3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php error_reporting(-1); var_dump(class_exists('Closure')); return; /** * @author Abel de Beer <abel@thispagecannotbefound.com> */ class Slot { /** * @var mixed */ public $listener; /** * @var boolean */ public $once; function __construct($listener, $once) { $this->listener = $listener; $this->once = $once; } } /** * @author Abel de Beer <abel@thispagecannotbefound.com> */ interface OnceSignalInterface { /** * Add a listener to the signal, which will be removed once it has been * executed. * * @param callable $listener A valid callable */ public function addOnce($listener); /** * Execute the signal's listeners. * * @param mixed ... Values to send to listeners */ public function dispatch(); } /** * @author Abel de Beer <abel@thispagecannotbefound.com> */ class OnceSignal implements OnceSignalInterface { /** * @var Slot[] */ protected $slots; function __construct() { $this->slots = array(); } public function addOnce($listener) { $this->slots[] = new Slot($listener, true); } public function dispatch() { foreach ($this->slots as $index => $slot) { if ($slot->once) { unset($this->slots[$index]); } $callback = $slot->listener; call_user_func($callback); } } } function myListener() { echo __FILE__.' : '.__LINE__."\n"; } $signal = new OnceSignal(); $signal->addOnce('myListener'); $signal->dispatch();
Output for 5.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
bool(true)
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.2.17
bool(false)
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/ncqvB on line 17
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/ncqvB on line 17
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/ncqvB on line 17
Process exited with code 255.