3v4l.org

run code in 300+ PHP versions simultaneously
<?php function event($name,$cb = null){ static $e = array(); if ( is_callable($cb) ){ empty( $e[$name] ) ? $e[$name] = array($cb) : $e[$name][] = $cb; } elseif ( false === empty($e[$name]) ) { $a = is_array($cb) ? $cb : array(); foreach ($e[$name] as $eh) call_user_func_array($eh,$a); } }
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
preferences:
275.34 ms | 406 KiB | 460 Q