Get custom taxonomies from multiple posts

1 comment

1. For each post add each term to a PHP associative array:

   foreach ( $posts as $post ) {
   
       $term_objects = get_the_terms( $post->ID, $taxonomy_name );
   
       foreach ( $term_objects as $term_object ) {
   
           // Store term objects by term name.
           $terms_list[ $term_object->name ] = $term_object;
       }
   }
   

   Let’s say Bob was listed as the cook on the first two recipes. When the first post is processed a field named Bob is added to $terms_list. On the second post the Bob field is overwritten with the same information (a term object).

   The result after looping through all posts is a list key => values where the keys are unique. Bob, for example, is only listed once.

   Since you didn’t provide any code or tell us what you wanted the output should look like, I made this example up using the get_posts() function to get the array of posts and used an unordered list to display the cooks names as links.

   $cooks = wpse_125356_get_terms_for_posts( get_posts( array( 'post_type' => 'recipe' ) ), 'cook' );
   
   if ( $cooks ) {
       echo "<ul>n";
       foreach ( $cooks as $cook ) {
   
           $url = get_term_link( $cook );
           if ( is_wp_error( $url ) ) {
               echo "t<li>{$cook->name}</li>n";
           } else {
               echo "t<li><a href='{$url}'>{$cook->name}</a></li>n";
           }
       }
       echo "</ul>nn";
   }
   
   
   /**
    * Get all unique terms for an array of posts for a given taxonomy.
    *
    * @param array $posts An array of post objects.
    * @param string $taxonomy_name The name of the taxonomy to retrieve.
    * @return array An array term objects ordered by term name.
    */
   function wpse_125356_get_terms_for_posts( array $posts, $taxonomy_name ) {
   
       $terms_list = array();
       foreach ( $posts as $post ) {
   
           $term_objects = get_the_terms( $post->ID, $taxonomy_name );
   
           // $term_objects can also be boolean false or a WP_Error object.
           if ( is_array( $term_objects ) ) {
               foreach ( $term_objects as $term_object ) {
   
                   // Store term objects by term name.
                   $terms_list[ $term_object->name ] = $term_object;
               }
           }
       }
   
       // Sort term objects by term name.
       ksort( $terms_list );
   
       // Return a list of term objects, if any.
       return array_values( $terms_list );
   }
   

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