| <?php | |
| /** | |
| * Schema Markup for Display Posts Shortcode | |
| * @author Bill Erickson | |
| * @see https://www.billerickson.net/code/schema-markup-display-posts-shortcode | |
| * | |
| * @param string $open_markup | |
| * @param array $atts, shortcode attributes | |
| * @param object $loop | |
| * @return string | |
| */ | |
| function ea_dps_schema( $open_markup, $atts, $loop ) { | |
| $json = ea_json_summary_markup( $loop ); | |
| return $json . $open_markup; | |
| } | |
| add_filter( 'display_posts_shortcode_wrapper_open', 'ea_dps_schema', 40, 3 ); | |
| /** | |
| * JSON Summary Markup | |
| * @see https://developers.google.com/search/docs/guides/mark-up-listings#summary-page--multiple-full-details-pages | |
| * | |
| */ | |
| function ea_json_summary_markup( $loop = false ) { | |
| global $wp_query; | |
| $loop = empty( $loop ) ? $wp_query : $loop; | |
| if( ! $loop->have_posts() ) | |
| return; | |
| $output = array(); | |
| foreach( $loop->posts as $i => $post ) { | |
| $position = $i + 1; | |
| $output [] = '{ | |
| "@type":"ListItem", | |
| "position":' . $position . ', | |
| "url":"' . get_permalink( $post->ID ) . '" | |
| }'; | |
| } | |
| return '<script type="application/ld+json"> | |
| { | |
| "@context":"http://schema.org", | |
| "@type":"ItemList", | |
| "itemListElement":[' . join( ',', $output ) . '] | |
| } | |
| </script>'; | |
| } |