这是对this post, 概述在函数中无法使用get\\u terms函数的原因。php（实际上是通过ajax/admin\\u ajax.php调用）。

我可以在任何帖子、任何页面上获取术语（自定义税），除了在我的ajax函数中。在转储get\\u terms的值时，我收到了可怕的“分类法不存在”错误。

问题是，在调用函数查找术语后，分类法被注册。

问题是，如何尽早注册税务以便使用此功能？注册自定义帖子类型和分类的代码是函数中的第一个。php（通过外部php提供，以保持functions.php干净）

/************************************************ 
*
* 1.0 ------------------ Events ----------------
*
************************************************/


// 1. Custom Post Type Registration (Events)
add_action( \'init\', \'create_event_postype\', 0 );

function create_event_postype() {
  $labels = array(
    \'name\' => _x(\'Events\', \'post type general name\'),
    \'singular_name\' => _x(\'Event\', \'post type singular name\'),
    \'add_new\' => _x(\'Add New\', \'events\'),
    \'add_new_item\' => __(\'Add New Event\'),
    \'edit_item\' => __(\'Edit Event\'),
    \'new_item\' => __(\'New Event\'),
    \'view_item\' => __(\'View Event\'),
    \'search_items\' => __(\'Search Events\'),
    \'not_found\' =>  __(\'No events found\'),
    \'not_found_in_trash\' => __(\'No events found in Trash\'),
    \'parent_item_colon\' => \'\',
);

$args = array(
    \'label\' => __(\'Events\'),
    \'labels\' => $labels,
    \'public\' => true,
    \'can_export\' => true,
    \'show_ui\' => true,
    \'_builtin\' => false,
    \'_edit_link\' => \'post.php?post=%d\', // ?
    \'capability_type\' => \'post\',
    \'menu_icon\' => get_bloginfo(\'template_url\').\'/images/icons/events.png\',
    \'hierarchical\' => false,
    \'rewrite\' => array( "slug" => "events" ),
    \'supports\'=> array(\'title\', \'thumbnail\', \'excerpt\', \'editor\', \'custom-fields\') ,
    \'show_in_nav_menus\' => true,
    \'taxonomies\' => array(\'post_tag\', \'tf_eventtype\')
);

register_post_type( \'tf_events\', $args);

}

// 2. Custom Taxonomy Registration (Event Types)
add_action( \'init\', \'create_eventtype_taxonomy\', 0 );
function create_eventtype_taxonomy() {

  $labels = array(
    \'name\' => _x( \'Event Type\', \'taxonomy general name\' ),
    \'singular_name\' => _x( \'Event Type\', \'taxonomy singular name\' ),
    \'search_items\' =>  __( \'Search Event Types\' ),
    \'popular_items\' => __( \'Popular Event Types\' ),
    \'all_items\' => __( \'All Event Types\' ),
    \'parent_item\' => null,
    \'parent_item_colon\' => null,
    \'edit_item\' => __( \'Edit Event Type\' ),
    \'update_item\' => __( \'Update Event Type\' ),
    \'add_new_item\' => __( \'Add New Event Type\' ),
    \'new_item_name\' => __( \'New Event Type Name\' ),
    \'separate_items_with_commas\' => __( \'Separate event types with commas\' ),
    \'add_or_remove_items\' => __( \'Add or remove event types\' ),
    \'choose_from_most_used\' => __( \'Choose from the most used event types\' ),
);

register_taxonomy(\'tf_eventtype\',\'tf_events\', array(
    \'label\' => __(\'Event Type\'),
    \'labels\' => $labels,
    \'hierarchical\' => true,
    \'show_ui\' => true,
    \'query_var\' => true,
    \'rewrite\' => array( \'slug\' => \'event-type\' ),
));
}

下面是一些伪代码，演示如何调用此函数

在自定义页面中，我通过AJAX调用函数（AJAX admin.php）

$.ajax({  
            type: "POST",  
            url: "<? bloginfo(\'url\'); ?>/wp-admin/admin-ajax.php", //Built in WP AJAX
            data: data, 
            success:  function(data){
                         //console.log(\'search complete\');
                         $("#event-list").html(data)                                                         
                         }  
    });

下面是调用自定义查询的函数，其中get\\u terms失败。

/****************************************************************
*
* 1.0 Calendar AJAX Queries
*
****************************************************************/
// if both logged in and not logged in users can send this AJAX request,
// add both of these actions, otherwise add only the appropriate one
add_action( \'wp_ajax_nopriv_calendar_search\', \'calendar_search\' );
add_action( \'wp_ajax_calendar_search\', \'calendar_search\' );

function calendar_search() {        
        $args = array(
            \'post_type\' => \'tf_events\',         
            \'post_status\' => \'publish\',
            \'order\' => \'ASC\'
        );

        $query = new WP_Query( $args ); 

        // - loop start -
        if ( $query->have_posts() ) {

         while ($query->have_posts()) : $query->the_post(); /*Shows the posts that are available. */

                //Event Type
                $cats = get_the_terms($post->ID , \'tf_eventtype\'); //the function that fails. All other custom data works fine 

                echo 
                \'<article class="post" id="post-\'. $post->ID . \'"  itemscope itemtype="http://schema.org/Event">                       
                   <time></time>
                   <h2  itemprop="name" class="entry-title"><a href="\' . get_permalink() .\'">\'. get_the_title() . \'</a></h2>                
                   <div class="entry">
                     <p itemprop="location">\';
                       if($cats) foreach($cats as $cat){ 
                            echo " | " . $cat->name;
                       }
                       echo 
                     "</p>  
                   </div><!--#entry-->
                 </article>";

            endwhile; 
         } else {
            echo "<h2 class=\'month\'>Sorry, no events found!</h2>";            
          } 
        die(); // this is required to return a proper result      

}

$action = isset($_POST[\'action\']) ? $_POST[\'action\'] : null;

//These functions take an ajax call and then call the appropriate PHP function
// this hook is fired if the current viewer is not logged in
do_action( \'wp_ajax_nopriv_\' . $action );
do_action( \'wp_ajax_\' . $action );

while ($query->have_posts()) : $query->the_post();
  global $post;
  $cats = get_the_terms($post->ID , \'tf_eventtype\');
  //... and so on

        add_action( \'init\', function() {

            //add the ajax hook only when all the taxonomies have been registered
            add_action(\'wp_ajax_my_action\',  function() {

                $result = get_terms( \'my_taxonomy_name\' );
            }

        }, 99);