php - 提交时显示PHP错误

Question

我试图在用户输入当前密码并且密码正确但不再输入任何内容时弹出错误消息。所以例如用户想要更改他/她的密码，输入当前密码并输入正确的密码，然后按提交。它应该显示一条错误消息“请输入所有字段!”。现在什么都没有，我真的被困住了:(

任何帮助都会很棒!

图片 1:http://gyazo.com/e58f10783bf14c79de487f4eeb05f7e8

图像 2:http://gyazo.com/ea789cc87166cea88453d6c1c59733b6

(这里应该说，请填写所有字段!)

我的代码:

<title>Hondac</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
<link href='http://fonts.googleapis.com/css?family=Julius+Sans+One' rel='stylesheet' type='text/css'>
<link href="../css/style.css" rel="stylesheet" type="text/css" media="all" />



<?php
session_start();



$username = $_SESSION['sess_user'];

    echo '<div class="search1"><h2>'.$username.'</h2><div class="search12"><h2><a href="index.php">Home</a></h2></p></div></div>';


    if (isset($_SESSION['sess_user']))
    {
        //user is logged in

        if (isset($_POST['submit']))
        {
            //start changing password
            //check fields

            $oldpassword = md5($_POST['oldpassword']);
            $newpassword = md5($_POST['newpassword']);


            $repeatnewpassword = md5($_POST['repeatnewpassword']);


            //check password against db
            include('../includes/config.php');

            $queryget = mysql_query("SELECT password FROM login WHERE username='$username'") or die ("change password failed");
            $row = mysql_fetch_assoc($queryget);
            $oldpassworddb = $row['password'];

            //check passwords
            if ($oldpassword==$oldpassworddb && !empty($_POST['oldpassword'])) 



            {



                if (isset($_POST['repeatnewpassword']) AND isset($_POST['newpassword']) AND $_POST['newpassword'] != '') {
                    if ($newpassword==$repeatnewpassword)
                    {
                        $querychange = mysql_query("UPDATE login SET password='$newpassword' WHERE   username='$username'");
                        echo "<div class='successmate'><br><br><br><br><hr>Password has been changed!</hr></div><div class='successmate'><br><hr><br><h2><p><a href='index.php'><br><br></a></p></h2></div>";
                    }
                    else {echo "<div class='results'>new password(s) dont match</div><div class='successmate'><br><br><h2><p><a href='changepassword.php'>try again?</a></p></h2></div>";}

                }




            }
            else {echo "<div class='results'>current password doesnt match</div><div class='successmate'><h2><p><a href='changepassword.php'><br><br>Try again?</a></p></h2></div>";}





            if (isset($_POST['email']) AND $_POST['email'] != '') {
                $querychange = mysql_query("UPDATE login SET email='$email' WHERE   username='$username'");
                echo "<div class='successmate'><br><br><br><br><hr>Your email has been changed</hr></div><div class='successmate'><br><hr><br><h2><p><a href='index.php'><br><br></a></p></h2></div>";
            }}


        else
        {

            echo"
        <form class='search1' action='changepassword.php' method='POST'>
        <label>Current Password:*</label> <input type='password' id='password' name='oldpassword' required><p>
        <label>New Password:*</label> <input type='password' id='password' name='newpassword'><p>
        <label>Repeat New Password:*</label> <input type='password'  name='repeatnewpassword'><p>
        <input type='submit' name='submit' class='submit' value='submit'><br><br><br>
        </form>
        ";


        }}
    else
        die ("You must be logged in to change your password");


    ?>

<img src="../images/main.jpg">

Answer 1

检查字段是否为空:

if(empty($newpassword) || empty($repeatnewpassword)){
    echo 'All fields required.';
}else{
    //continue with code
}