blocks|key|265619|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data|265620|检查用户访问脚本时是否达到限制|ordered-list-item|265621|，当用户存在(或脚本结束)时将其添加到DB|265622|，将其从DB|265623|中删除|265624|如果没有文件或数据库，则无法将此文件保存到其他地方|265625|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|-4|4|5|6|N|7|@]|8|@]|9|$]]|$1|A|3|B|4|C|6|O|7|@]|8|@]|9|$]]|$1|D|3|E|4|C|6|P|7|@]|8|@]|9|$]]|$1|F|3|G|4|C|6|Q|7|@]|8|@]|9|$]]|$1|H|3|I|4|5|6|R|7|@]|8|@]|9|$]]|$1|J|3|K|4|5|6|S|7|@]|8|@]|9|$]]|$1|L|3|-4|4|5|6|T|7|@]|8|@]|9|$]]]|M|$]]

<ol>
<li>check if limit is reached</li>
<li>when user access script, add him to DB</li>
<li>when user exists (or script ends), remove him from DB</li>
</ol>

there's no way to save this somewhere else for everyone without file nor DB

blocks|key|2068515|text|你的前提条件是相当严格的。内存不在脚本之间共享(或not+normally)，我们不能使用文件或数据库:这实际上没有可用于共享信息的公共空间，所以每次都必须计算信息。您最好的选择可能是检查正在运行的进程，确定哪些进程属于您的脚本，并对它们进行计数。您提到的cron建议使用Unix，这使事情变得更容易。PHP可能允许在这种程度上控制进程的执行，作为最后一个资源，您始终可以从POSIX运行ps命令。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2068516|entityMap|0|LINK|mutability|MUTABLE|url|http://www.php.net/manual/en/intro.shmop.php|1|http://www.php.net/manual/en/intro.sem.php|2|http://www.php.net/manual/en/book.posix.php|3|http://unixhelp.ed.ac.uk/CGI/man-cgi?ps^0|P|3|0|T|8|1|57|5|2|5E|2|3|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@$A|S|B|T|1|U]|$A|V|B|W|1|X]|$A|Y|B|Z|1|10]|$A|11|B|12|1|13]]|C|$]]|$1|D|3|-4|5|6|7|14|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]|L|$5|G|H|I|C|$J|M]]|N|$5|G|H|I|C|$J|O]]|P|$5|G|H|I|C|$J|Q]]]]

Your preconditions are pretty restrictive. Memory is not (or <a href="http://www.php.net/manual/en/intro.shmop.php" rel="nofollow">not</a> <a href="http://www.php.net/manual/en/intro.sem.php" rel="nofollow">normally</a>) shared between scripts and we cannot use files or databases: that virtually leaves no common space available to share information, so you have to calculate the information every time. Your best option is probably to inspect the running processes, identify which ones belong to your script and count them. Your mention to cron suggests Unix, which makes things easier. The <a href="http://www.php.net/manual/en/book.posix.php" rel="nofollow">POSIX</a> extension probably allows to control process execution to this degree and, as last resource, you can always run the <a href="http://unixhelp.ed.ac.uk/CGI/man-cgi?ps" rel="nofollow">ps</a> command from PHP.

blocks|key|2068560|text|据我所知，如果没有数据库或文件，这是不可能的。相反，如果您有访问服务器的权限(根访问权限)，则可以使用ps命令(如果正在运行linux+OS)检查脚本是否已经在运行，如果已经运行，则可以查看它有多少实例。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2068561|entityMap^0|1F|2|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

Without DB or files this isn't possible as far as I am aware of. Instead, if you have access to the server (root access) you could check with the <code>ps</code> command (if running a linux OS) if the script is already running and if so, you could see how much instances of it.

blocks|key|266356|text|将变量写入特定的内存地址，并使用诸如计数之类的信息对该地址进行读写，可能会起作用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|266357|有关IPC+(进程间通信)的一篇(旧)文章可能会对您有所帮助|266358|http://zez.org/article/articleview/46/|offset|length|266359|出于兴趣，为什么您不想使用文件或数据库？|266360|另一种解决方案(尽管在技术上很可能使用文件或数据库)是强制脚本使用特定的会话ID。|266361|<?php

$maximum+=+1;

session_id(md5('myscript'));
session_start();

if(+!isset(+$_SESSION['count']+)+)+{
++++$_SESSION['count']+=+1;
}+else+{
++++if(+$_SESSION['count']+>=+$maximum+)+{
++++++++die(+"too+many+processes+running"+);
++++}+else+{
++++++++$_SESSION['count']%2B%2B;
++++}
}

session_write_close();

//+simulate+running+something
sleep(10);

session_id(md5('myscript'));
session_start();

$_SESSION['count']--;

session_write_close();

echo+"<br+/>executed";

?>|code-block|syntax|javascript|266362|注在上面的示例中，对session_write_close()的调用很重要，因为脚本的执行将阻止计数器递增，直到它以其他方式完成。然后，当它关闭它时，它需要重新打开以减少计数器。|266363|显然，由于会话重新打开，脚本中的任何输出都需要进行缓冲(请参见http://www.php.net/ob_start)，以防止标头已经发送错误|266364|entityMap|0|LINK|mutability|MUTABLE|url|1|http://www.php.net/ob_start^0|0|0|0|12|0|0|0|0|0|0|V|R|1|0^^$0|@$1|2|3|4|5|6|7|13|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|14|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|15|8|@]|9|@$F|16|G|17|1|18]]|A|$]]|$1|H|3|I|5|6|7|19|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|1A|8|@]|9|@]|A|$]]|$1|L|3|M|5|N|7|1B|8|@]|9|@]|A|$O|P]]|$1|Q|3|R|5|6|7|1C|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|1D|8|@]|9|@$F|1E|G|1F|1|1G]]|A|$]]|$1|U|3|-4|5|6|7|1H|8|@]|9|@]|A|$]]]|V|$W|$5|X|Y|Z|A|$10|E]]|11|$5|X|Y|Z|A|$10|12]]]]

Writing the variables to a specific memory address and reading and writing to/from that address with information such as a count might work.

An (old) article on IPC (inter process communication) might help you

<a href="http://zez.org/article/articleview/46/" rel="nofollow">http://zez.org/article/articleview/46/</a>

Out of interest why is it you don't want to use files or a database?

Another solution (despite more than likely technically using files or a database) would be to force the script to use a specific session ID.

<pre><code>&lt;?php

$maximum = 1;

session_id(md5('myscript'));
session_start();

if( !isset( $_SESSION['count'] ) ) {
 $_SESSION['count'] = 1;
} else {
 if( $_SESSION['count'] &gt;= $maximum ) {
 die( "too many processes running" );
 } else {
 $_SESSION['count']++;
 }
}

session_write_close();

// simulate running something
sleep(10);

session_id(md5('myscript'));
session_start();

$_SESSION['count']--;

session_write_close();

echo "&lt;br /&gt;executed";

?&gt;
</code></pre>

Note in the example above, the call to session_write_close() is important because the execution of the script will prevent the counter being incremented until it finishes otherwise. And then as it closes it, it needs reopening to decrement the counter.

Obviously because of the session reopening, any output from the script would need to be buffered (see <a href="http://www.php.net/ob_start" rel="nofollow">http://www.php.net/ob_start</a>) to prevent headers already sent errors

I want to define a variable in php with in a global scope. That variable should be accessible for each user, so it should not depend on the session. 

I want to do something like the following: I have a php script, and that script usually takes about 5 to 15 minutes to execute, but it can take more than one hour in some special cases. This script is being run using a cron job with a 15 minutes interval. This script can also be run manually by any user.

Now it's possible to run any number of scripts at the same time. I want to limit this number of scripts.

So, I want a variable to store the number of currently executing scripts. I don't want to use a DB or files to store a single value.

Thanks in advance.

I want to define a variable with superglobal scope 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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我想在php中定义一个全局范围的变量。该变量应该是每个用户都可以访问的，因此它不应该依赖于会话。我想做一些类似如下的事情:我有一个php脚本，这个脚本通常需要5到15分钟来执行，但在某些特殊情况下可能需要一个多小时。此脚本使用cron作业运行，运行时间间隔为15分钟。此脚本也可以由任何用户手动运行。现在可以同时运行任意...

问我想在php中定义一个超全局范围的变量。
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问我想在php中定义一个超全局范围的变量。EN