3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a ?? $b ?? $c ?? $d ?? 3;
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/eev8o on line 3
Process exited with code 255.

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133.18 ms | 401 KiB | 179 Q