函数描述
返回当前用户 ID，需要在 Init 或之后的 Action 中调用此函数，否则可能获取不到正确的用户 ID.
Usage
$user_ID = get_current_user_id();return value
返回 int 类型的用户 ID，如果获取不到，返回 0。
get_current_user_id 获取当前用户 ID
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