电子邮件字段为空 Download

if($_SERVER['REQUEST_METHOD'] == "POST"){
        if(isset($_POST['login'])){
            $email =$con->real_escape_string($_POST['email']);
            $sanitized_email = filter_var($email, FILTER_SANITIZE_EMAIL);
            if(filter_var($sanitized_email, FILTER_VALIDATE_EMAIL)){
                $valid_e = 'Valid Email';
            }else{
                $invalid_e = "Invalid Email";
            }
            //////////////////////////Password Sanitization///////////////////
            if(!empty($_POST['password'])){
                $pass = md5($con->real_escape_string(filter_var($_POST['password'], FILTER_SANITIZE_STRING)));  
            }
            $stmt = $con->prepare("SELECT * FROM tb_hospital WHERE email= ? AND password = ?");
            $stmt->bind_param("ss",$sanitized_email,$pass);
            echo "SELECT * FROM tb_hospital WHERE email= ? AND password = ?'ss',$email,$pass";
            die();
            exit();
            $stmt->execute();
            $res = $stmt->get_result();
            if($res->num_rows > 0){
            //$_SESSION['mail'] = $email;
                header('Location:db.php');
            }else{
                $error="Not Authorized To Login!!";
            }
        }
    }

HTML 这是上述PHP代码的HTML

    <form class="form-login" action="login.php" method="POST">
    <h2 class="form-login-heading">sign in now</h2>
    <div class="login-wrap" style="padding-bottom: 0px;">
    <br>
    <input type="text" class="form-control" name="email" placeholder="User Email">
    <br>
    <input type="password" class="form-control" name="password" placeholder="Password">
    <label class="checkbox">
    <span class="pull-right">
    <a data-toggle="modal" href="forget.php"> Forgot Password?</a>
    </span>
    </label>
    <button class="btn btn-theme btn-block" name="login" type="submit"><i class="fa fa-lock"></i> SIGN IN</button>
    </div>
    </form>

HTML     [HTML字段] [1]     [1]：https://i.stack.imgur.com/1OqmH.png

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