findListener() public method

Find listener for event. Returns int greater or equal 0 if listener is found or null if not.
public findListener ( string $event, callable $listener ) : integer | null
$event string
$listener callable
return integer | null
EventEmitterInterface Interface Documentation
Example #1
0
 /**
  * @see EventEmitterInterface::findListener
  */
 public function findListener($event, callable $listener)
 {
     return $this->emitter->findListener($event, $listener);
 }
Example #2
0
 /**
  * @dataProvider emitterProvider
  */
 public function testApiFindListener_FindsListener(EventEmitterInterface $emitter)
 {
     $fun = function () {
     };
     $emitter->on('test', $fun);
     $this->assertSame(null, $emitter->findListener('test', function () {
     }));
     $this->assertSame(0, $emitter->findListener('test', $fun));
 }