我在从wp\\u ajax\\u函数内部调用类方法时遇到问题。我的代码如下所示：

 class Cart {

    public $cart_content;
    public $cart_id;
    public $db;

    public function __construct() {
        $this->db           = $GLOBALS[\'wpdb\'];

        add_action( \'wp_ajax_update_cart\', array($this, \'update_cart\') );
        add_action( \'wp_ajax_nopriv_update_cart\', array($this, \'update_cart\') );
    }

    public function get_cart_content($cart_id = false) {
        if( !$cart_id ) $cart_id = $this->cart_id;

        $content = $this->db->get_row( $this->db->prepare("SELECT content FROM {$this->db->prefix}$this->cart_table WHERE cart_id = \'%s\'", $cart_id) );
        $this->cart_content = $content ? unserialize($content->content) : $content;

        return $this->cart_content;
    }

    public function update_cart() {
        $items = $_POST[\'items\'];

        wp_send_json( $this->get_cart_content()) );
    }

问题是我无法访问update\\u cart（）函数中的类属性。因此，当我调用get\\u cart\\u contents（）方法时，它返回null。提前感谢您的帮助。拉法尔

     public function create_cart_id() {
        if( is_user_logged_in() ) {
            $this->create_logged_in_cart_id();
        }else {
            $this->create_non_logged_in_cart_id();
        }

        return $this->cart_id; - adding that line solved the problem
    }