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I am trying to add up custom fields from different posts. The array I created is not working.

Here is the code.

<?php $totalpricearray = query_posts('post_type=items&author='.$thisauthorID.'&tag='.$thispostID); while (have_posts()) : the_post(); 

    $productprice = get_post_meta($post->ID, "productprice", true);
    $productquantity = get_post_meta($post->ID, "productquantity", true);
    $totalproductprice = ($productprice * $productquantity);
    echo $totalproductprice, ',';

         $totalprice = array($totalpricearray);
         echo array_sum($totalprice); ?>

Any ideas,


(ps just noticed array is working but equals 0)

share|improve this question
up vote 1 down vote accepted
$totalprice_posts = get_posts('post_type=items&author='.$thisauthorID.'&tag='.$thispostID.'&numberposts=-1');
$totalprice_array = array();
foreach ($totalprice_posts as $post) {
    $productprice = get_post_meta($post->ID, "productprice", true);
    $productquantity = get_post_meta($post->ID, "productquantity", true);
    $totalproductprice = ($productprice * $productquantity);
    array_push($totalprice_array, $totalproductprice);
echo implode(',', $totalprice_array);
echo array_sum($totalprice_array);
share|improve this answer
Brilliant although its not adding up the last value in the array – Robin I Knight Feb 22 '11 at 15:42
@Robin I Knight: That sounds a bit unlikely...the last two lines are merely PHP core functions. If there were a difference it would be a bug in PHP, unless there's a type casting problem with the values. – wyrfel Feb 22 '11 at 15:59
I checked and found no explanation for it. Yet when I changed get_posts to query_posts it did add the last value. – Robin I Knight Feb 22 '11 at 16:01
@Robin I Knight FYI I rejected your edit because query_posts() should never be used for secondary loops. I am not sure why results between two function might differ in your case, but switching to query post will likely cause more issues than it solves. – Rarst Feb 22 '11 at 16:20
You know more than me I'm not arguing. Looking at it furhter though, if by secondary loop do you mean a loop within a loop, because it isn't. There are in fact 2 other loops above it one containing the page (post_type=bookings) and the other containing items (post_type=items). Both of these loops have come to their conclusion before the beginning of this one. loop is executed in full above – Robin I Knight Feb 22 '11 at 16:45

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