无法登录到所需位置 - not able to login to the desired location

可能的重复项：
未定义的索引：C：''wamp''www''网站''storeadmin''admin_login.php.中的用户名。密码也一样

//admin_login.php
<?php
session_start();
if(isset($_SESSION["member"])){
    header("location:index.php");
    exit();
}
?>
<?php
if(isset($_POST["username"]) && isset($_POST["password"])){     // <-  Check the user has clicked the button
  $manager = preg_replace('#[A-Za-z0-9]#i',"",$_POST["username"]);
  $password = preg_replace('#[A-Za-z0-9]#i',"",$_POST["password"]);

include "../storescripts/connect_to_mysql.php";
$sql = mysql_query("SELECT * FROM admin WHERE username ='$manager' AND password ='$password'LIMIT 1");
$exist_count = mysql_num_rows($sql);
if($exist_count == 1){
    while(mysql_fetch_array($sql)){
        $id = $row["id"];
        }
    $_SESSION["id"]= $id;
    $_SESSION["manager"]= $manager;
    $_SESSION["password"]= $password;
    header("location:index.php");
    exit();
    }
    else{
    echo 'This information is incorrect,try again <a href = "index.php">Click Here</a>';
    exit();
    }
}


?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title> AdminLogin</title>
<link rel="stylesheet" href="../style/style.css" type="text/css" media="screen"/>
</head>
<body>
<div  id="mainWrapper" > 
    <?php include_once("../template_header.php");?>
    <div id="pageContent" > 
    <div align="left" "style="margin-left:040px;"><h1>Please login to continue</h1><br />
    </div>
    <form id="form1" name="form1" method="post" action="admin_login.php"> 
    UserName<br />
    <input type="text" name="username" id="username" size="40"/>
    Password<br />
    <input type="password" name="password" id="password" size="40"/> 
    <br />
    <br />
    <br /> 
    <input type="submit" name="button" id="button" value="LogIn"/>  
    </form>
    </div>
    <?php include_once("../template_header.php");?>
</div>
</body>
</html>
//index.php
<?php
session_start();
if(!isset($_SESSION["member"])){
    header("location:admin_login.php");
    exit();
}
$managerID = preg_replace('#[^0-9]#i',"",$_SESSION["id"]);
$manager = preg_replace('#[A-Za-z0-9]#i',"",$_SESSION["manager"]);
$password = preg_replace('#[A-Za-z0-9]#i',"",$_SESSION["password"]);

include "../storescripts/connect_to_mysql.php";
$sql = mysql_query("SELECT * FROM admin WHERE id ='managerID' AND username ='$manager' AND password ='$password'LIMIT 1");
$exist_count = mysql_num_rows($sql);
if($exist_count == 0){
    echo("Your login session data in not in the database");
    exit();
}

?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<html >
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Service Admin Area</title>
<link rel="stylesheet" href="../style/style.css" type="text/css" media="screen"/>
</head>
<body>
<div  id="mainWrapper" > 
    <?php include_once("../template_header.php");?>
    <div id="pageContent" > 
    <div align="left" "style="margin-left:040px;"><h1>Hello Store Manager .What would you loke to do today</h1><br />
    <h3><a href="inventory_list.php">Manage Inventory</a></h3><br/><h3><a href="">Manage Me</a></h3><br/></div></div>
    <?php include_once("../template_header.php");?>
</div>
</body>
</html>

我面临的问题是，即使我

输入了通过phpmyadmin设置的数据库中指定的正确用户名和密码，我也无法登录到我的index.php页面。每次我尝试登录时，它都会调用admin_login.php中提到的echo 'This information is incorrect,try again Click Here'。我有点沮丧。伙计们，你能帮帮我吗？

尝试一些调试;

在preg_replace呼叫之前和之后检查 $_POST["用户名"] 和 $_POST["密码"] 的值。
在对 mysql_query（）的调用中添加一个"或死亡 mysql_error（）"以查看它是否运行正常
回显出$sql的值，以便查看查询。
header（）命令在名称和值之间不需要空格吗？还是之后的''r'？值得仔细检查。
通常在各个阶段提供更多输出，跟踪问题应该是微不足道的。

并且（一旦它起作用），请在数据库中的密码字段中添加一个crypt（）或md5（）+盐。

我很确定preg_replace正在清空您的变量

$manager = preg_replace('#[A-Za-z0-9]#i',"",$_POST["username"]);   $password = preg_replace('#[A-Za-z0-9]#i',"",$_POST["password"]);

根据 PHP 文档 http://uk.php.net/manual/en/function.preg-replace.php

您是否尝试过删除它们？