PHP ---如果（！session_is_registered過時？

Question

這個if語句已被棄用

if(!session_is_registered('firstname')){ 
header("location: index.php"); // << makes the script send them to any page we set 
} else { 
print "<h2>Could not log you out, sorry the system encountered an error.</h2>"; 
exit(); 
} 

我

if (isset($_SESSION['firstname'])){ 
header("location: index.php"); // << makes the script send them to any page we set 
} else { 
print "<h2>Could not log you out, sorry the system encountered an error.</h2>"; 
exit(); 

取代了它的初始代碼連接到我的logout.php腳本時。然後我去鏈接logout.php，這是顯示「無法登出你，對不起系統遇到錯誤。」

這是正確的解決方案，因爲我沒有問題的代碼

Answer 1

你有session_start（）;在你的網頁上？

http://php.net/manual/en/function.session-start.php

Answer 2

根據您的第一個片段，我覺得你在邏輯上是失敗的。

嘗試：

if (!isset($_SESSION['firstname'])){ 
    header("location: index.php"); // << makes the script send them to any page we set 
} else { 
    exit('<h2>Could not log you out, sorry the system encountered an error.</h2>'); 
}