3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $test = []; var_dump(is_set($test['key']));
based on MMbEZ
Output for 7.0.0 - 7.2.0
Fatal error: Uncaught Error: Call to undefined function is_set() in /in/KD24m:5 Stack trace: #0 {main} thrown in /in/KD24m on line 5
Process exited with code 255.
Output for 5.4.2 - 5.6.28
Fatal error: Call to undefined function is_set() in /in/KD24m on line 5
Process exited with code 255.
Output for 5.3.18 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/KD24m on line 3
Process exited with code 255.