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<?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 git.master_jit, git.master
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.

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