3v4l.org

run code in 300+ PHP versions simultaneously
<?php function foo(): string|void { }
Output for 8.0.1 - 8.0.29, 8.1.0 - 8.1.20, 8.2.0 - 8.2.7
Fatal error: Void can only be used as a standalone type in /in/7iULB on line 3
Process exited with code 255.
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182.15 ms | 1000 KiB | 7 Q