3v4l.org

run code in 150+ php & hhvm versions
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<?php echo help(); function check(&$ok) { return &$ok; } function help() { $k = array(); return check($k); } ?>
Output for 5.3.0 - 5.4.15
Parse error: syntax error, unexpected '&' in /in/a9I9P on line 10
Process exited with code 255.