<?php $array1 = ['0' => '1', '1' => '2', '2' => '3', '3' => '4']; $array2 = ['0' => '3', '1' => '1']; foreach ($array1 as $k => $v) { if (in_array($v, $array2)) $array1[$k] = 0; } print_r($array1);
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