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Sample remove elements:

<?php
$arr = array("zero","one", "two", "three", "four", "five", "six");

array_splice($arr,3,2);
print_r($arr);
// result: Array ( [0] => zero [1] => one [2] => two [3] => five [4] => six )
?>

Sample add elements:

<?php
$arr = array("zero","one", "two", "three", "four", "five", "six");

array_splice($arr,3,0, array("test1","test2","test3"));
print_r($arr);
// result: Array ( [0] => zero [1] => one [2] => two [3] => test1 [4] => test2 [5] => test3 [6] => three [7] => four [8] => five [9] => six )
?>