多个PHP错误

我在一个有用户配置文件的网站上工作，我设法完成了注册页面，一旦用户激活了该帐户，他们就有权登录。

基本上，我写了我的登录脚本，当我查看网站时，我有两个错误，它们真的很令人困惑[错误1]：注意：未定义的索引：在第160行的C:''examplep''htdocs''mountain bikers''index.php中登录[错误2]：注意：在第166行的C:''samplep''htdocs''mountan bikers''/index.php中记住return_msg=无良好

以下是登录php代码：

<?php
if ($_POST['loginEmail'] != "") {
include_once "includes/mysql_connection.php";
$loginEmail = $_POST['loginEmail'];
$loginPassword = $_POST['loginPassword'];
$loginRemember = $_POST['remember']; 
$loginEmail = strip_tags($loginEmail);
$loginPassword = strip_tags($loginPassword);
$loginEmail = mysql_real_escape_string($loginEmail);
$loginPassword = mysql_real_escape_string($loginPassword);
$pass = md5($loginPassword);
//make query
$sql = mysql_query("SELECT * FROM users WHERE email='$loginEmail' AND password='$loginPassword' AND activated='1'"); 
$login_check = mysql_num_rows($sql);
if($login_check > 0){ 
    while($row = mysql_fetch_array($sql)){ 
        $id = $row["id"];   
        session_register('id'); 
        $_SESSION['id'] = $id;
        $firstname = $row["firstname"];   
        session_register('firstname'); 
        $_SESSION['firstname'] = $firstname;
        $email = $row["email"];   
        session_register('email'); 
        $_SESSION['loginEmail'] = $email;
    } // close while
    // Remember Me Section Addition... if member has chosen to be remembered in the system
    if($remember == "yes"){
      setcookie("idCookie", $id, time()+60*24*60*60, "/"); // 60 days; 24 hours; 60 mins; 60secs
      setcookie("firstnameCookie", $firstname, time()+60*24*60*60, "/"); // 60 days; 24 hours; 60 mins; 60secs
      setcookie("emailCookie", $email, time()+60*24*60*60, "/"); // 60 days; 24 hours; 60 mins; 60secs
      setcookie("passwordCookie", $password, time()+60*24*60*60, "/"); // 60 days; 24 hours; 60 mins; 60secs
    }   
    $my_msg = "all_good";
    print "return_msg=$my_msg&id=$id&firstname=$firstname";
} else {
$my_msg = "no_good";
    print "return_msg=$my_msg"; 
  exit();
}

}// close if post
?>

我也收到了电子邮件和密码字段的未定义变量错误。此外，的登录名在每个字段中都有一个value="<?php print "$loginEmail"; ?>"。如果您需要HTML，只需询问即可。