3v4l.org

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<?php $arr = [1 => [4,3,2]]; $arr1 = [2 => [5,3,9]]; $res = $arr + $arr1; var_dump($res);
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
array(2) { [1]=> array(3) { [0]=> int(4) [1]=> int(3) [2]=> int(2) } [2]=> array(3) { [0]=> int(5) [1]=> int(3) [2]=> int(9) } }
preferences:
70.2 ms | 402 KiB | 61 Q