删除POST数据，因此后退按钮将不会显示Document Expired [英] Removing POST data so back button won't display Document Expired

问题描述

当我的页面发布信息时，我将所有$_POST数据存储在单独的$_SESSION变量中.我知道此页面的后退按钮是设计用来显示Document Expired消息的.我的希望是使浏览器愚弄以为实际上根本没有任何$_POST数据，因此不要在返回时显示Document Expired消息.我正在强制彻底刷新页面，所以我担心接收旧数据，因为我已将其存储在会话中.

When my page does a post, I store all the $_POST data in a separate $_SESSION var. I know that a back button to this same page is by design to show the Document Expired message. My hope is to fool the browser into thinking that there was really never any $_POST data and so not to display the Document Expired message when coming back to it. I am forcing a complete refresh of the page so I am not worried about receiving old data, since I have it stored in the session.

我已尝试unset($_POST)希望此内容会保留在页面中.但是$_POST数据必须缓存/存储，并通过刷新或后退按钮返回.我想做的事可能吗?有什么想法吗?

I have tried to unset($_POST) hoping this will stay with the page. but the $_POST data must be cached / stored and returns with a refresh or back button. Is what I am trying to do possible? Any ideas?

*更新* 我的解决方案/答案发布在下面.它发布到一个单独的表单，该表单将重定向回原始表单以进行处理.不知道为什么要投反对票.它已经工作了好几个月了，我不再收到Document Expired消息.它还可以防止重复发布.

* UPDATE * My solution / answer is posted below. It posts to a separate form, which redirects back to the original form for processing. Not sure why the down vote. It has been working great for months and I no longer receive Document Expired messages. It also prevents duplicate posting.

推荐答案

*更新* 这是我的解决方法.

* UPDATE * Here's my solution.

我知道，使用post-redirect-get时，POST通常会返回到同一页面进行处理，然后再使用GET从表单重定向到另一个目标.但是，我需要能够返回到原始页面进行重新编辑(例如在文档模型中，用户可以保存正在进行的工作).因此，执行POST到第二页并重定向回原始页面是我摆脱"EXPIRED"消息的想法，因为编辑表单将没有与之关联的帖子数据.我已经扩展了它(未显示)以包括$ _FILE和其他情况(例如，也将它与a href一起使用).不知道为什么要投票.这已经工作了好几个月了，并且可以完成任务.我不再收到文档过期"消息.此外，所有$ _POST处理都在原始文件中完成.

I am aware that with post-redirect-get the POST is usually back to the same page for processing before being redirected away from the form with a GET to another destination. However, I need to be able to return to the original page for re-editing (as in a document model where the user can SAVE work in progress). Therefore doing the POST to a second page and redirecting back to the original was my idea of getting rid of the "EXPIRED" message since the editing form would not have post data associated with it. I have extended this (not shown) to include $_FILE and other situations (e.g. using it with a href as well). Not sure why the downvote. This has been working great for months now and accomplishes the task. I no longer receive "Document Expired" messages. In addition, all $_POST processing is accomplished in the original file.

testform.php

testform.php

<?php
session_start();
if (isset($_GET) && count($_GET)>0){
    // process get
    var_dump($_GET);
}
if (isset($_SESSION['post-copy'])){
    // return post vars to $_POST variable so can process as normal
    $_POST = $_SESSION['post-copy'];

    // unset the session var - with refresh can't double process
    unset($_SESSION['post-copy']);

    // process post vars
    var_dump($_POST);
}

?>

<form method='post' action='__b.php?redirect=<?php echo $_SERVER['PHP_SELF'] ?>&help=me' enctype='multipart/form-data'>
    <textarea name='descr' id='descr'>ABCD</textarea>
    <input type='submit' value='Go'>
</form>

redirect.php

redirect.php

<?php
if (!isset($_SESSION)){
    session_start();
}
if (isset($_POST)){
    $_SESSION['post-copy'] = $_POST;
}

// retrieve the url to return to
if (isset($_GET['redirect'])){
    $url = $_GET['redirect'];
}

// if multiple query string parameters passed in get, isolate the redirect so can build querystring with the rest
if (isset($_GET) && count($_GET) > 1){
    $get = $_GET;        
    foreach ($get as $key => $val){
        if ($key == 'redirect'){
            // remove from rest of passed get query string
            unset($get[$key]);
        }            
    }
    if (count($get) > 0){
        $url .= (strpos($url,"?")===false ? "?" : "&") . http_build_query($get);
    }

}

if ($url!==""){
    header("Location: " . $url);
}
?>

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