Symfony\Bundle\FrameworkBundle\Debug\TraceableEventDispatcher::getListenerInfo PHP Method

    private function getListenerInfo($listener, $eventName)
    {
        $info = array('event' => $eventName);
        if ($listener instanceof \Closure) {
            $info += array(
                'type' => 'Closure',
                'pretty' => 'closure'
            );
        } elseif (is_string($listener)) {
            try {
                $r = new \ReflectionFunction($listener);
                $file = $r->getFileName();
                $line = $r->getStartLine();
            } catch (\ReflectionException $e) {
                $file = null;
                $line = null;
            }
            $info += array(
                'type'  => 'Function',
                'function' => $listener,
                'file'  => $file,
                'line'  => $line,
                'pretty' => $listener,
            );
        } elseif (is_array($listener) || (is_object($listener) && is_callable($listener))) {
            if (!is_array($listener)) {
                $listener = array($listener, '__invoke');
            }
            $class = get_class($listener[0]);
            try {
                $r = new \ReflectionMethod($class, $listener[1]);
                $file = $r->getFileName();
                $line = $r->getStartLine();
            } catch (\ReflectionException $e) {
                $file = null;
                $line = null;
            }
            $info += array(
                'type'  => 'Method',
                'class' => $class,
                'method' => $listener[1],
                'file'  => $file,
                'line'  => $line,
                'pretty' => $class.'::'.$listener[1],
            );
        }

        return $info;
    }