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POHow to implement a high performance asynchronous socket server application in PHP?
 

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  1. POHow to implement a high performance asynchronous socket server application in PHP?
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    <p>With nodejs, it's very easy to create a non-blocking TCP server. Example from nodejs.org:</p> <pre><code>var net = require('net'); var server = net.createServer(function (socket) { socket.write("Echo server\r\n"); socket.pipe(socket); }); server.listen(1337, "127.0.0.1") </code></pre> <p>nodejs handles the select()-/poll()-/epoll() stuff for you, the socket routines and the main loop are implemented in C, so it's very fast and efficient.</p> <p>nodejs is great, but I'd like to implement a high performance TCP socket server in PHP, because I'm a PHP guy :)</p> <p>So, one thing I already tried is to implement the socket routines in PHP, with <code>socket_create_listen</code>, <code>socket_accept</code>, <code>socket_select</code> etc. and the main loop in PHP. This works very well, but I don't think it's very efficient, because I have to use <code>socket_select</code> which calls the C-function <code>select</code> internally, but <code>epoll</code> would be better I think (I'm using Linux), but <code>epoll</code> is not available as PHP function. (<a href="http://code.google.com/p/phpsocketdaemon/" rel="noreferrer">phpsocketdaemon</a> and <a href="http://sourceforge.net/projects/phpmio/" rel="noreferrer">phpmio</a> are 2 projects I found that implement the socket-routines for you).</p> <p>Would it be possible to do it the nodejs way? I'm thinking about a PHP module that implements the loop and socket routines in C, and calls PHP callback functions for events (<code>onread</code>, <code>onerror</code>..). Or is it not worth the effort?</p>
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    1. CO/high performance TCP socket server in PHP/ looks like an oxymoron if I ever saw one.
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    2. COAs much of a PHP fan as I am, it really wasn't designed for this kind of usage. You might be able to implement a server in it, but I'd say doing it in an efficient manner would be a real feat. Unless PHP undergoes some major architectural changes to allow this kind of use I'd recommend using something better suited to the task.
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