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<?php $a = [1,[2,[3,[4,[5,6,7]]]],8,9]; $b = [1,[2,[3,[4,[5,6,0]]]],8,9]; $a = array_map(fn(int|array $element) => is_int($element) ? [$element] : $element, $a); $b = array_map(fn(int|array $element) => is_int($element) ? [$element] : $element, $b); $key = key(array_diff_assoc(array_merge(...$a), array_merge(...$b))); var_dump(array_merge(...$a)); var_dump(array_merge(...$b)); var_dump($key);
Output for git.master_jit, git.master, rfc.property-hooks
Warning: Array to string conversion in /in/CC0aY on line 8 Warning: Array to string conversion in /in/CC0aY on line 8 array(5) { [0]=> int(1) [1]=> int(2) [2]=> array(2) { [0]=> int(3) [1]=> array(2) { [0]=> int(4) [1]=> array(3) { [0]=> int(5) [1]=> int(6) [2]=> int(7) } } } [3]=> int(8) [4]=> int(9) } array(5) { [0]=> int(1) [1]=> int(2) [2]=> array(2) { [0]=> int(3) [1]=> array(2) { [0]=> int(4) [1]=> array(3) { [0]=> int(5) [1]=> int(6) [2]=> int(0) } } } [3]=> int(8) [4]=> int(9) } NULL

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