Sometimes you may want to insert one array into another and just work on with the resulting array. array_splice() doesn't support this, as the resulting array isn't the returned value but the first argument, which is changed by reference.
Therefore you may use the following function, which inserts array $ins in array $src at position $pos. $rep can be used if $ins shouldn't be just inserted, but should replace some existing elements (the number of elements to be replaced is given in $rep).
<?php
function array_insert($src,$ins,$pos,$rep=0) {
array_splice($src,$pos,$rep,$ins);
return($src);
}
?>
