If this integer is non-zero, it is a session ID and the user is redirected to the account maintenance screen with the session ID tagged on to the URL.
如果这个整数非0，那么它就是一个会话id，并且使用标记有url的会话id，用户被重定向到账号维护界面。
When a string is used as a Boolean, it is first converted to an integer, and then evaluated for truth (non-zero) or falsehood (zero).
当将字符串作为布尔值使用时，将首先把字符串转换为整数，然后再计算真(非0)或假(0)。
When a string is used as a Boolean, it is first converted to an integer, and then evaluated for truth (non-zero) or falsehood (zero).
当将字符串作为布尔值使用时，将首先把字符串转换为整数，然后再计算真(非0)或假(0)。
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