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run code in 150+ php & hhvm versions
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<?php $str = "abc_def_ghi_jkl"; $str = preg_replace_callback("/(?:^|_)([a-z])/", $str, function($matches) { return strtoupper($matches[1]); }); echo $str;
Output for 7.1.0
Warning: preg_replace_callback(): Requires argument 2, 'abc_def_ghi_jkl', to be a valid callback in /in/7IeX2 on line 6 Recoverable fatal error: Object of class Closure could not be converted to string in /in/7IeX2 on line 6
Process exited with code 255.
Output for 5.3.0 - 5.6.28, 7.0.0 - 7.0.14
Warning: preg_replace_callback(): Requires argument 2, 'abc_def_ghi_jkl', to be a valid callback in /in/7IeX2 on line 6 Catchable fatal error: Object of class Closure could not be converted to string in /in/7IeX2 on line 7
Process exited with code 255.
Output for hhvm-3.12.0
Warning: Not a valid callback function abc_def_ghi_jkl in /in/7IeX2 on line 6
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/7IeX2 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/7IeX2 on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/7IeX2 on line 4
Process exited with code 255.