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PHP---if（！session_）已注册不推荐？_Php - Fatal编程技术网
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PHP---if（！session_）已注册不推荐？

php

PHP---if（！session_）已注册不推荐？,php,Php,此if语句已被弃用 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();

此if语句已被弃用

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();
}

如果（！session_已注册（'firstname'））{
页眉（“location:index.php”）；//页面上是否有session_start（）


根据你的第一个片段，我认为你在逻辑上失败了

尝试：


if（！isset（$\u会话['firstname']））{

header（“location:index.php”）；//若要使用基于cookie的会话，必须在将任何内容输出到浏览器之前调用session_start（）。如果
$\u session['firstname']
可能为null但已设置，请尝试
数组_key_exists（'firstname'，$\u session）
此外，在第一个示例中，如果变量不存在，则重定向；在第二个示例中，如果变量存在，则重定向。这是您的预期操作吗？

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();



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>');
}