3v4l.org

run code in 300+ PHP versions simultaneously
<?php $langs = array('en' => 'english', 'de' => 'german'); echo key(reset($langs));
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught TypeError: key(): Argument #1 ($array) must be of type array, string given in /in/kSBGO:4 Stack trace: #0 /in/kSBGO(4): key('english') #1 {main} thrown in /in/kSBGO on line 4
Process exited with code 255.
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 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
Warning: key() expects parameter 1 to be array, string given in /in/kSBGO on line 4
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.4, 5.1.0 - 5.1.6, 5.2.0 - 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

preferences:
315.42 ms | 401 KiB | 357 Q