Using comet with PHP?

Question

I was thinking of implementing real time chat using a PHP backend, but I ran across this comment on a site discussing comet:

My understanding is that

Answer 1

You will have to create your own server in PHP. Using Apache/mod_php or even fastcgi will not scale at all. A few years old, but can get you started:

PHP-Comet-Server: http://sourceforge.net/projects/comet/