我只是在HP服务器中构建Centos 6.4，我使用的是PHP 5.3.3，Apache 2.2.15，Mysql 5.1.69。 当我想登录总是失败时，源代码如下：
index.php
<?
include "functions.php";
start_session();
session_destroy();
start_session();
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Please Login First</title>
<link href="Tampilan/css/bootstrap.min.css" rel="stylesheet" media="screen">
<link href="Tampilan/css/validationEngine.jquery.css" rel="stylesheet" type="text/css" />
<script type="text/javascript" src="Tampilan/js/jquery-1.9.1.min.js"></script>
<script type="text/javascript" src="Tampilan/js/jquery.validationEngine.js" ></script>
<script type="text/javascript" src="Tampilan/js/jquery.validationEngine-en.js" ></script>
<style type="text/css">
.myTableStyle {
position: absolute;
top: 45%;
left: 37%;
}
#full-screen-background-image {
z-index: -999;
width: 100%;
height: auto;
position: fixed;
top: 0;
left: 0;
}
#wrapper {
position: relative;
width: 800px;
min-height: 400px;
margin: 100px auto;
color: #333;
}
.overlay-text {
position: absolute;
top: 20px;
left: 225px;
font-size: 38.5px;
font-weight: bold;
color: #ddd;
font-family: "Palatino Linotype", "Book Antiqua", Palatino, serif;
}
</style>
<script src="content/md5.js"></script>
<script>
function cek()
{
if(!document.form1.username.value)
{
document.form1.username.focus();
window.alert("Please Fill In The Username");
}
else if(!document.form1.password.value)
{
document.form1.password.focus();
window.alert("Please Fill In The Password");
}
else {
document.form2.username.value=document.form1.username.value;
document.form2.password.value=calcMD5(document.form1.password.value);
document.form2.submit();
}
}
</script>
<link href="style.css" rel="stylesheet" type="text/css">
<link href="bootstrap.min.css" rel="stylesheet" type="text/css">
<noscript>
<div class="pagetitle">This page cannot be loaded properly because your browser has been set to deny the usage of Javascript. Please enable the Javascript support at your browser in order to continue</div>
<meta http-equiv="Refresh" content="0;noscript.php"/>
</noscript>
</head>
<div class="all-page">
<div class="page-header">
<!--<img alt="image" src="Tampilan/img/Stema1.jpg" style="height: 300px;width: 100%;z-index: -1;"/>!-->
<p class="overlay-text">
SIS Admission
</p>
<body onload="document.form1.username.focus()">
<form name="form1" action="javascript:cek()">
<table border="0" cellspacing="0" cellpadding="0" width="100%" height="100%">
<tr>
<td width="100%" valign="middle" align="center">
<table border="0" align="center" width="300" cellpadding="0" cellspacing="0">
<tr>
<td align="center" colspan="2" height="50"><div class="medTitle">Please Login</div></td>
</tr>
<tr>
<td align="center" width="120" height="30"><div class="smallTitle">Username </div></td>
<td align="left"><input type="text" name="username" class="input"/></td>
</tr>
<tr>
<td align="center" height="30"><div class="smallTitle">Password </div></td>
<td align="left"><input type="password" class="input" name="password"/></td>
</tr>
<tr>
<td align="center" colspan="2" height="40"><input type="submit" class="button" value="Login"/></td>
</tr>
</table>
</td>
</tr>
</table>
</form>
<form name="form2" action="login.php" method="post">
<input type="hidden" name="username"/>
<input type="hidden" name="password"/>
<input type="hidden" name="sess" value="<?=session_id();?>"/>
</form>
<div class="well navbar navbar-fixed-bottom">
<center>
Copyright © 2013 <a href="http://www.stellamaris.co.id/" target="_blank">Saint John's Catholic School</a> Developed by IT Department Of Saint John's Catholic School<a href="javascript:pergiKe('credit')"></a>. All Rights Reserved.
</center>
</div>
</body>
</html>
login.php
<?
include "functions.php";
if(!isset($_POST['username'])||!isset($_POST['password'])||!isset($_POST['sess'])){
?>
<script>
alert("Silahkan masukan username/password anda");
location.href="index.php";
</script>
<?
}
else
{
session_start();
$session_id=$_POST['sess'];
if($session_id!=session_id()){
?>
<script>
alert("Untuk dapat menggunakan website ini, browser anda haruslah menerima cookie yang diberikan");
location.href="index.php";
</script>
<?
}
else{
$username=$_POST['username'];
$password=$_POST['password'];
connect_local();
$pola_password="^[a-zA-Z0-9]{1,}$";
$pola_username="^[a-zA-Z0-9_]{1,}$";
if(!ereg($pola_username,$username)){
?>
<script>
alert("Silahkan masukan username");
location.href="index.php";
</script>
<?
}
else if(!ereg($pola_password,$password)){
?>
<script>
alert("Silahkan masukan password");
location.href="index.php";
</script>
<?
}
else{
$query="select * from ms_user where username='$username' and password='$password'";
$result=mysql_query($query);
if(mysql_num_rows($result)>1) {
?>
<script>
alert("Username/password tidak terdaftar");
location.href="index.php";
</script>
<?
}
else if(mysql_num_rows($result)==1){
$hasil=mysql_fetch_array($result);
if($hasil['status']==0){
?>
<script>
alert("Username/password tidak terdaftar");
location.href="index.php";
</script>
<?
}
else{
$username=$hasil['username'];
$id_ms_user=$hasil['id_ms_user'];
$status=$hasil['status'];
$_SESSION['ses_username']=$username;
$_SESSION['ses_user_id']=$id_ms_user;
$_SESSION['ses_access_level']=$status;
header("location:main.php");
}
}
else {
?>
<script>
alert("Username/password tidak terdaftar");
location.href="index.php";
</script>
<?
}
}
}
}
?>
在使用PHP 5.1.6，Apache 2.2.3和Mysql 5.0.24a之前，我没有这样的问题。
答案 0 :(得分：2)
你在使用那段代码
start_session();
session_destroy();
start_session();
删除所有这些并将其替换为
session_start();
if($_SESSION['ses_username'] == "")
{
session_destroy();
}
答案 1 :(得分：0)
替换
start_session();
通过 -
session_start();
答案 2 :(得分：0)
session_start（）非start_session()
或者你可以在 index.php
<?
include "functions.php";
if(!isset($_SESSION))
{
session_start();
}
if($_SESSION['ses_username'] == '')
{
session_destroy();
}
?>