blocks|key|3041114|text|1440用于将秒转换为小时/天的时间计算。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3041115|3041116|1天=+24小时(小时*+24+=1天)|unordered-list-item|3041117|天=+1440分钟(分钟*+60+*+24+=1天)|3041118|天=+86400秒(秒*+60+*+1440+=1天)|3041119|3041120|示例：|3041121|3041122|+9天*+60+=540X1440=+777600秒|blockquote|3041123|3041124|3041125|反之亦然：|3041126|3041127|+777600秒/+1440+=+540+/+60+=9天|3041128|3041129|entityMap^0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|11|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|12|8|@]|9|@]|A|$]]|$1|F|3|G|5|E|7|13|8|@]|9|@]|A|$]]|$1|H|3|I|5|E|7|14|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|15|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|16|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|17|8|@]|9|@]|A|$]]|$1|N|3|O|5|P|7|18|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|19|8|@]|9|@]|A|$]]|$1|R|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|1B|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|1C|8|@]|9|@]|A|$]]|$1|V|3|W|5|P|7|1D|8|@]|9|@]|A|$]]|$1|X|3|-4|5|6|7|1E|8|@]|9|@]|A|$]]|$1|Y|3|-4|5|6|7|1F|8|@]|9|@]|A|$]]]|Z|$]]

1440 is used in a time calculation turning seconds into hours/days.

<ul>
<li>1 day = 24 hours ( hours * 24 = 1 day )</li>
<li>day = 1440 minutes ( minutes * 60 * 24 = 1 day )</li>
<li>day = 86400 seconds ( seconds * 60 * 1440 = 1 day )</li>
</ul>

Example:

<blockquote>
 9 days [* 60] = 540 [* 1440] = 777600 seconds
</blockquote>

The same is true in reverse:

<blockquote>
 777600 seconds [/ 1440] = 540 [/ 60] = 9 days
</blockquote>

blocks|key|2828377|text|真正的答案可能非常接近这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2828378|回到PHP3时代，PHP本身没有会话支持。|2828379|但一个名为PHPLIB的开源库，最初由NetUSE+AG的Boris+Erdmann和Kristian+Koehntopp编写，通过PHP3代码提供会话。|2828380|会话生存期是以分钟为单位定义的，而不是秒。默认生命周期是1440分钟，或者恰好是一天。以下是PHPLIB代码行：|offset|length|style|BOLD|2828381|var+$gc_time++=+1440;+++++++##+Purge+all+session+data+older+than+1440+minutes.|code-block|syntax|javascript|2828382|Sascha+Schumann在1998至2000年间参与了PHPLIB项目。毫无疑问，他熟悉PHP3会话代码。|2828383|然后PHP4在2000年推出，支持原生会话，但现在生命周期以秒为单位指定。|2828384|我敢打赌，有人从来没有费心把分钟转换成秒。很可能那个人就是萨沙·舒曼。一旦该值被编码到Zend引擎中，它也成为配置(php.ini)的默认值。|CODE|2828385|entityMap^0|0|0|0|7|2|0|0|0|0|1M|7|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|10|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|11|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|12|8|@$H|13|I|14|J|K]]|9|@]|A|$]]|$1|L|3|M|5|N|7|15|8|@]|9|@]|A|$O|P]]|$1|Q|3|R|5|6|7|16|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|17|8|@]|9|@]|A|$]]|$1|U|3|V|5|6|7|18|8|@$H|19|I|1A|J|W]]|9|@]|A|$]]|$1|X|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|Y|$]]

The real answer is probably very close to this:

Back during PHP3 days, PHP itself had no session support. 

But an open-source library called PHPLIB, initially written by Boris Erdmann and Kristian Koehntopp from NetUSE AG, provided sessions via PHP3 code. 

Session lifetimes were defined in minutes, not seconds. And the default lifetime was 1440 minutes, or exactly one day. Here's that line of code from PHPLIB:

<pre><code>var $gc_time = 1440; ## Purge all session data older than 1440 minutes.
</code></pre>

Sascha Schumann was involved with the PHPLIB project around the period of 1998 to 2000. There's no doubt he was familiar with the PHP3 session code.

Then PHP4 came out in the year 2000 with native session support, but now the lifetime was specified in seconds.

I'll bet someone just never bothered converting minutes to seconds. It's probable that person was Sascha Schumann. Once that value was coded into the Zend engine, it became the configuration (<code>php.ini</code>) default as well.

I've been doing some research on PHP Session Handling and came across the <code>session.gc_maxlifetime</code> value of 1440 seconds.
I've been wondering why the standard value is 1440 and how it is calculated?
What is the basis for this calculation?

How long does it make sense to keep sessions? What min/max values for session.gc_maxlifetime would you recommend?
The higher the value, the more vulnerable the Web-App is for Session Hijacking, I'd say.

Why is the standard session lifetime 24 minutes (1440 seconds)?

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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我一直在做一些关于PHP会话处理的研究，遇到了1440秒的session.gc_maxlifetime值。我一直在想为什么标准值是1440，它是如何计算的？这个计算的基础是什么？保持会话多长时间是有意义的？您建议session.gc_maxlifetime的最小/最大值是多少？这个值越高，Web-App就越容易受到会话...

问为什么标准会话生存期是24分钟(1440秒)？
EN

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问为什么标准会话生存期是24分钟(1440秒)？EN