3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $langs = array('en' => 'english', 'de' => 'german'); echo key(reset($langs));
based on S10cC
Output for 5.3.0 - 5.6.28, 7.0.0 - 7.1.0
Warning: key() expects parameter 1 to be array, string given in /in/kSBGO on line 4
Output for hhvm-3.10.0 - 3.12.0
Warning: Invalid operand type was used: expecting an array in /in/kSBGO on line 4
Output for 4.3.2 - 5.0.4, 5.1.0 - 5.2.17
Warning: key(): Passed variable is not an array or object in /in/kSBGO on line 4
Output for 5.0.5
Fatal error: Only variables can be passed by reference in /in/kSBGO on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Warning: key() [http://www.php.net/function.key]: Passed variable is not an array or object in /in/kSBGO on line 4