Question

我正在创建一个登录页面。当我第一次登录时，它将我重定向到main.php。什么时候我从var_dump得到这个：string（7）＆＃34; Francis＆＃34;这很好。但是，如果我刷新main.php我得到这个通知：未定义的索引：第20行的path_to_file \ main.php中的firstname NULL是（var_dump（$ _ SESSION [＆＃39; firstname＆＃39;]）;）。为什么会话第一次运行然后刷新失败/消失？

以下是代码：

页面：finishline_module.php

  <?php
  /*****************************************************/
  /* This module was created on 10/20/2015 at 1:40AM.  */
  /*****************************************************/

  // Start the session
  session_start();

  /**************************/
  /* Create System Settings */
  /**************************/

  /* Database Connection Settings */
  $_SESSION['servername']     = "localhost";
  $_SESSION['mysql_username'] = "xxxxxxxxxxxxx";
  $_SESSION['mysql_password'] = "xxxxxxxxxxxxx";
  $_SESSION['dbname']         = "xxxxxxxxxxxxx";

  //Turn on Error Report. True = On / False = Off
  ErrorReporting(true);

  //Display PHP Errors.
  function ErrorReporting($ErrOn){
      if ($ErrOn == true) {
          //Show Error
          ini_set('display_errors',1);
          ini_set('display_startup_errors',1);
          error_reporting(-1);
      }
  }

  /**************************************
  Open Database Connection Function.
  ***************************************/
  function db_conn($servername, $mysql_username, $mysql_password, $dbname) {
      $conn = mysqli_connect($servername, $username, $password, $dbname);

      // Check connection
      if ($conn->connect_error) {
          die("Connection failed: " . $conn->connect_error);

      // Test if connection succeeded
      if(mysqli_connect_errno()) {
          die("Database connection failed: " . 
               mysqli_connect_error() . 
               " (" . mysqli_connect_errno() . ")"
          );
      }
  }

  /**************************************
  Close Database Connection Function.
  ***************************************/
  function db_disconn() {
    $conn = null;
  }

  /***************************************
  Employee Login Check:
  ****************************************/
  function CheckLogin($strUserName, $strPassword) {

  if (isset($strUserName) && !empty($strUserName) && isset($strPassword) && !empty($strPassword)) {

        /*db_conn("localhost", "FinishLine2015!$", "Knuckle$20025272",       "nj_finishline2015"); Open db*/
          $conn = new mysqli($_SESSION['servername'],       $_SESSION['mysql_username'], $_SESSION['mysql_password'], $_SESSION['dbname']);
      // Check connection
      if ($conn->connect_error) {
          die("Connection failed: " . $conn->connect_error);
      } 

              $sql = "SELECT id, firstname, lastname, user_name, password FROM tbl_employees WHERE user_name='$strUserName' AND password='$strPassword' AND account_disabled='';";
              $result = $conn->query($sql);

          //Check and see if there are records avaiable.
          if ($result->num_rows > 0) {
              // output data of each row with a loop.
              while($row = $result->fetch_assoc()) {

                  //Store the info into a session variable.
                  $_SESSION['eid']      = $row["id"];
                  $_SESSION['firstname']    = $row["firstname"];
                  $_SESSION['lastname'] = $row["lastname"];

                  return $_SESSION["eid"];
                  //break; //Stop the loop process.
              }
          } else {
                //No records found prompt the user.
                  return "User name or Password was Incorrect! Please try again!";
          }
          db_disconn(); /*Close db*/
      }
  }
  ?>

页面：index.php

<?php
//Included file.
include 'modules/finishline_module.php';
include 'modules/validate_login.php';

//Turn on Error Report. True = On / False = Off
ErrorReporting(true);

//Grab Login Info and store into a variable.
if (isset($_POST["username"]) && !empty($_POST["username"]) &&     isset($_POST["password"]) && !empty($_POST["password"])) {
    $username = trim($_POST["username"]);
    $password = trim($_POST["password"]);
}

//Use to test username and password output.
    //if (isset($_POST["username"]) && !empty($_POST["username"]) &&     isset($_POST["password"]) && !empty($_POST["password"])) {
    //  echo $username." ".$password;
    //  exit();
    //}

//Check if a value was entered for username and password.
if (isset($username) && !empty($username) && isset($password) &&         !empty($password)) {
    //Call function to log user in.
    $strLogin = CheckLogin($username, $password);

    if ($strLogin != ""){
        header('Location: main.php');
    }
}
?>

<html>
<head>
<title>XXXXX Online</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<script Language="JavaScript">

var popup="This Site Copyright © protected 2015 XXXXXX all rights reserved."; function noway(go) 
{ if 
(document.all) { if (event.button == 2) { alert(popup); return false; } } if         (document.layers) 
{ if (go.which == 3) { alert(popup); return false; } } } if     (document.layers) 
{ document.captureEvents(Event.MOUSEDOWN); } document.onmousedown=noway; 

function validRequired(formField,fieldLabel)
{
  var result = true;

  if (formField.value == "")
  {
    alert('Please enter a value for the "' + fieldLabel +'" field.');

    formField.focus();

    result = false;
  }  
  return result;
}


function validateForm(theForm)
{

  if (!validRequired(theForm.username,"User name"))
   return false;

  if (!validRequired(theForm.password,"Password"))
    return false;

  return true;
}
</script>
        <link href="css/xxxxx.css" rel='stylesheet' type='text/css' />
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <script type="application/x-javascript"> addEventListener("load",     function() { setTimeout(hideURLbar, 0); }, false); function hideURLbar(){     window.scrollTo(0,1); } </script>
        <!--webfonts-->
        <link href='http://fonts.googleapis.com/css?    family=Open+Sans:600italic,400,300,600,700' rel='stylesheet' type='text/css'>
        <!--//webfonts-->
</head>
<body>

<!-----start-main---->
     <div class="main">
        <div class="login-form">
            <h1>Finish Line Member Login</h1>
                    <div class="head">
                        <img src="menubar/finish_line_logo_trans.gif" alt=""/>
                    </div>
                <form name="formlgin" method="post" action="index.php" onSubmit="return validateForm(this)" id="formlgin">

                        <input type="text" value="Knuckles02" name="username" class="text" placeholder="Username" onFocus="this.value = '';">
                        <input type="password" value="12345" name="password" placeholder="Password" onFocus="this.value = '';">
                        <div class="submit">
                            <input type="submit" onClick="myFunction()" value="LOGIN" >
                    </div>  
                </form>
            </div>
            <!--//End-login-form-->

        </div>
             <!-----//end-main---->
</body>
</html>

页面：main.php

<?php
//Included file.
include 'modules/finishline_module.php';
include 'modules/validate_login.php';

//Turn on Error Report. True = On / False = Off
ErrorReporting(true);
?>

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Finish Line CMS</title>
</head>

<body>

<?php
var_dump($_SESSION['firstname']);

if (isset($_SESSION['firstname']) && !empty($_SESSION['firstname']) &&     isset($_SESSION['lastname']) && !empty($_SESSION['lastname'])) {
    echo "Welcome Back: ".$_SESSION['firstname']." ".$_SESSION['lastname'];
}
?>

</body>
</html>

页面：validate_login.php

<?php
if (isset($_SESSION['eid']) && !empty($_SESSION['eid'])) {
    // Finally, destroy the session.
    session_destroy();
}
?>

问题：

刷新main.php时会话消失。

Answer 1

好的，我知道发生了什么以及为什么我在第一次工作后丢失我的会话然后在刷新页面时会丢失和错误。它与包含的“validate_login.php”页面有关。当我刷新导致错误未定义索引时，它正在破坏会话。以下是导致问题的代码：

 <?php
 if (isset($_SESSION['eid']) && !empty($_SESSION['eid'])) {
      // Finally, destroy the session.
      session_destroy();
 }
 ?>

未定义的会话索引PHP

1 个答案: