<?php
function array_insert($myarray,$value,$position=0)
{
$fore=($position==0)?array():array_splice($myarray,0,$position);
$fore[]=$value;
$ret=array_merge($fore,$myarray);
return $ret;
}
$a=array("a", "b","c", "d");
$a=array_insert($a,"add",3);
print_r($a);
//Array ( [0] => a [1] => b [2] => c [3] => add [4] => d )