为了详细说明Chris的回答，AJAX调用在您的函数中看起来像这样。php文件：

add_action(\'wp_ajax_add_favorite\', \'add_favorite\');

function add_favorite(){
    $post_id = $_POST[\'postID\'];
    $nonce = $_POST[\'nonce\'];
    if(!wp_verify_nonce($nonce, \'wpnonce\'))
        exit;

    if($post_id):
        $favorites = get_user_meta(get_current_user_id(), \'favorites\');
        if(in_array($post_id, $favorites)):
            $response = \'Already in favorites.\';
            $success = false;
        else:
            if(add_user_meta(get_current_user_id(), \'favorites\', $post_id, false)):
                $response = "This post was added to your favorites";
                $success = true;
            endif;
        endif;
    else:
        $success = false;
        $response = "No post ID was supplied";
    endif;

    $output = json_encode(array(\'success\'=>$success, \'response\'=>$response));
    echo $output;
    exit;
}

jQuery(\'.add-to-favorites\').click(function(){

    var data = {
        action: \'add_favorite\',
        nonce: jQuery(\'#_wpnonce\').val(),
        postID: jQuery(this).attr(\'rel\')
    };

    jQuery.post(ajaxurl, data, function(output) {
        var obj = jQuery.parseJSON(output);
        if(!obj.response) alert(\'Something went wrong with the server.\');

        if(obj.success){
            //Do Something Here
            alert(obj.response);
        }
        else{
            alert(obj.response);
        }
    });

    //Disable Click Through
    return false;
});

<a class="add-to-favorites\' rel="<?php echo $post->ID;?>" href="#">Add To Favorites</a>

不过，您需要在另一个PHP AJAX函数中执行一些反向工程，才能从收藏夹中删除。希望这对你有所帮助。

您可以使用update_user_meta 存储数据，以及get_user_meta 检索数据。至于在单击时实际保存它，您可以在用户单击链接时使用一个简单的ajax调用。查看以下资源，了解如何在Wordpress中处理AJAX。

AJAX in WordpressAJAX in Plugins