Getting thumbnails of a custom posts featured images in a page-templates metabox

Question

I guess I need to know how to call meta data into metaboxes for beginners.

I'm using

$posts = get_posts(array(
        'post_type'   => 'slidertype',
        'post_status' => 'publish',
        'posts_per_page' => -1,
        'fields' => 'ids'
        )
    );
    //loop over each post
    foreach($posts as $p){
        //get the meta you need form each post
        $thumb = get_post_meta($p,"_thumbnail_id",true);

        echo $thumb;

To try to get thumbnails of my custom post type 'slidertype' to show up in a page's metabox. Right now it's displaying a number which doesn't make sense to me. No advice is bad advice guys! Thanks.

Answer 1

You can get the image from your $thumb integer with the following additional code:

$thumb = get_post_meta($p,"_thumbnail_id",true);
$image = wp_get_attachment_image_src($thumb);
echo $image[0];

This will return the URL of the image, just put that in an img tag to display it.

Answer 2

You can also use get_the_post_thumbnail without having to first fetch the ID:

foreach( $posts as $p ){
    echo get_the_post_thumbnail( $p->ID, 'thumbnail' );
}

Or using setup_postdata you can use template tags that only work "in the loop":

foreach( $posts as $p ){
    setup_postdata( $p );
    the_post_thumbnail( 'large' );
}
wp_reset_postdata();