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<?php $a = $r = $m = []; $a[1] = ['1','2','3']; $a[2] = ['4','5','6']; foreach ($a as $p) { $r = array_merge($r, $p); } var_dump($r); var_dump(array_map('array_merge', $a, [$r]));
Output for git.master, git.master_jit, rfc.property-hooks
array(6) { [0]=> string(1) "1" [1]=> string(1) "2" [2]=> string(1) "3" [3]=> string(1) "4" [4]=> string(1) "5" [5]=> string(1) "6" } Fatal error: Uncaught TypeError: array_merge(): Argument #2 must be of type array, null given in /in/1cG5s:9 Stack trace: #0 [internal function]: array_merge(Array, NULL) #1 /in/1cG5s(9): array_map('array_merge', Array, Array) #2 {main} thrown in /in/1cG5s on line 9
Process exited with code 255.

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