blocks|key|870745|text|我认为在PHP中实现这一点的唯一方法是在页面上的每个链接上附加一个一次性令牌，并在第一次使用时终止它们。然而，这需要将它们存储在某个地方，例如数据库或缓存。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|870746|会话也可以工作，为每个页面加载生成一个唯一的ID。|870747|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

<p>The only way I can think of this being done in PHP is to append a one-time token to each and every link on the page, and expire them on the first use. That would however require storing them somewhere, for example a database or a cache. </p>

<p>Sessions could work too, with a unique ID generated for each page load.</p>


blocks|key|1257709|text|我会用JavaScript和unload+event这样做。然后，当用户离开页面时，它的最后一个动作是清除DOM或存储一些cookie，这些cookie允许您测试页面是后退按钮还是返回页面的链接的结果|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1257710|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.mozilla.org/en-US/docs/DOM/window.onunload^0|E|C|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

<p>I would do this with JavaScript and the <a href="https://developer.mozilla.org/en-US/docs/DOM/window.onunload" rel="nofollow">unload event</a>. Then as the user navigates off of the page it's last act is to clear the DOM or store some cookie that will let you test if the page is the result of a back button or a link back to the page</p>


blocks|key|870722|text|设置一个密钥，例如uniqid()，并将其作为GET变量放在链接中。然后，当用户下一次加载页面时，您应该期待该键。例如，您可以将其保存在$_SESSION中，以确保服务器知道会发生什么。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|870723|entityMap^0|9|8|N|3|1W|9|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|O|8|@]|D|@]|E|$]]]|G|$]]

<p>Set a key, such as <code>uniqid()</code>, and put it as a <code>GET</code> variable in the link. Then, the next time that user loads a page, you should expect that key. You can save it in <code>$_SESSION</code>, for example, to make sure the server knows what to expect.</p>


blocks|key|1257730|text|我真的认为这是一个坏主意main，因为它不会帮助你的网站速度。大多数浏览器在back和forward期间使用信息的缓存副本|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1257731|其次，这意味着您需要生成uniqid并存储它。你可以使用memcache|1257732|下面是我认为您的代码应该是什么样子(注意:不能在生产中使用)|BOLD|1257733|<?php

/**
+*+Make+Sure+the+Broswer+does+to+cache+a+copy
+*/
header('Expires:+Sat,+26+Jul+1997+05:00:00+GMT');
header('Last-Modified:+'+.+gmdate('D,+d+M+Y+H:i:s')+.+'+GMT');
header('Cache-Control:+no-store,+no-cache,+must-revalidate');
header('Cache-Control:+post-check=0,+pre-check=0',+false);
header('Pragma:+no-cache');

//+Use+Fast+Storage
$memcache+=+new+Memcache();
$memcache->addserver("127.0.0.1");

//+Just+a+sample+link+to+know+what+has+been+clicked
$link+=+isset($_GET['link'])+?+$_GET['link']+:+null;
$link+=+basename($link);

try+{

++++//+uniqid+per+page
++++$uid+=+isset($_GET['uid'])+?+$_GET['uid']+:+false;

++++if+(!+$uid)+{
++++++++throw+new+Exception("Invalid+Link");
++++}
++++if+($memcache->get($uid))
++++++++throw+new+Exception("Refresh+Detected");

++++++++//+Add+the+link+as+used
++++$memcache->add($uid,+1,+null,+600);+//+this+would+be+deleted+in+10+mins

++++//+Simple+Return+message
++++$message+=+"Clicked:"+.+ucwords($link);
}+catch+(+Exception+$e+)+{

++++//+Simple+Error+Message
++++$message+=+$e->getMessage();
++++//+do+somthing+usefull+here
}

//+New+Ramdom+uinqid
$uid+=+bin2hex(mcrypt_create_iv(50,+MCRYPT_DEV_URANDOM));

?>

<html>

<head>
<title><?php+echo+$message+?></title>
<script+type="text/javascript"
++++src="http:////ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>

<script+type="text/javascript">
$(function(){

++++//+Load+all+links
++++$('a').each(function()+{

++++++++//+Check+with+correspond+to+localhost+..+since+that+what+am+using
++++++++if(this.href.match("/localhost/"))
++++++++{
++++++++++++//+Replace+all+links
++++++++++++$(this).attr('href',+'http://localhost/lab/stackoverflow/a.php?uid=<?php+echo+$uid+;?>&link='+%2B+this.href);
++++++++}
++++});
});
</script>
</head>

<body>
++++<h3><?php+echo+$message+?></h3>
++++<ul>
++++++++<li><a+href="index">Index</a></li>
++++++++<li><a+href="home">Home</a></li>
++++++++<li><a+href="about">About</a></li>
++++++++<li><a+href="http://google.com">Google</a></li>

++++</ul>


</body>
</html>|code-block|syntax|javascript|1257734|entityMap^0|12|4|17|7|0|S|8|0|I|8|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@$9|S|A|T|B|C]|$9|U|A|V|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|Z|8|@$9|10|A|11|B|J]]|D|@]|E|$]]|$1|K|3|L|5|M|7|12|8|@]|D|@]|E|$N|O]]|$1|P|3|-4|5|6|7|13|8|@]|D|@]|E|$]]]|Q|$]]

<p>I really think this is a bad idea main because it does not help your site speed. Most browser use cached copy of information during <code>back</code> and <code>forward</code></p>

<p>Secondly which means you need to generate uniqid and store it .. well you can so that with <code>memcache</code> </p>

<p>Here is what i think your code would look like (<strong><em>Note: Not to be used in production</em></strong>)</p>

<pre><code>&lt;?php

/**
 * Make Sure the Broswer does to cache a copy
 */
header('Expires: Sat, 26 Jul 1997 05:00:00 GMT');
header('Last-Modified: ' . gmdate('D, d M Y H:i:s') . ' GMT');
header('Cache-Control: no-store, no-cache, must-revalidate');
header('Cache-Control: post-check=0, pre-check=0', false);
header('Pragma: no-cache');

// Use Fast Storage
$memcache = new Memcache();
$memcache-&gt;addserver("127.0.0.1");

// Just a sample link to know what has been clicked
$link = isset($_GET['link']) ? $_GET['link'] : null;
$link = basename($link);

try {

    // uniqid per page
    $uid = isset($_GET['uid']) ? $_GET['uid'] : false;

    if (! $uid) {
        throw new Exception("Invalid Link");
    }
    if ($memcache-&gt;get($uid))
        throw new Exception("Refresh Detected");

        // Add the link as used
    $memcache-&gt;add($uid, 1, null, 600); // this would be deleted in 10 mins

    // Simple Return message
    $message = "Clicked:" . ucwords($link);
} catch ( Exception $e ) {

    // Simple Error Message
    $message = $e-&gt;getMessage();
    // do somthing usefull here
}

// New Ramdom uinqid
$uid = bin2hex(mcrypt_create_iv(50, MCRYPT_DEV_URANDOM));

?&gt;

&lt;html&gt;

&lt;head&gt;
&lt;title&gt;&lt;?php echo $message ?&gt;&lt;/title&gt;
&lt;script type="text/javascript"
    src="http:////ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"&gt;&lt;/script&gt;

&lt;script type="text/javascript"&gt;
$(function(){

    // Load all links
    $('a').each(function() {

        // Check with correspond to localhost .. since that what am using
        if(this.href.match("/localhost/"))
        {
            // Replace all links
            $(this).attr('href', 'http://localhost/lab/stackoverflow/a.php?uid=&lt;?php echo $uid ;?&gt;&amp;link=' + this.href);
        }
    });
});
&lt;/script&gt;
&lt;/head&gt;

&lt;body&gt;
    &lt;h3&gt;&lt;?php echo $message ?&gt;&lt;/h3&gt;
    &lt;ul&gt;
        &lt;li&gt;&lt;a href="index"&gt;Index&lt;/a&gt;&lt;/li&gt;
        &lt;li&gt;&lt;a href="home"&gt;Home&lt;/a&gt;&lt;/li&gt;
        &lt;li&gt;&lt;a href="about"&gt;About&lt;/a&gt;&lt;/li&gt;
        &lt;li&gt;&lt;a href="http://google.com"&gt;Google&lt;/a&gt;&lt;/li&gt;

    &lt;/ul&gt;


&lt;/body&gt;
&lt;/html&gt;
</code></pre>


<p>I want to make a page on which if user press back,forward or refresh the page it should says invalid page and if user clicks on the link available on that page it should says valid page.</p>

<p>I don't want to disable back and forward button.
It should be done in PHP</p>

<p>thanks in advance.</p>


Browser's back, forward, refresh(F5 or ctrl+R) check in PHP?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我想使一个页面上，如果用户按回，前进或刷新页面，它应该说无效的页面，如果用户点击该页面上可用的链接，它应该说有效的页面。我不想禁用后退和前进按钮。它应该在PHP中完成提前谢谢。

问浏览器的后退，前进，刷新(F5或ctrl+R)检查在PHP？
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