blocks|key|9131|text|PHP和Comet并不是相互排斥的。Comet只是一种服务器推送技术，所以您不必再进行第二次轮询。在PHP和JS中实现Comet，它不是一种单独的编程语言。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|9132|虽然：我不建议自己编写聊天程序，除非您需要非常具体的特性。--这是耗时的和错误的多发点。使用了一种预先制定的解决方案，例如：|offset|length|style|BOLD|9133|http://www.phpfreechat.net/|9134|或者java+IRC聊天室。谷歌想要更多。|9135|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|2|L|8|X|3|11|7|0|0|R|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@$D|U|E|V|F|G]|$D|W|E|X|F|G]|$D|Y|E|Z|F|G]|$D|10|E|11|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|12|8|@]|9|@$D|13|E|14|1|15]]|A|$]]|$1|J|3|K|5|6|7|16|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|I]]]]

PHP and Comet are not mutually exclusive. Comet is just a technique of server push, so you don't have to poll ever second. You implement Comet in PHP &amp; JS, it is not a separate programming language.

Although: I DO NOT recommend programming chat on your own, unless you need very specific features. It is time consuming and error prone. Use one of the pre-made solution, for example:

<a href="http://www.phpfreechat.net/" rel="nofollow">http://www.phpfreechat.net/</a>

or java IRC chatroom. Google for more.

blocks|key|9561|text|正如韩国Kralj所说，彗星是一种范例，可以应用于不同的技术。如果您想研究这个问题，PHP+&+Comet问题是一个很好的起点。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|9562|人们通常认为PHP不像实时技术那样扩展得太好。脸书，谁是一个PHP的房子(虽然最后，为了提高效率，将他们的PHP编译成C(或者C%2B%2B))。最常见的解决方案是使用专用实时技术进行实时通信，并将其保持在web服务器之外。|9563|在技术选择方面，我会考虑WebSockets，因为它们已经成为，实时双向通信的标准。一些“Comet”服务器也使用WebSockets作为传输，转而使用效率较低的HTTP流或HTTP对旧浏览器的长轮询。|style|BOLD|9564|如果您考虑使用托管服务，而不想只与聊天功能绑定，希望在某个时候将实时通知、视觉协作或游戏添加到您的应用程序中，那么我工作的http://pusher.com提供了一个托管实时消息服务，您可以轻松地实现您的聊天功能。|9565|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/users/924109/rok-kralj|1|https://stackoverflow.com/questions/603201/using-comet-with-php|2|http://developers.facebook.com/blog/post/358/|3|http://www.leggetter.co.uk/real-time-technologies-guide|4|http://pusher.com/websockets|5|http://pusher.com/^0|2|7|0|16|B|1|0|13|S|2|2A|4|3|0|V|A|C|A|4|0|1P|H|5|0^^$0|@$1|2|3|4|5|6|7|13|8|@]|9|@$A|14|B|15|1|16]|$A|17|B|18|1|19]]|C|$]]|$1|D|3|E|5|6|7|1A|8|@]|9|@$A|1B|B|1C|1|1D]|$A|1E|B|1F|1|1G]]|C|$]]|$1|F|3|G|5|6|7|1H|8|@$A|1I|B|1J|H|I]]|9|@$A|1K|B|1L|1|1M]]|C|$]]|$1|J|3|K|5|6|7|1N|8|@]|9|@$A|1O|B|1P|1|1Q]]|C|$]]|$1|L|3|-4|5|6|7|1R|8|@]|9|@]|C|$]]]|M|$N|$5|O|P|Q|C|$R|S]]|T|$5|O|P|Q|C|$R|U]]|V|$5|O|P|Q|C|$R|W]]|X|$5|O|P|Q|C|$R|Y]]|Z|$5|O|P|Q|C|$R|10]]|11|$5|O|P|Q|C|$R|12]]]]

As <a href="https://stackoverflow.com/users/924109/rok-kralj">Rok Kralj</a> says Comet is a paradigm and can be applied to different technologies. The <a href="https://stackoverflow.com/questions/603201/using-comet-with-php">PHP &amp; Comet</a> question is a good place to start if you want to look into this.

It tends to be commonly agreed that PHP doesn't scale too well as a realtime technology. Facebook, who are a PHP house (although <a href="http://developers.facebook.com/blog/post/358/" rel="nofollow noreferrer">ended up compiling their PHP down to C (or maybe C++) for efficiency</a>). The most common solution is to use dedicated <a href="http://www.leggetter.co.uk/real-time-technologies-guide" rel="nofollow noreferrer">realtime technology</a> for your realtime communication and keep this outside of your web server.

In terms of technology choice I would consider <a href="http://pusher.com/websockets" rel="nofollow noreferrer">WebSockets</a> since they have become the standard for realtime bi-directional communication. Some 'Comet' servers use WebSockets as a transport too and fallback to the less efficient HTTP Streaming or HTTP Long-Polling for older browsers.

If you'd consider using a hosted service, and don't want to be tied to just chat functionality, would like realtime notifications, visual collaboration or gaming to be added to your app at some point, then http://pusher.com, who I work for, offer a hosted realtime messaging service which you can easily implement your chat functionality.

I want to implement a chat system for my site. The functionality will be very similar to facebook chat. The chats will be one to one based.

I know how to build the chat system using PHP, MySql and using JQuery. But my concern is that it won’t scale to large number of users in the long term.

Using JQuery I would be making requests every second to keep the chat window updated or if the user is sending a request to chat with another user. This will cause extra load on the server as the user base will increase overtime.

I’ve been told using PHP for this is not a ideal solution, that I should look into comet programming, which I never tried before.

My question is that are there any pre-build frameworks out there that I could use, or a better approach of building it?

I heard of NodeJs and APE but these are not supported by my server.

Thanks guys. 

EDIT: after having word with my server guys, i might change my OS so i can run NodeJS.
How good is nodejs is term of scalability and will it meet my needs?

PHP Jquery: chat system, what is the Ideal framework for this?

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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