<?php $array = [ 0 => 'pens', 1 => 'paper', 2 => 'pencils', 3 => 'lead', 4 => 'trashcans', 5 => 'cars', ]; $string = '2,3,5'; var_dump(implode(',', array_intersect_key($array, array_flip(explode(',', $string)))));
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