• Would be good to be able to search custom fields for URLs as well with this plugin (it currently only searches the main content)

    I changed the line

    $image_url = self::found_image_url($post->post_content);

    to

    $image_url = self::found_image_url(get_post_meta($post->ID, 'youtube_link',true));
    
            if( $image_url == null ) $image_url = self::found_image_url($post->post_content);

    Which worked well for me. I’m sure there’s a neater way for this to be done by iterating through an array of the meta, but this was my quick-fix.

    http://wordpress.org/extend/plugins/auto-featured-image/

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