<?php $array1 = ['x' => 1, 3 => 4, 't' => 8]; $array2 = ['x' => 2, 5 => 6,]; $array3 = ['x' => [3, 4, 5]]; $array4 = ['x' => [[4]]]; $arrays = [$array1, $array2, $array3, $array4]; print_r(array_merge_recursive(...$arrays));
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