3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php function fromCamelCaseToUnderscores($str) { $str[0] = strtolower($str[0]); // Just in case first character is uppercase. $str = str_replace('ID', 'Id', $str); // Hack for the way CATS defies camelCase convention return preg_replace_callback('/([A-Z])/', function($char) { return '_' . strtolower($char[1]); }, $str); } var_dump(fromCamelCaseToUnderscores(null));
based on 8tpJn
Output for 5.3.0 - 7.2.0
array(1) { [0]=> string(0) "" }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/o50mS on line 9
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/o50mS on line 9
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/o50mS on line 9
Process exited with code 255.