3v4l.org

run code in 300+ PHP versions simultaneously
<?php function sum($a): ?void { return null; } sum(0);
Output for 7.1.0 - 7.1.7
Fatal error: Void type cannot be nullable in /in/cI7Hl on line 3
Process exited with code 255.
Output for 7.0.0 - 7.0.20
Parse error: syntax error, unexpected '?' in /in/cI7Hl on line 3
Process exited with code 255.
preferences:
169.16 ms | 1394 KiB | 36 Q