3v4l.org

run code in 300+ PHP versions simultaneously
<?php $str = "abc_def_ghi_jkl"; $str = preg_replace_callback("/(?:^|_)([a-z])/", $str, function($matches) { return strtoupper($matches[1]); } echo $str;
Output for 5.4.0 - 5.4.29
Parse error: syntax error, unexpected 'echo' (T_ECHO) in /in/As0me on line 7
Process exited with code 255.
Output for 5.3.0 - 5.3.28
Parse error: syntax error, unexpected T_ECHO in /in/As0me on line 7
Process exited with code 255.
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