Why it always say: Undefined index: User_问答_开发者

It always says the same error even I defined the user variable. I used this so that it can print the user name of the user and other details of the user who logged in a restricted page.

Code when logging in:

  <?php require_once('../Connections/Intranet.php'); ?>
<?php
if (!function_exists("GetSQLValueString")) {
function GetSQLValueString($theValue, $theType, $theDefinedValue = "", $theNotDefinedValue = "") 
{
  ....
}

mysql_select_db($database_Intranet, $Intranet);
$query_Recordset1 = "SELECT * FROM useraccounts";
$Recordset1 = mysql_query($query_Recordset1, $Intranet) or die(mysql_error());
$row_Recordset1 = mysql_fetch_assoc($Recordset1);
$totalRows_Recordset1 = mysql_num_rows($Recordset1);
?><?php
// *** Validate request to login to this site.
if (!isset($_SESSION)) {
  session_start();
}

$loginFormAction = $_SERVER['PHP_SELF'];
if (isset($_GET['accesscheck'])) {
  $_SESSION['PrevUrl'] = $_GET['accesscheck'];
}

if (isset($_POST['User'])) {
  $loginUsername=$_POST['User'];
  $password=$_POST['Password'];
  $MM_fldUserAuthorization = "Restriction";
  $MM_redirectLoginSuccess = "Admin.php";
  $MM_redirectLoginFailed = "login.php";
  $MM_redirecttoReferrer = false;
  mysql_select_db($database_Intranet, $Intranet);

  $LoginRS__query=sprintf("SELECT UserName, Password, Restriction FROM useraccounts WHERE UserName=%s AND Password=%s",
  GetSQLValueString($loginUsername, "text"), GetSQLValueString($password, "text")); 

  $LoginRS = mysql_query($LoginRS__query, $Intranet) or die(mysql_error());
  $loginFoundUser = mysql_num_rows($LoginRS);
  if ($loginFoundUser) {

    $loginStrGroup  = mysql_result($LoginRS,0,'Restriction');

    //declare two session variables and assign them
    $_SESSION['MM_Username'] = $loginUsername;
    $_SESSION['MM_UserGroup'] = $loginStrGroup;       

    if (isset($_SESSION['PrevUrl']) && false) {
      $MM_redirectLoginSuccess = $_SESSION['PrevUrl'];  
    }
    header("Location: " . $MM_redirectLoginSuccess );
  }
  else {
    header("Location: ". $MM_redirectLoginFailed );
  }
}
?>
<!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>Untitled Document</title>
</head>

<body>
<form id="form1" name="form1" method="POST" action="<?php echo $loginFormAction; ?>">
  <label>User Name:</label>
  <input type="text" name="User" id="User" />
  <p>
    <label>Password :
    <input type="password" name="Password" id="Password" />
    </label>
  </p>
  <p>
    <label>
    <input type="submit" name="Login" id="Login" value="Login" />
    </label>
  </p>
  <p>&nbsp;  </p>
</form>
</body>
</html>
<?php
mysql_free_result($Recordset1);
?>

Code on the user page:

  <?php require_once('../Connections/Intranet.php'); ?><?php
//initialize the session
if (!isset($_SESSION)) {
  session_start();
}

// ** Logout the current user. **
$logoutAction = $_SERVER['PHP_SELF']."?doLogout=true";
if ((isset($_SERVER['QUERY_STRING'])) && ($_SERVER['QUERY_STRING'] != "")){
  $logoutAction .="&". htmlentities($_SERVER['QUERY_STRING']);
}

if ((isset($_GET['doLogout'])) &&($_GET['doLogout']=="true")){
  //to fully log out a visitor we need to clear the session varialbles
  $_SESSION['MM_Username'] = NULL;
  $_SESSION['MM_UserGroup'] = NULL;
 开发者_StackOverflow $_SESSION['PrevUrl'] = NULL;
  unset($_SESSION['MM_Username']);
  unset($_SESSION['MM_UserGroup']);
  unset($_SESSION['PrevUrl']);

  $logoutGoTo = "login.php";
  if ($logoutGoTo) {
    header("Location: $logoutGoTo");
    exit;
  }
}
?>
<?php

if (!isset($_SESSION)) {
  session_start();
}
$MM_authorizedUsers = "ADMIN";
$MM_donotCheckaccess = "false";

// *** Restrict Access To Page: Grant or deny access to this page
function isAuthorized($strUsers, $strGroups, $UserName, $UserGroup) { 
  // For security, start by assuming the visitor is NOT authorized. 
  $isValid = False; 

  // When a visitor has logged into this site, the Session variable MM_Username set equal to their username. 
  // Therefore, we know that a user is NOT logged in if that Session variable is blank. 
  if (!empty($UserName)) { 
    // Besides being logged in, you may restrict access to only certain users based on an ID established when they login. 
    // Parse the strings into arrays. 
    $arrUsers = Explode(",", $strUsers); 
    $arrGroups = Explode(",", $strGroups); 
    if (in_array($UserName, $arrUsers)) { 
      $isValid = true; 
    } 
    // Or, you may restrict access to only certain users based on their username. 
    if (in_array($UserGroup, $arrGroups)) { 
      $isValid = true; 
    } 
    if (($strUsers == "") && false) { 
      $isValid = true; 
    } 
  } 
  return $isValid; 
}

$MM_restrictGoTo = "User.php";
if (!((isset($_SESSION['MM_Username'])) && (isAuthorized("",$MM_authorizedUsers, $_SESSION['MM_Username'], $_SESSION['MM_UserGroup'])))) {    
  $MM_qsChar = "?";
  $MM_referrer = $_SERVER['PHP_SELF'];
  if (strpos($MM_restrictGoTo, "?")) $MM_qsChar = "&";
  if (isset($QUERY_STRING) && strlen($QUERY_STRING) > 0) 
  $MM_referrer .= "?" . $QUERY_STRING;
  $MM_restrictGoTo = $MM_restrictGoTo. $MM_qsChar . "accesscheck=" . urlencode($MM_referrer);
  header("Location: ". $MM_restrictGoTo); 
  exit;
}
?>
<?php
if (!function_exists("GetSQLValueString")) {
function GetSQLValueString($theValue, $theType, $theDefinedValue = "", $theNotDefinedValue = "") 
{
  $theValue = get_magic_quotes_gpc() ? stripslashes($theValue) : $theValue;

  $theValue = function_exists("mysql_real_escape_string") ? mysql_real_escape_string($theValue) : mysql_escape_string($theValue);

  switch ($theType) {
    case "text":
      $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
      break;    
    case "long":
    case "int":
      $theValue = ($theValue != "") ? intval($theValue) : "NULL";
      break;
    case "double":
      $theValue = ($theValue != "") ? "'" . doubleval($theValue) . "'" : "NULL";
      break;
    case "date":
      $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
      break;
    case "defined":
      $theValue = ($theValue != "") ? $theDefinedValue : $theNotDefinedValue;
      break;
  }
  return $theValue;
}
}

mysql_select_db($database_Intranet, $Intranet);
$query_Recordset1 = "SELECT * FROM useraccounts WHERE UserName = '" . 
    mysql_real_escape_string($_POST["User"]) . "'";
$Recordset1 = mysql_query($query_Recordset1, $Intranet) or die(mysql_error());
$row_Recordset1 = mysql_fetch_assoc($Recordset1);
$totalRows_Recordset1 = mysql_num_rows($Recordset1);
?>
<!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>Untitled Document</title>
</head>

<body>
<table width="200" border="0">
  <tr>
    <td>Name:</td>
    <td><?php echo $row_Recordset1['UserName']; ?></td>
  </tr>
  <tr>
    <td>Restriction:</td>
    <td><?php echo $row_Recordset1['Restriction']; ?></td>
  </tr>
  <tr>
    <td>Division:</td>
    <td><?php echo $row_Recordset1['Division']; ?></td>
  </tr>
</table>
<p><?php print_r($_POST) ?>;&nbsp;</p>
<p>&nbsp;<a href="<?php echo $logoutAction ?>">Log out</a></p>
</body>
</html>
<?php
mysql_free_result($Recordset1);
?>

The input name is User not UserName.

This should work:

$query_Recordset1 = "SELECT * FROM useraccounts WHERE UserName = '" . 
    mysql_real_escape_string($_POST["User"]) . "'";

In your login form, you wrote:

<input type="text" name="User" id="User" />

However at your back end code, you wrote:

$_POST['UserName']

instead of

$_POST['User']

If you're still getting the same error, then you didn't define that variable.

error_reporting(E_ALL);

$post = array( 'color' => 'blue' );
echo $post['color']; // "blue"
echo $post['food']; // Undefined index: food

Try var_dump($_POST). Is the "User" key defined?

PHP is case sensitive. MySQL is case sensitive on certain OSes (eg. Linux), but not on others. Perhaps it has something to do with that?

Why it always say: Undefined index: User

Code when logging in:

Code on the user page:

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Why it always say: Undefined index: User

Code when logging in:

Code on the user page:

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