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PHP会话-不保存

[英]PHP Session - not saving

 原文  2013-11-02 01:46:35  3   2    php/ session/ header

问题描述

I'm working on an admin page for my site, but I found a problem. 我正在为我的网站创建管理页面，但发现了问题。 My code worked perfectly with Wamp (and still working in Chrome, but not for other people, or in other browsers). 我的代码与Wamp完美兼容（并且仍在Chrome中运行，但不适用于其他人或其他浏览器）。 So, the problem is that my site don't save the session variable after header redirecting. 因此，问题在于，我的网站在标头重定向后没有保存会话变量。 (Another thing I can't figure out is, that if I put the die or exit after the header the page just go blank, and you must refresh manually. Still it's only on the webserver.) （我不知道的另一件事是，如果我放置死块或在标题之后退出，页面将变为空白，并且必须手动刷新。仍然仅在Web服务器上。） 

<?php
session_start();
$log = $_GET['logout'];
$error = false;
//logout
if($log==true){
    unset($_SESSION['user']);
    header('Location: '.$_SERVER['PHP_SELF']);
    //die;
}
//login
if (isset($_POST['submit']) && !isset($_SESSION['user']) ){
    $file="login.xml";
    $xml=simplexml_load_file($file) or die ("Unable to load XMl file!");
    $nope=true;
    $givenuser = $_POST['username'];
    $givenpass = md5($_POST['password']);
    foreach($xml->user as $user){
        $username = $user->username;
        $password = $user->password;
        if ($givenuser == $username && $givenpass == $password){
            $_SESSION['user'] = $givenuser;
            $nope =false;
            header('Location: '. $_SERVER['PHP_SELF']);
            //die();
        }
    }
    if($nope) $error = true;
}
//succesful login
if (isset($_SESSION['user'])){
    ?>
    <html>
    <header><link rel="stylesheet" href="style.css" type="text/css" /></header>
    <body>
    <h1>
    <?php echo "Welcome ".$_SESSION['user']; ?>
    </h1>
    <div> 
        <a href="?">New page</a> 
        <a href="?logout=true">Logout</a>
    </div>
    <div id="menus">
        Pages:</br>
        <?php
            $file="../pages.xml";
            $xml=simplexml_load_file($file) or die ("Unable to load XMl file!");
            $index = 0;
            foreach($xml->xpath('//oldalneve') as $pagename){
                echo '<a href="?id='.$index.'">'.$pagename.'</a></br>';
                $index=$index+1;
            }
        ?>
    </div>
    <?php
        if(!is_numeric($_GET['id'])){
            $id=-1;
        }else{
            $id=(int)$_GET['id'];
        }
        if($id!=-1){
            $id=(int)$_GET['id'];
            if(isset($_POST['name']) && isset($_POST['body'])){
                if($_REQUEST['name'] !="" && $_REQUEST['body']!=""){
                    $file="../pages.xml";
                    $xml= simplexml_load_file($file) or die ("Unable to load XML file!");
                    $name = $_POST['name'];
                    $body = $_POST['body'];
                    $xml->page[$id]->oldalneve = $name;
                    $xml->page[$id]->body = $body;
                    $xml->asXML('../pages.xml');
                    header('Location: '.$_SERVER['PHP_SELF'].'?id='.$id);
                    //die;
                    }
            }
            $file="../pages.xml";
            $xml= simplexml_load_file($file);
            $nam=$xml->page[$id]->oldalneve;
            $val=$xml->page[$id]->body;
            ?>
            <div style="float:left;">
                <form name="input" method="post" action="" >
                    <label>Name</label></br>
                    <input type="text" name="name" style="width:250px" value="<?php echo $nam;?>"></br>
                    <label>Body</label></br>
                    <textarea cols="28" rows="10" name="body"><?php echo $val;?></textarea></br>
                    <input type="submit" name="submit" value="Küldés">
                </form>
            </div>
            </body>
            </html>
            <?php
        }else{ 
    ?>
            <div style="float:left;">
                <form name="input" method="post" action="" >
                    <fieldset><legend>Add page</legend>
                        <label>Name</label></br>
                        <input type="text" name="name" style="width:250px"></br>
                        <label>Body</label></br>
                        <textarea cols="28" rows="10"v name="body"></textarea></br>
                        <input type="submit" name="submit" value="Küldés">
                    </fieldset> 
                </form>
            </div>
            </body>
            </html>
            <?php
            if(isset($_POST['submit'])){
                if($_REQUEST['name'] !="" && $_REQUEST['body']!=""){
                    $file="../pages.xml";
                    $xml= simplexml_load_file($file) or die ("Unable to load XML file!");
                    $page=$xml->addChild('page');
                    $name = $_POST['name'];
                    $body = $_POST['body'];
                    $page->addChild('oldalneve', $name);
                    $page->addChild('body', $body);

                    $xml->asXML('../pages.xml');
                    header('Location: '.$_SERVER['PHP_SELF']);
                    //die;
                }
            }
        }
}else
{
    showLogin($error);
}
function showLogin($error){?>

    <form action="" method='post'>
        <label for="username">username</label>
        <input type="text" name="username" id="username"></br>
        <label for="password">password</label>
        <input type="password" name="password" id="password"></br>
        <?php
            if($error){
            echo "Invalid username or password".'</br>';
            }
        ?>
        <input type="submit" name="submit" value="submit">
    </form> 

<?php }

?>

The user can login and see the interface, but using one of the links will redirect him to the login screen (Session user is not saved). 用户可以登录并查看界面，但是使用链接之一会将其重定向到登录屏幕（未保存会话用户）。

Here is the phpinfo(): 这是phpinfo（）： 

session.auto_start  Off Off
session.bug_compat_42   On  On
session.bug_compat_warn On  On
session.cache_expire    180 180
session.cache_limiter   nocache nocache
session.cookie_domain   no value    no value
session.cookie_httponly Off Off
session.cookie_lifetime 0   0
session.cookie_path /   /
session.cookie_secure   Off Off
session.entropy_file    no value    no value
session.entropy_length  0   0
session.gc_divisor  100 100
session.gc_maxlifetime  1440    1440
session.gc_probability  1   1
session.hash_bits_per_character 4   4
session.hash_function   0   0
session.name    PHPSESSID   PHPSESSID
session.referer_check   no value    no value
session.save_handler    files   files
session.save_path   /tmp    /tmp
session.serialize_handler   php php
session.use_cookies On  On
session.use_only_cookies    Off Off
session.use_trans_sid   0   0

2 个解决方案

解决方案1
 0 已采纳  2013-11-02 02:12:29

I think Chafik is partly right. 我认为查菲克在某种程度上是对的。 

if($_GET['logout'] == true)

is a bad way to do this (a lot of thing would make that statement true). 这是一个不好的方法（很多事情会使该陈述成为事实）。 But he's incorrect in that === would solve it. 但是他不正确，因为===可以解决它。 Even if you set ?logout=true , $_GET['logout'] would contain the string true , not a boolean value so your === would wind up false ( "true" !== true ). 即使您设置?logout=true ， $_GET['logout']也会包含字符串 true ，而不是布尔值，因此您的===会变成false （ "true" ！== true ）。 I would use 我会用 

if(isset($_GET['logout']))

解决方案2
 0  2013-11-28 10:45:59

One of the Reason could be 原因之一可能是

  1. to include session_start(); 包括session_start（）; on the top of every page to get the values of variable SET in the SESSION through $_SESSION['example'], otherwise You will not be able to the session Variable values , 在每个页面的顶部通过$ _SESSION ['example']获取SESSION中的变量SET的值，否则您将无法进行会话变量值，

    2.A different Approach is to use session_start(); 2.一种不同的方法是使用session_start（）； inside config.php file and include that file on the top of the code of every page where sessions are required otherwise U will not be able to get the value of SESSION variable..!! 在config.php文件中，并将该文件包含在需要会话的每个页面的代码顶部，否则U将无法获取SESSION变量的值。

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