php - 致命錯誤，類未找到，當添加Wordpress短代碼

Question

我從教程採取了以下代碼。這是爲了創建一個短代碼，我可以使用它來添加一個按鈕到我的WordPress的帖子，它直接發送消息給創建帖子的用戶。

我得到了PHP的錯誤 -

Fatal error: Class 'wpchats' not found in /homepages/22/d688271077/htdocs/clickandbuilds/VillaShare/wp-content/themes/listable/functions.php on line 755

請參閱下面的代碼的functions.php和簡碼：

add_shortcode('wpc-link-to-chat', function($atts) { 

    $a = shortcode_atts(array(
     'user_id' => wp_get_current_user()->ID 
    ), $atts); 

    $user_id = (int) "{$a['user_id']}"; 
    $wpchats = new wpchats; 
    return $wpchats->get_settings('messages_page') . "?recipient=$user_id";  
}); 

簡碼：

[wpc-link-to-chat user_id="3"] 

Answer 1

嘗試使用：

... 
$wpchats = new wpChats; 
return $wpchats->get_settings('messages_page') . "?recipient=$user_id"; 
});