3v4l.org

run code in 500+ PHP versions simultaneously
<?php function merge(mixed $one, mixed $two): array { return array_merge($one, $two); } function spread(mixed $one, mixed $two): array { return [...$one, ...$two]; } spread(null, ['foo']); //merge(null, ['foo']);
Output for 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
Fatal error: Uncaught Error: Only arrays and Traversables can be unpacked, null given in /in/2YVCi:10 Stack trace: #0 /in/2YVCi(13): spread(NULL, Array) #1 {main} thrown in /in/2YVCi on line 10
Process exited with code 255.
Output for 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30
Fatal error: Uncaught Error: Only arrays and Traversables can be unpacked in /in/2YVCi:10 Stack trace: #0 /in/2YVCi(13): spread(NULL, Array) #1 {main} thrown in /in/2YVCi on line 10
Process exited with code 255.
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