A reference is made to INSERT'ing into an array here with array_splice, however its not explained very well. I hope this example will help others find what took me days to research.
<?php
$original_array = array(1,2,3,4,5);
$insert_into_key_position = 3;
$item_to_insert = "blue";
$returned = array_splice($original_array, $insert_into_key_position, 0, $item_to_insert);
?>
Remember that you are telling the array to insert the element into the KEY position. Thus the elements start with key 0 and so on 0=>1, 1=>2, 2=>3, 3=>blue, 4=>4, 5=>5. And walla, you've inserted. I can't say if this is of any value for named keys, or multidimensional arrays. However it does work for single dimensional arrays.
$returned should be an empty array as nothing was returned. This would have substance if you were doing a replace instead.
