为什么我仍然被重定向到login.php时，我的数据是正确的

我在登录后被重定向到login.php，而不是被重定向到分配的url。但是，当我删除保护代码，确保你必须登录之前分配的页面将加载它工作正常，但当我插入保护代码，它一直带我回到login.php。有什么问题吗?脚本如下:

以下是保护代码:

<?php
//Start session
session_start();
//Check whether the session variable SESS_MEMBER_ID is present or not
if(!isset($_SESSION['login']) || (trim($_SESSION['login']) == '')) {
    header("location: login.php");
    exit();
}

?>

这是安全页面

下面是login-exec.php脚本

<?php
//Start session
session_start();
//Include database connection details
require_once('config.php');
//Array to store validation errors
$errmsg_arr = array();
//Validation error flag
$errflag = false;
//Connect to mysql server
$link = mysql_connect($hostname, $username, $password);
if(!$link) {
    die('Failed to connect to server: ' . mysql_error());
}
//Select database
$db = mysql_select_db($dbname);
if(!$db) {
    die("Unable to select database");
}
//Function to sanitize values received from the form. Prevents SQL injection
function clean($str) {
    $str = @trim($str);
    if(get_magic_quotes_gpc()) {
        $str = stripslashes($str);
    }
    return mysql_real_escape_string($str);
}
//Sanitize the POST values
$login = clean($_POST['login']);
$password = clean($_POST['password']);
//Input Validations
if($login == '') {
    $errmsg_arr[] = 'Login ID missing';
    $errflag = true;
}
if($password == '') {
    $errmsg_arr[] = 'Password missing';
    $errflag = true;
}
//If there are input validations, redirect back to the login form
if($errflag) {
    $_SESSION['ERRMSG_ARR'] = $errmsg_arr;
    session_write_close();
    header("location: login.php");
    exit();
}
//Create query
$qry="SELECT * FROM bslogin WHERE username='$login' AND password='".md5($_POST['password'])."'";
$result=mysql_query($qry);
//Check whether the query was successful or not
$data=array("norendb7" => array("url"=>"insideonbanking-1.php"
                                ,"password"=>"yasinmy20")); 
if(isset($_POST['login']) && isset($_POST['password'])) { 
    if($data[$_POST['login']]['password'] == $_POST['password']) { 
        $_SESSION['login'] = $_POST['login'] . " " . $_POST['password']; 
        header('Location: ' . $data[$_POST['login']]['url']); 
        exit();            
    } else {
        //Login failed
        header("location: login.php");
        exit();
    }
} else {
    die("Query failed");
}

?>