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<?php $input = ["a", "b"]; function search($input) { $result = $input; foreach($input as $a) foreach($input as $b) $result []= $a . $b; array_walk($result, null); return array_unique($result); } echo json_encode(search($input));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: array_walk(): Argument #2 ($callback) must be a valid callback, no array or string given in /in/1SKcf:12 Stack trace: #0 /in/1SKcf(12): array_walk(Array, NULL) #1 /in/1SKcf(16): search(Array) #2 {main} thrown in /in/1SKcf on line 12
Process exited with code 255.

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