3v4l.org

run code in 300+ PHP versions simultaneously
<?php $b = [1, 2, 3]; foreach(&$b ?: [] as &$v){ $v = $v*2; unset($v); } var_dump($b);
Output for 5.5.24 - 5.5.30, 5.6.8 - 5.6.15
Parse error: syntax error, unexpected '&' in /in/r9fGZ on line 5
Process exited with code 255.
preferences:
185.17 ms | 1395 KiB | 22 Q