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featured image from attached images

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  • July 26, 2018 at 5:48 PM #10736
    tech500tech500
    Participant

    Hello,

    Is there a way to have the featured image set by the first image attached to an "image_advanced" field?

    The client uploads a few images to the post, and I want the featured image to get populated by the first image that's attached.

    Thanks
    Dan

    July 27, 2018 at 5:42 PM #10751
    Anh TranAnh Tran
    Keymaster

    Hi Dan,

    The function get_the_post_thumbnail has a filter post_thumbnail_html that you can use to output the correct image:

    add_filter( 'post_thumbnail_html', function( $html, $post_id, $post_thumbnail_id, $size, $attr ) {
    $gallery = rwmb_meta( 'field_id', array( 'size' => $size ), $post_id );
    if ( empty( $gallery ) ) {
        return $html;
    }
    $image = reset( $gallery );
    $html = wp_get_attachment_image( $image['id'], $size, false, $attr );
    return $html;
}, 10, 5 );
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