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我正在創建登錄頁面。當我第一次登錄時，它將我重定向到main.php。當它從var_dump得到這個：string（7）「Francis」這很好。但是，如果我刷新main.php，我得到這個通知：未定義的索引：在第20行path_to_file \ main.php中的名字 NULL（var_dump（$ _ SESSION ['firstname']）;）。爲什麼會話首次運行，然後在刷新時失敗/消失？未定義的會話索引PHP
下面是代碼：
頁：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 $_SESSION["eid"];
//break; //Stop the loop process.
}
} else {
//No records found prompt the user.
return "User name or Password was Incorrect! Please try again!";
}
db_disconn(); /*Close db*/
}
}
?>
頁：的index.php
<?php
//Included file.
include 'modules/finishline_module.php';
include 'modules/validate_login.php';
//Turn on Error Report. True = On/False = Off
ErrorReporting(true);
//Grab Login Info and store into a variable.
if (isset($_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>
頁：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']." ".$_SESSION['lastname'];
}
?>
</body>
</html>
頁：validate_login.php
<?php
if (isset($_SESSION['eid']) && !empty($_SESSION['eid'])) {
// Finally, destroy the session.
session_destroy();
}
?>
問題：刷新main.php時
會議消失。