if 会话数据 codeigniter 上的语句 [英] if statement on session data codeigniter

问题描述

所以我试图隐藏或显示用户是否登录的选项.

So I am trying to hide or show options if the user is logged in or not.

我有一个简单的声明，无论我是否登录，它总是显示否.

I have this simple statement, its always showing no regardless if I am logged in or not.

if( !isset($_SESSION) ){
                    echo "yes";
                }
                else {
                    echo "no";
                }

我也试过

function __construct()
{
parent::__construct();
$this->is_logged_in();
}


    if(is_logged_in())

        {
            echo "yes";
        }

    else
    {
        echo "no";                      
    }

都不行，我也认为第一个更简单，但我不确定哪种方法会更好.

Neither works, I also think the first one if simpler, but I am not sure what method would be better.

推荐答案

isset($_SESSION) 检查变量是否设置，这里 $_SESSION 已经设置定义.

isset($_SESSION) checks if the variable is set or not and here $_SESSION is already defined.

所以在你的情况下 !(isset($_SESSION)) 是 false 因为 isset($_SESSION) 是真的并且 !true 是 false

so in your case !(isset($_SESSION)) is false coz isset($_SESSION) is true and !true is false

要检查会话值，请尝试 isset($_SESSION['key_you_set']).这将检查 key_you_set 是否存在.

To check for the session value try isset($_SESSION['key_you_set']). This will check if the key_you_set exists or not.

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