Question

这是我的login.php页面，这是代码。我只能在注册时成功登录，但是当我在注销后再次登录时我无法再次登录。我收到用户名不正确的错误。 //错误在此行显示为“注意：未定义的索引：第15行的D：\ xampp \ htdocs \ friend \ login.php中的用户名”// 我不知道知道错误发生的位置。所有用户信息都正确存储在数据库中。

    <?php
    session_start();
    ob_start();include "config.php";

    //Check if the submit button has been clicked to process data
    if(isset($_POST["submitted"]) && $_POST["submitted"] == "yes")
    {
//Variables Assignment
**//the error is appearing in this line as "Notice: Undefined index: username in 
    D:\xampp\htdocs\friend\login.php on line 15"//**$username = 
    trim(strip_tags($_POST['username']));
$user_password = trim(strip_tags($_POST['passwd']));
$encrypted_md5_password = md5($user_password);

$validate_user_information = mysql_query("select * from 
    `friendship_system_users_table` where `username` =                         
    '".mysql_real_escape_string($username)."' and `password` =  
    '".mysql_real_escape_string($encrypted_md5_password)."'");

//Validation 
if($username == "" || $user_password == "")
{
$error = '<br><div class="info">Sorry, all fields are required to log into your  
    account. Thanks.</div><br>';
}
elseif(mysql_num_rows($validate_user_information) == 1) //Check if the information 
    of the user are valid or not
{
//The valid user info, grant the user access to the 
    and redirect this user to the welcome page
    $get_user_information = mysql_fetch_array($validate_user_information);
    $_SESSION["VALID_USER_ID"] = $username;
    $_SESSION["USER_FULLNAME"] = strip_tags($get_user_information["fullname"]);
    header("location: index.php?page_owner=".base64_encode($username));
}
else
{
    //The submitted info the user are invalid therefore, display an error 
    message on the screen to the user
    $error = '<br><div class="info">Sorry, you have provided incorrect   
    information. Please enter correct user information to proceed. Thanks.</div><br>';
}

    }
    ?>
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"   
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>Send Friend Request, Accept or Decline Request using Ajax, Jquery and  
    PHP</title>
    <link href="../../css/demonstration_body_background.css" rel="stylesheet"  
    type="text/css">
    <link rel="shortcut icon" href="../../images/favicon.ico" >
    <link rel="icon" type="image/gif" href="../../images/animated_favicon1.gif" >

    <!-- Required header file -->
    <link href="css/style.css" rel="stylesheet" type="text/css">
    </head>
    <body>
    <center>
    <div id="all_centered">
    <center>
    <div id="centered"><br>
    <div id="vasp" style="">LOG IN</div><br clear="all" /><br clear="all" /><br 
    clear="all" />

    <!-- Code Begins -->
    <center>
    <div class="vpb_main_wrapper">

    <br clear="all">
    <form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">
    <h2 align="left" style="margin-top:0px;">Users Login</h2><br />

    <div align="left" style="font-family:Verdana, Geneva, sans-serif; font-size:11px; 
    margin-bottom:10px;">Please enter your username and password below to demo this 
    system.</div><br />

    <div style="width:115px; padding-top:10px;float:left;" align="left">Your Username:   
    </div>
    <div style="width:300px;float:left;" align="left"><input type="text"  
    name="username" id="username" value="" class="vpb_textAreaBoxInputs"></div><br   
    clear="all"><br clear="all">


    <div style="width:115px; padding-top:10px;float:left;" align="left">Your Password:
    </div>
    <div style="width:300px;float:left;" align="left"><input type="password" 
    name="passwd" id="passwd" value="" class="vpb_textAreaBoxInputs"></div><br 
    clear="all"><br clear="all">


    <div style="width:115px; padding-top:10px;float:left;" align="left">&nbsp;</div>
    <div style="width:300px;float:left;" align="left">
    <input type="hidden" name="submitted" id="submitted" value="yes">
    <input type="submit" name="submit" id="" value="Login" style="margin-right:50px;" 
    class="vpb_general_button_g">
    <a href="signup.php" style="text-decoration:none;"   
    class="vpb_general_button_g">Register</a>

    </div>

   </form>
   <br clear="all"><br clear="all">
   <div style="width:450px;float:left;" align="left"><?php echo $error; ?></div><br  
   clear="all">

   </div>
   </center>
   <!-- Code Ends -->



   <br clear="all">


    <br /><br /><div style="font-family:Verdana, Geneva, sans-serif; font-
    size:11px;">Please click on register and fill in some info to really see how the 
    system works if you have not done that.</div><br /><br />
    <p style="margin-bottom:250px;">&nbsp;</p>
    </div>
    </center>
    </div>
    </center>
    </body>
    </html>

注册成为社交网络中的用户后无法登录

0 个答案: