3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php echo preg_replace_callback("#_([a-z])#",function($r){ return ucfirst($r[0]); },'abc_def_ghj');
based on M2oDJ
Output for 5.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
abc_def_ghj
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/Wi5VT on line 3
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/Wi5VT on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/Wi5VT on line 3
Process exited with code 255.