Question

即使我定义了用户变量，也总是说同样的错误。我使用它，以便它可以打印用户的用户名和登录受限页面的用户的其他详细信息。

登录时的代码：

  <?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);
?>

用户页面上的代码：

  <?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;
  $_SESSION['PrevUrl'] = NULL;
  unset($_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);
?>

Answer 1

输入名称是User not UserName。

这应该有效：

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

Answer 2

在您的登录表单中，您写道：

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

但是在你的后端代码中，你写道：

$_POST['UserName']

而不是

$_POST['User']

Answer 3

如果您仍然遇到相同的错误，那么您没有定义该变量。

error_reporting(E_ALL);

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

试试var_dump($_POST)。是否定义了“用户”键？

Answer 4

PHP区分大小写。 MySQL在某些操作系统（例如Linux）上区分大小写，但在其他操作系统上则不区分大小写。也许它与此有关？

为什么总是说：未定义的索引：用户

登录时的代码：

用户页面上的代码：

4 个答案: