Insert array PHP

array_insert.php

<?php

/**
 * Insert an array in another array
 * @param : (array)   &$array,   our main array
 * @param : (array)   $insert,   the array we want to insert
 * @param : (integer) $position, where we want to insert the array
 */
function array_insert(Array &$array, Array $insert, $position)
{
    // If position is start, just merge
    if (0 === $position) {
        $array = array_merge($insert, $array);
    } else {
        // If position is end, just merge
        if ($position >= (count($array) - 1)) {
            $array = array_merge($array, $insert);
        } else {
            // Else, cut head and tail, then merge them
            $head = array_slice($array, 0, $position);
            $tail = array_slice($array, $position);
            $array = array_merge($head, $insert, $tail);
        }
    }
}