3v4l.org

run code in 300+ PHP versions simultaneously
<?php echo help(); function check(&$ok) { return &$ok; } function help() { $k = array(); return check($k); } ?>
Output for 5.3.0 - 5.3.25, 5.4.0 - 5.4.15
Parse error: syntax error, unexpected '&' in /in/a9I9P on line 10
Process exited with code 255.
preferences:
170.37 ms | 1395 KiB | 49 Q