Net_Server provides an interface to create daemon application based on the sockets extension of PHP 4. In order to use Net_Server you need a PHP version greater or equal PHP 4.2, it is meant to be used with PHP-CLI.
Net_Server uses a driver based architecture that allows you to switch the drivers for your daemons. Currently a forking and a non-forking driver are available, others will follow.
As Net_Server provides an abstraction layer for the sockets extension, you do not need internal knowledge about the PHP functions. All you have to do is implement callback functions for events in your daemon, like handling new connections or incoming data.