3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php echo strtolower(preg_replace('/([a-z])([A-Z])/', '$1_$2_$3', 'eOaUi')); die; echo preg_replace_callback('/([a-z])([A-Z])/', function (array $matches) { var_dump($matches); }, 'eOaUi');
Output for 5.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
e_o_a_u_i
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/kE6Sr on line 7
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/kE6Sr on line 7
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/kE6Sr on line 7
Process exited with code 255.