php - Adding custom field to permalink structure -


i have wordpress site uses custom post type 'external-projects'. within custom post type there custom field 'director'. trying rewrite permalinks include directors name. have working on external-projects messes rest of sites urls. 404s etc. below code. great.

add_action('init', 'tdd_add_rewrite_rules', 10, 0);  function tdd_add_rewrite_rules(){   // register custom rewrite rules   global $wp_rewrite;   $wp_rewrite->add_rewrite_tag('%external-projects%', '([^/]+)', 'external-projects=');   $wp_rewrite->add_rewrite_tag('%director%', '([^/]+)', 'director=');   $wp_rewrite->add_permastruct('external-projects', '/%director%/%external-projects%', false);  }    add_filter('post_type_link', 'tdd_permalinks', 10, 3);  function tdd_permalinks($permalink, $post, $leavename){ $no_data = 'no-director'; $post_id = $post->id;  if($post->post_type != 'external-projects' || empty($permalink) || in_array($post->post_status, array('draft', 'pending', 'auto-draft')))   return $permalink;   //$var1 = get_post_meta($post_id, 'director', true);   $var1 = 'test_director';// i'll later.   $var1 = sanitize_title($var1);    if(!$var1) { $var1 = $no_data; }   $permalink = str_replace('%director%', $var1, $permalink);   return $permalink; }


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