Description:
------------
When using array_merge to merge 2 arrays, the order
of elements of the first are changed. The keys are all integers unlike other existing bugs where keys are mixed integers and strings.

Reproduce code:
---------------
<?php
    $string1 = "1|Text|0-0-0-0-0-0-0";
    list ($arr1[0], $arr1[1], $string2) = explode ("|", $string1, 3);

    print ("Values of arr1 after first explode...\n");
    for ($i = 0; $i < count ($arr1); $i++)
        print ("arr1[$i] = " . $arr1[$i] . "\n");

    print ("\nValues of arr1 after second explode...\n");
    $arr1 = array_merge ($arr1, explode ('-', $string2));
    for ($i = 0; $i < count ($arr1); $i++)
        print ("arr1[$i] = " . $arr1[$i] . "\n");
?>
~

Expected result:
----------------
arr1[0] = 1
arr1[1] = Text
arr1[2] = 0
arr1[3] = 0
arr1[4] = 0
arr1[5] = 0
arr1[6] = 0
arr1[7] = 0
arr1[8] = 0

Actual result:
--------------
arr1[0] = Text
arr1[1] = 1
arr1[2] = 0
arr1[3] = 0
arr1[4] = 0
arr1[5] = 0
arr1[6] = 0
arr1[7] = 0
arr1[8] = 0