blocks|key|5461|text|为此，您应该使用$_SESSION。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|5462|有关解释，请参见这里，但基本上需要执行以下操作：|5463|session_start();
$SpeedTest+=+isset($_SESSION['speedTest'])+?+$_SESSION['speedTest']+:+0;

if+($APIkbpersec+<+30)
{
++++echo+("Slow+speed");
++++$SpeedTest--;
}

if+($APIkbpersec+>+30)
{
++++echo+("High+speed");
++++$SpeedTest%2B%2B;
}
$_SESSION['speedTest']+=+$SpeedTest;

echo+$SpeedTest;|code-block|syntax|javascript|5464|entityMap|0|LINK|mutability|MUTABLE|url|http://www.php.net/manual/en/session.examples.basic.php^0|8|9|0|8|2|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|X|8|@]|D|@$9|Y|A|Z|1|10]]|E|$]]|$1|H|3|I|5|J|7|11|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

You should use <code>$_SESSION</code> for that purpose. 
See <a href="http://www.php.net/manual/en/session.examples.basic.php" rel="nofollow">HERE</a> for an explanation, but basically you would need to do the following:

<pre><code>session_start();
$SpeedTest = isset($_SESSION['speedTest']) ? $_SESSION['speedTest'] : 0;

if ($APIkbpersec &lt; 30)
{
 echo ("Slow speed");
 $SpeedTest--;
}

if ($APIkbpersec &gt; 30)
{
 echo ("High speed");
 $SpeedTest++;
}
$_SESSION['speedTest'] = $SpeedTest;

echo $SpeedTest;
</code></pre>

blocks|key|34731|text|因为HTTP请求是无状态的，所以正在重置它。每个AJAX调用都是PHP脚本的一个孤立事件。要使变量持久，必须将其存储在$_SESSION中。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|34732|您还没有显示用于将其写入文本文件的代码，但除非您需要它在用户会话之后持久化，否则这是错误的方法。最好使用$_SESSION为您服务。如果您确实需要长期持久化，则应该使用数据库来代替。|34733|session_start();

//+Initialize+the+variable+if+it+doesn't+exist+yet
if+(!isset($_SESSION['SpeedTest']))+{
++$_SESSION['SpeedTest']+=+0;
}

echo+(" ");
if+($APIkbpersec+<+30)+{
++echo+("Slow+speed");
++$_SESSION['SpeedTest']--;
}
if+($APIkbpersec+>+30)+{
++echo+("High+speed");
++$_SESSION['SpeedTest']%2B%2B;
}
echo+$_SESSION['SpeedTest'];|code-block|syntax|javascript|34734|entityMap^0|1N|9|0|1G|9|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|R|8|@$9|S|A|T|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|U|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|N|$]]

It's being reset because the HTTP request is stateless. Each AJAX call is an isolated event to a PHP script. To make the variable persist, it has to be stored in <code>$_SESSION</code>.

You have not shown the code you're using to write it to a text file, but unless you need it to persist beyond a user session, that's the wrong approach. You're better served using <code>$_SESSION</code>. If you do need long-term persistence, you should use a database instead.

<pre><code>session_start();

// Initialize the variable if it doesn't exist yet
if (!isset($_SESSION['SpeedTest'])) {
 $_SESSION['SpeedTest'] = 0;
}

echo ("&lt;br/&gt;");
if ($APIkbpersec &lt; 30) {
 echo ("Slow speed");
 $_SESSION['SpeedTest']--;
}
if ($APIkbpersec &gt; 30) {
 echo ("High speed");
 $_SESSION['SpeedTest']++;
}
echo $_SESSION['SpeedTest'];
</code></pre>

blocks|key|1861908|text|以下任一项：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1861909|在响应中返回$SpeedTest并来回传递它。|unordered-list-item|offset|length|style|CODE|1861910|使用某种持久性存储，如cookie或PHP会话。|1861911|两者都很容易实现。如果您需要持久化存储，我建议您使用cookie，因为JS和PHP都可以共享它。会议，虽然显然是候选人，但在这种情况下有点过火--+IMO。|1861912|entityMap^0|0|6|A|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@$E|Q|F|R|G|H]]|9|@]|A|$]]|$1|I|3|J|5|D|7|S|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|T|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|U|8|@]|9|@]|A|$]]]|N|$]]

Either:

<ul>
<li>Return <code>$SpeedTest</code> in the response and pass it back and forth.</li>
<li>Use some kind of persistent storage such as a cookie or PHP sessions.</li>
</ul>

Both are pretty easy to implement. If you want with persistent storage, I'd suggest a cookie as both JS and PHP could share it. Session, although the obvious candidate, are a bit overkill in this case - IMO.

blocks|key|1861926|text|如果这是您所有的代码，那么问题就很简单。每次运行脚本时，都会初始化所有变量的值。对于您的情况，这意味着$SpeedTest的值不会持久-每次调用脚本时都会将其重置为零。您可以使用@Michael建议的会话(可能是我的建议)，从文本文件或数据库中读取值，然后写出一个新值，或者将$SpeedTest的值返回到AJAX脚本，并将其作为参数传递回php脚本。其中每一个都有不同的优点和缺点，但是使用$_SESSION超级全局很容易，并且对代码几乎不需要修改。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1861927|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

If this is all of your code, the problem is simple. Each time the script is run, the values of all the variables are initialized. For your case, this means that the value of $SpeedTest does not persist - it's reset to zero each time the script is called. You can use a session as @Michael suggests (probably my recommendation), read the value out from a text file or database and then write a new value out, or you could return the value of $SpeedTest to your AJAX script and pass it back into the php script as a parameter. Each of these have various advantages and disadvantages, but using the $_SESSION superglobal is easy to do and takes little modification to your code.

blocks|key|1861986|text|如果要对文件执行此操作，可以使用单个文件来存储变量的单个全局值：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1861987|从文件(医生来了)读取数据：|offset|length|1861988|$data=+file_get_contents('file.txt');|code-block|syntax|javascript|1861989|将数据放入文件(医生来了)|1861990|$bytesWritten+=+file_put_contents(+$data+);|1861991|否则，您可以按照其他建议使用会话或数据库。|1861992|没有cookie或会话，您就不可能有真正的“每个用户”解决方案，因此，如果您需要使用其他答案，或者使用会话/文件的混合解决方案。|1861993|如果您使用请求解决方案(这种带有POST或GET变量的乒乓)，请始终注意，因为用户可以更改这些变量。|1861994|其他要记住的事情：|1861995|文件和数据库记录直到删除为止(因此您可能必须管理未删除的文件或记录)。|ordered-list-item|1861996|会话持续时间是在服务器内配置的(因此，如果需要长期持久性，会话持续时间可能太短)。|1861997|通常，数据库比文件更好(执行更多的任务并为应用程序提供更大的可伸缩性)，但在某些情况下，文件解决方案更快(测试)，特别是如果数据库驻留在另一个主机上，并且不在与not服务器相同的主机上。|1861998|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/manual/en/function.file-get-contents.php|1|http://www.php.net/manual/en/function.file-put-contents.php|2|http://www.php.net/manual/en/book.session.php|3|http://www.php.net/manual/en/class.pdo.php^0|0|4|4|0|0|0|8|4|1|0|0|E|2|2|H|3|3|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1I|8|@]|9|@$D|1J|E|1K|1|1L]]|A|$]]|$1|F|3|G|5|H|7|1M|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|1N|8|@]|9|@$D|1O|E|1P|1|1Q]]|A|$]]|$1|M|3|N|5|H|7|1R|8|@]|9|@]|A|$I|J]]|$1|O|3|P|5|6|7|1S|8|@]|9|@$D|1T|E|1U|1|1V]|$D|1W|E|1X|1|1Y]]|A|$]]|$1|Q|3|R|5|6|7|1Z|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|20|8|@]|9|@]|A|$]]|$1|U|3|V|5|6|7|21|8|@]|9|@]|A|$]]|$1|W|3|X|5|Y|7|22|8|@]|9|@]|A|$]]|$1|Z|3|10|5|Y|7|23|8|@]|9|@]|A|$]]|$1|11|3|12|5|Y|7|24|8|@]|9|@]|A|$]]|$1|13|3|-4|5|6|7|25|8|@]|9|@]|A|$]]]|14|$15|$5|16|17|18|A|$19|1A]]|1B|$5|16|17|18|A|$19|1C]]|1D|$5|16|17|18|A|$19|1E]]|1F|$5|16|17|18|A|$19|1G]]]]

If you want to do it with files you can use a single file to store a single global value for your variable: 
Read data from file (<a href="http://php.net/manual/en/function.file-get-contents.php" rel="nofollow">docs here</a>):

<pre><code>$data= file_get_contents('file.txt');
</code></pre>

Put data into file (<a href="http://www.php.net/manual/en/function.file-put-contents.php" rel="nofollow">docs here</a>)

<pre><code>$bytesWritten = file_put_contents( $data );
</code></pre>

Else you can use <a href="http://www.php.net/manual/en/book.session.php" rel="nofollow">sessions</a> or <a href="http://www.php.net/manual/en/class.pdo.php" rel="nofollow">database</a> as other suggested. 
Without cookies or sessions you cannot have a real "per user" solution so if you need that stick with other answers or use an hybrid solution with sessions/files 
If you use the request solution (that kind of ping-pong with POST or GET variables) always pay attention because those variables can be altered by users. 
Other things to remember:

<ol>
<li>Files and database records last until you delete them (so maybe you have to manage undeleted files or records).</li>
<li>Session duration is configured within your server (so they can last too short if you need long term persistency).</li>
<li>Usually database are better than files (the do more tasks and provide your application more scalability) but in some cases files solution is faster (tested) specially if your database resides in another host and is not on the same host as your webserver.</li>
</ol>

here is my code

<pre><code>echo ("&lt;br/&gt;");
if ($APIkbpersec &lt; 30) {
 global $SpeedTest;
 echo ("Slow speed");
 $SpeedTest--;
}
if ($APIkbpersec &gt; 30) {
 global $SpeedTest;
 echo ("High speed");
 $SpeedTest++;
}
echo $SpeedTest;
</code></pre>

the page this code is in gets reloaded every second with AJAX and the <code>$APIkbpersec</code> changes between 40 and 0.

I basically want to have a variable (<code>$SpeedTest</code>) increase or decrese depending on what <code>$APIkbpersec</code> is.

<ul>
<li>if <code>$APIkbpersec</code> is less than 30, I want <code>$SpeedTest</code> to decrease by 1 every refresh to a minimum of 0.</li>
<li>if <code>$APIkbpersec</code> is greaterthan 30, I want <code>$SpeedTest</code> to increase from by 1 every refresh to a maximum of 10.</li>
</ul>

the problem is I dont know what the porblem is....Im currently trying to write <code>$SpeedTest</code> to a txt file so I can read it in every refresh to do the maths on it every refresh without it being reset in PHP

any help would be appreciated

PHP variable question

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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这是我的密码echo (" ");if ($APIkbpersec < 30) { global $SpeedTest; echo ("Slow speed"); $SpeedTest--;}if ($APIkbpersec > 30) { global $SpeedTest; e...

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