登录错误 - 不直接

Question

因此，当我登录时，使用正确的ID和密码，它只会显示为“错误的ID或密码”。不知道为什么会这样。我弄错了吗？或者是别的什么？请帮忙......谢谢。我只是想说，当注册密码被加密并使用“crypt”存储时。在定义$ pw时我是否需要定义 - 这就是为什么它不起作用？

UPDATE = I used this tutorial/website

process_login.php

<?php
$host="localhost"; // Host name 
$username="*******"; // Mysql username 
$password="*******"; // Mysql password 
$db_name="*******"; // Database name 

// Connect to server and select database.
mysql_connect("$host", "$username", "$password")or die("cannot connect"); 
mysql_select_db("$db_name")or die("cannot select DB");

// username and password sent from form 
$id=$_POST['ID']; 
$pw=$_POST['Password']; 


// To protect MySQL injection (more detail about MySQL injection)
$id = stripslashes($id);
$pw = stripslashes($pw);
$id = mysql_real_escape_string($id);
$pw = mysql_real_escape_string($pw);

$sql="SELECT * FROM User WHERE ID='$id' and Password='$pw'";
$result=mysql_query($sql);


// Mysql_num_row is counting table row
$count=mysql_num_rows($result);
// If result matched $id and $pw, table row must be 1 row


if($count==1){
    $result=mysql_fetch_array($result);
    $st = $result['Status'];

    //page link on the basis of user Status you can add more  condition on the basis of ur roles in db
    if($st == '0'){
        $link = 'menu_user.php';
    }
    elseif($st == '1'){
        $link = 'menu_staff.php';
    }
    elseif($st == '2'){
        $link = 'menu_admin.php';
    }

   // session Register $id, $pw and redirect 
   $_SESSION["ID"] = $id;
   $_SESSION["Password"] = $pw;
   $_SESSION["Status"] = $st;
   header("Location: ".$link."");
}
else {
    echo "Wrong ID or Password";
    echo"<META HTTP-EQUIV='Refresh' Content='2; URL=http://******/index.php'>";
}

?>