Falla en arreglo array

[hoberwilly]

Segun el manual:
Es una función que permite añadir los datos a un lugar particular en un conjunto sin perder cualquier otro dato en la serie.

segun ejemplo:
<?php
$list = array( "0" => "zero",
"1" => "one",
"2" => "two",
"3" => "three",
"4" => "four",
"5" => "five",
"6" => "six");
$value = "New Number Three";
$key = "3";
$new = insert_into_array($list,$key, $value);
?>

Will Return:

$list =
Array
(
[0] => zero
[1] => one
[2] => two
[3] => three
[4] => four
[5] => five
[6] => six
)

$new=
Array
(
[0] => zero
[1] => one
[2] => two
[3] => New Number Three
[4] => three
[5] => four
[6] => five
[7] => six
)
y eso justamente es lo que intento realizar!!!!!!!!!!!!!!!!!!!!!!!