Replace value within an array with multiple new values while keeping the numerical order AKA insert/replace into the middle of array.

array_insert_into_middle.php

<?php
/**
 * replace value within an array with multiple new values while keeping the numerical order
 * AKA insert/replace into the middle of array
 *
 * @param $parentArray
 * @param int $numericalKey the key of the element to be removed
 */

$parentArray = array(0,1,2,3,4,5,6,7,8,9);
$numericalKey = 3;

array_splice($parentArray, $numericalKey, count($parentArray),
	array_merge(array('values', 'to', 'be', 'inserted'),
		 array_slice($parentArray, $numericalKey+1)));

print_r($parentArray);
// outputs Array ( [0] => 0 [1] => 1 [2] => 2 [3] => values [4] => to [5] => be [6] => inserted [7] => 4 [8] => 5 [9] => 6 [10] => 7 [11] => 8 [12] => 9 )