I've grabbed the code from this previous support post; http://wordpress.org/support/topic/use-the-post-image-to-wp_list_pages?replies=9#post-1386992 and tweaked it ever so slightly to only show the pages where a custom field equals a certain value, but it doesn't work.
I've been round and round and simplified the code as much as possible - but still nothing. Can anyone tell me if there's something wrong with the get_pages code here, it works fine if I pull in pages without mentioning the meta_key / value.
<?php
$pages = get_pages('meta_key=productfeatured&meta_value=yes');
$output = '';
foreach($pages as $value){
$thumb = get_the_post_thumbnail( $value->ID, array(175,175), $attr = '' );
$output .= "<li>";
$output .= "<a href='" . $value->post_name . "' >" . $thumb . "</a><br />";
$output .= "<a href='" . $value->post_name . "' >" . $value->post_title . "</a>";
$output .= "</li>";
}
echo $output;
?>