get_post_thumbnail_id() Doesn’t return value

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I’m changing a menu from a loop with query_posts to a “custom menu” using wp_get_nav_menu_items, but I can’t seem to retrieve the post_thumbnail.

The original code I had (snippet):

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<?php
query_posts($args);
if (have_posts()) : while (have_posts()) : the_post();
    $image = wp_get_attachment_image_src(get_post_thumbnail_id());
endwhile; endif;?>

My new code: 

<?php
$menu = wp_get_nav_menu_items('Homepage blokken');
foreach($menu AS $m){
     echo $m->ID; // this echoes the correct ID
     $pThumbId = get_post_thumbnail_id($m->ID); // this returns empty
} ?>

Why is this not working?

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2 comments

  1. Dammit, I just discovered that the $m->ID I was using wasn’t actually the post->ID, but the menu->ID. I used $m->object_id to fix the issue. Hope this will help someone in the future :-S

  2. Please use this code, you will get the exact output:

    foreach ( $items as $el ) {
    if ( $el->post_parent == $parent ) {
        array_push( 
            $ret,
            array(
                'id'   => $el->object_id,
                'text' => $el->title,
                'url'  => $el->url
            )
        );
    }
}