learndash_get_thumb_path learndash_get_thumb_path( int $post_id ) Gets featured image of certificate post. ContentsDescription Parameters Return Source Related Uses Used By Description # Parameters # $post_id (int) (Required) Post ID. Return # (string|void) Optional. Certificate featured image path. Default 0. Source # File: includes/ld-convert-post-pdf.php Related # Uses # Uses Uses Description includes/ld-convert-post-pdf.php: ld_certificate_image_type Filters the type of the image to use for the certificate PDF background. Used By # Used By Used By Description includes/ld-convert-post-pdf.php: learndash_certificate_post_shortcode () Converts a post to PDF.