3v4l.org

run code in 500+ PHP versions simultaneously
<?php class Foo { function x(&$form, &$form_state) { $form = array('hi'); } } $foo = new Foo(); $callback = array($foo, 'x'); if (!empty($callback) && is_callable($callback)) { $result = call_user_func_array($callback, array(&$form, &$form_state)); } print_r($form);
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 - 5.6.28, 7.0.0 - 7.0.20, 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 - 8.1.34, 8.2.0 - 8.2.32, 8.3.0 - 8.3.33, 8.4.1 - 8.4.24, 8.5.0 - 8.5.9
Array ( [0] => hi )
preferences:
117.45 ms | 2342 KiB | 4 Q