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run code in 150+ php & hhvm versions
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<?php echo Module::work('Hello'); class Module { public static function work($it) { return preg_replace_callback('~\w+~', array('static', 'self::replace'), $it); } private static function replace($matches) { return sprintf('[[[%s]]]', $matches[0]); } }
Output for 5.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
[[[Hello]]]
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.2.0 - 5.2.17
Warning: preg_replace_callback(): Requires argument 2, 'static::self::replace', to be a valid callback in /in/88XGR on line 8 Hello
Output for 5.0.0 - 5.1.6
Warning: preg_replace_callback(): requires argument 2, 'static::self::replace', to be a valid callback in /in/88XGR on line 8 Hello
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/88XGR on line 7
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/88XGR on line 7
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/88XGR on line 7
Process exited with code 255.