电子邮件激活

我正在尝试制作一个表单来登录并在php中注册到一个网站 . 用户只能注册管理批准 . 在PHP中我发送一封电子邮件给管理员，其中包含激活码，但此代码无法正常工作 . 在用户表中我有2行（ativo，代码）

register.php

require ("ligacaobd.php"); 
$user=$_POST['user'];
$pass=md5($_POST['pass']);
$email=$_POST['email'];

if($user && $email && $pass)
    {
        $confirmCode=rand();
        $query=mysql_query("SELECT * FROM Utilizadores WHERE User='".$user."'");
        $numrows=mysql_num_rows($query);
        if($numrows==0)
        {   
            $sql="INSERT INTO Utilizadores(Id_user,Id_type,User,Email,Password,ativo,code) VALUES(NULL,'2','$user','$email','$pass','0','$confirmCode')";
            $result=mysql_query($sql);
            if($result)
            {
                echo "Thanks! Please wait for adminstration approval!";
            } 
            else 
            {
                echo "Failure!";
            }
        } 
        else 
        {
            echo "That username already exists! Please try again with another.";
        }
        $search="SELECT * FROM Utilizadores WHERE Id_type='1'";
        $result=mysql_query($search);
        //
        while($row=mysql_fetch_assoc($result))
        {
            $subject='New Account Request';
            $from='... <...@gmail.com>';
            $emailAdmin=$row["Email"];
            $confirmUrl= 'http://.../php/confirm.php?user=$user&code=$confirmCode';
            $message=" A new account has been requested with the following details:

                   Username: $user        
                   Email: $email

                   Confirmation is required. Please click the link below to confirm registration:
                   $confirmUrl

                   Thanks";
            mail($emailAdmin, $subject, $message, 'From: ' .$from);
        }

和

confirm.php

$user=$_GET['user'];
$code=$_GET['code'];
$query=mysql_query("SELECT * FROM Utilizadores WHERE 'user'='$user'");  
while($row=mysql_fetch_assoc($query))
{
    $db_code=$row['confirmCode'];
}
if($code==$db_code)
{
    mysql_query("UPDATE Utilizadores SET 'ativo'='1'");
    mysql_query("UPDATE Utilizadores SET 'code'='0'");
    echo "Thanks. Your email has been registered";
} 
else
{
    echo "Username and code don't match!";
}

错误："Username and code don't match!"
谁能帮我？