<?php


/**
  * Excludes specific posts from the Yoast SEO sitemap based on an ACF field value.
  *
  * This function hooks into the 'wpseo_exclude_from_sitemap_by_post_ids' filter provided by
  * the Yoast SEO plugin to modify the list of post IDs excluded from the generated XML sitemap.
  * It targets posts where a custom Advanced Custom Fields (ACF) field named 'post_visibility'
  * has the value 'lva-platform', ensuring these posts are not included in the sitemap.
  */
 function exclude_lva_platform_posts_from_sitemap($excluded_ids) {
 
     // Try to get cached excluded posts
     $posts_to_exclude = get_transient('excluded_lva_platform_posts');
 
     // If no cache found, run the query
     if ( false === $posts_to_exclude ) {
 
         $args = array(
             'post_type'      => 'linde_faq',
             'posts_per_page' => -1,
             'fields'         => 'ids',
             'meta_query'     => array(
                 array(
                     'key'     => 'post_visibility',
                     'value'   => 'lva-platform',
                     'compare' => '='
                 )
             )
         );
 
         $posts_to_exclude = get_posts($args);
 
         // Store in transient cache for 12 hours
         set_transient('excluded_lva_platform_posts', $posts_to_exclude, 12 * HOUR_IN_SECONDS);
     }
 
     return array_merge($excluded_ids, $posts_to_exclude);
 }
 
 add_filter('wpseo_exclude_from_sitemap_by_post_ids', 'exclude_lva_platform_posts_from_sitemap');


 ?>