Compare Array's

[vocoder]

I have serveral array's i need to compare...lets say

$href_array
$body_array
$date_array

all the items are "linked"..ie, $href_array[1] relates to $body_array[1] and so on.

now, I have another set of arrays

$href_master_array
$body_master_array
$date_master_array

and they are "linked" in the same way.

what I need to do is compare the two sets of arrays and if anything in $href_array (along with linked arrays) is in $href_master_array (and linked arrays), to not include it, however if it is NOT in $href_master_array, then add it to $href_master_array(as well as all the linked arrays).

I tried something like

$href_diff_array = array_diff($href_master_array, $href_array);
$body_diff_array = array_diff($body_master_array, $body_array);
$news_diff_array = array_diff($news_master_array, $news_array);
$date_diff_array = array_diff($date_master_array, $date_array);

I was thinking I could take the difference and then add that to the master array.

however that does not seem to work. Am I doing something wrong, or just going about the wrong way of doing things?

[vocoder]

i tried array_unique, but i ran into a problem...the problem being is that the items in date_array are often the same and so iare the items in news_array...for example

$href_array[1] = "http://www.whatever.com";
$body_array[1] = "blahblah";
$date_array[1] = "Sep 30 2002";
$news_array[1] = "AP"

$href_array[2] = "http://www.newurl.com";
$body_array[2] = "a;lskdfjl;asdfj";
$date_array[2] = "Sep 30 2002";
$news_array[2] = "AP";

so array_unique will not work