语法：

facebook_user_id()

返回：

String（字符串）

描述

With this function you can poll Facebook for the user id of the currently logged in user. This will be returned as a string, with a format similar to "07778915123" which can then be used with the other Facebook functions.

NOTE: The user must be logged in to get the ID.

例如：

fb_id = facebook_user_id();

The above code gets the user ID of the currently logged in user and stores it as a string in the variable "fb_id".