3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = new stdClass; call_user_func('call_user_func','exec','id',$a);
based on hpPZR
Output for 5.3.0 - 7.2.0
Warning: Parameter 2 to exec() expected to be a reference, value given in /in/HrgJV on line 4
Output for 4.3.2 - 5.2.17
Warning: exec(): Unable to fork [id] in /in/HrgJV on line 4
Output for 4.3.0 - 4.3.1
Warning: exec() [http://www.php.net/function.exec]: Unable to fork [id] in /in/HrgJV on line 4