3v4l.org

run code in 300+ PHP versions simultaneously
<?php &$a = $b = 2; echo $a.' - '.$b; $a = 4; echo $a.' - '.$b; $b = 5; echo $a.' - '.$b;
Output for 5.3.0 - 5.3.28, 5.4.0 - 5.4.25
Parse error: syntax error, unexpected '&' in /in/TsVU4 on line 2
Process exited with code 255.

preferences:
187.74 ms | 1387 KiB | 62 Q