- array_splice: documentation ( source)
<?php
$original = array( '1','2','3','4','5' );
echo "Original array :"."\n";
foreach ($original as $x)
{echo "$x ";}
$inserted = '$';
array_splice( $original, 3, 0, $inserted );
echo "\n After inserting '$' the array is : \n";
foreach ($original as $x)
{echo "$x ";}
?>