<?php
$dizi = array(0, '', 2, '', '', 5, '', '', 8, '');
$yeni = array(0, 1, 2, 3, 4, 5, 6, 7, 8, 9);
$narr = array_combine($yeni, $dizi);
print_r($narr);

/*
Array
(
    [0] => 0
    [1] => 
    [2] => 2
    [3] => 
    [4] => 
    [5] => 5
    [6] => 
    [7] => 
    [8] => 8
    [9] => 
)
*/
?>