Adding if(empty(USER_ID)) makes an error

Question

protected function isLogin()

{

if(empty(USER_ID))

{

$this->error('User Not logged in, please log in',url('user/login'));

}

}

Answer 1

What is the error message?

Answer 2

This is obviously not a variable. PHP loves $. You need to add $ to the variable. You need to assign a value to this variable. For example, $user_id = $_SESSION['USER_ID'].

	 	if(empty(USER_ID))
	 	{
	 		$this->error('用户未登录，请登录',url('user/login'));
	 	}

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Answer 3

You don’t send out the error message. You only have to guess when writing half of the code. What is USER_ID? Did you write it wrong? It's a variable and you didn't add $. Judging from your login, it should be a session, right? To write $_SESSION['USER_ID'];