3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = ["úù" => "u"]; foreach($a as $k => $v); echo preg_match('/['. $k . ']/', $v, 'olocú');
Output for 5.4.0 - 5.4.28
Fatal error: Only variables can be passed by reference in /in/ZCI3u on line 6
Process exited with code 255.
Output for 5.3.0 - 5.3.28
Parse error: syntax error, unexpected '[' in /in/ZCI3u on line 3
Process exited with code 255.