PHP Session Get函数不起作用


PHP Session Get Function Doesnt Work

我有一个小问题,login.php注册我的用户名和密码。并重定向到index.php?bolum=panel(控制面板)

login:

session_start();
$_SESSION['myusername'] = $myusername; 
$_SESSION['mypassword'] = $mypassword;
if(session_is_registered(myusername))
{
    echo "<script> window.location.replace('index.php?bolum=panel') </script>";
}

And Control Panel => Panel .php

    <?php session_start(); ?>
    Username: <?php echo $_SESSION['myusername']; ?> <br/>
    Password: <?php echo $_SESSION['mypassword']; ?> 

为什么不工作,我不能设置我的用户名和密码在panel.php

session_start必须在任何输出发送到浏览器之前被调用。这包括开始的<?php之前的空白字符。移除它们。另外,对于开发,激活错误报告:

<?php
ini_set('display_errors', 'on');
error_reporting(-1);

首先- login.php:

<?php
session_start();
$_SESSION['myusername'] = $myusername; 
$_SESSION['mypassword'] = $mypassword;
if(isset($_SESSION['myusername'])){
   header('Location: index.php?bolum=panel');
}
?>

以及如何从index.php中获得?bolum=panel to panel.php?