- array_splice: documentation ( source)
- print_r: documentation ( source)
<?php
$array1 = array(1,2,3,4,5,6,7,8);
$originalArray = $array1;
$array2 = array('a','b','c','d','e','f','g');
$n = count($array1);
for($x = 0; $x < $n; $x++) {
array_splice($array1, 1, $x);
print_r ($array1);
$array1 = $originalArray;
}