<?php $array_1 = array(1,2,3,4,5); $array_2 = array('a','b','c'); $positions = array(1,3,4); $positionArray = array_combine($positions, $array_2); foreach($positionArray as $key => $value){ array_splice($array_1, $key, 0, $value); } print_r($array_1);
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