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@ 2014-10-23T05:52:15Z

<?php

$arr1 = [
  2 => [ 1, 2, 3 ]
];

$arr2 = [
  3 => [ 2, 3, 4 ]
];

$arr3 = array_merge($arr1, $arr2);

var_dump($arr3);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
array_merge: documentation ( source)

preferences:dark modelive preview

37.44 ms | 402 KiB | 5 Q