf('Circular reference detected in "%s" ("%s" > "%s").', $this->varToString($resources[0]), implode('" > "', $resources), $resources[0]);
 
-        call_user_func('Exception::__construct', $message, $code, $previous);
+        \Exception::__construct($message, $code, $previous);
     }
 }

src/Symfony/Component/Finder/Shell/Command.php

@@ -248,14 +248,14 @@ public function getErrorHandler()
      */
     public function execute()
     {
-        if (null === $this->errorHandler) {
+        if (null === $errorHandler = $this->errorHandler) {
             exec($this->join(), $output);
         } else {
             $process = proc_open($this->join(), array(0 => array('pipe', 'r'), 1 => array('pipe', 'w'), 2 => array('pipe', 'w')), $pipes);
             $output = preg_split('~(\r\n|\r|\n)~', stream_get_contents($pipes[1]), -1, PREG_SPLIT_NO_EMPTY);
 
             if ($error = stream_get_contents($pipes[2])) {
-                call_user_func($this->errorHandler, $error);
+                $errorHandler($error);
             }
 
             proc_close($process);

src/Symfony/Component/HttpKernel/Tests/HttpCache/TestHttpKernel.php

@@ -74,8 +74,8 @@ public function callController(Request $request)
 
         $response = new Response($this->body, $this->status, $this->headers);
 
-        if (null !== $this->customizer) {
-            call_user_func($this->customizer, $request, $response);
+        if (null !== $customizer = $this->customizer) {
+            $customizer($request, $response);
         }
 
         return $response;

src/Symfony/Component/Process/Process.php

@@ -1102,11 +1102,12 @@ private function readPipes($blocking, $close)
             $result = $this->processPipes->read($blocking);
         }
 
+        $callback = $this->callback;
         foreach ($result as $type => $data) {
             if (3 == $type) {
                 $this->fallbackExitcode = (int) $data;
             } else {
-                call_user_func($this->callback, $type === self::STDOUT ? self::OUT : self::ERR, $data);
+                $callback($type === self::STDOUT ? self::OUT : self::ERR, $data);
             }
         }
     }

src/Symfony/Component/Process/Tests/AbstractProcessTest.php

@@ -747,7 +747,7 @@ public function testMethodsThatNeedARunningProcess($method)
     {
         $process = $this->getProcess('php -m');
         $this->setExpectedException('Symfony\Component\Process\Exception\LogicException', sprintf('Process must be started before calling %s.', $method));
-        call_user_func(array($process, $method));
+        $process->{$method}();
     }
 
     public function provideMethodsThatNeedARunningProcess()
@@ -769,7 +769,7 @@ public function testMethodsThatNeedATerminatedProcess($method)
         $process = $this->getProcess('php -r "sleep(1);"');
         $process->start();
         try {
-            call_user_func(array($process, $method));
+            $process->{$method}();
             $process->stop(0);
             $this->fail('A LogicException must have been thrown');
         } catch (\Exception $e) {

src/Symfony/Component/Routing/Loader/ClosureLoader.php

@@ -37,7 +37,7 @@ class ClosureLoader extends Loader
      */
     public function load($closure, $type = null)
     {
-        return call_user_func($closure);
+        return $closure();
     }
 
     /**