3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $arr = array(':a' => 'b'); array_walk($arr, function ($val, &$key) { $key = ':'.$key; }); var_export($arr);
based on m4Buu
Output for 5.3.0 - 7.2.0
array ( ':a' => 'b', )
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/UvmEP on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION in /in/UvmEP on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/UvmEP on line 4
Process exited with code 255.