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<?php function merge() { return array_merge(...array_slice(func_get_args(), 1)); } var_dump(array_merge([1, 2, 3], [4, 5, 6], ['a' => 'b'], ['a' => 'c']), merge('foo', [1, 2, 3], [4, 5, 6], ['a' => 'b'], ['a' => 'c']));

preferences:
35.81 ms | 402 KiB | 5 Q