Replace the third and fourth elements with new elements:

 
<?
$pasta = array ("1", "2", "3","4","5","6","7");

$pasta = array_splice($pasta, 5, 2, array("element1", "element2"));
print_r($pasta);
?>

1.	Inserting New Values to an Array: array array_splice(array $original, int $offset, int $length, array $new)
2.	array_splice
3.	array_splice() function replaces the designated elements specified by the offset and the optional length input parameters with the elements in the optional array replacement_array.
4.	Inserting New Values at an Arbitrary Point in an Indexed Array
5.	array remove
6.	Remove all elements from positions 3 to (n 3):
7.	Remove a portion of the array and replace it with something else
8.	Remove the fifth and sixth elements from the array:

Replace the third and fourth elements with new elements: : array_splice « Data Structure « PHP