PHP SMTP Mailer library implemented by socket
Simple and lightweight OOP wrapper for PHP's low-level sockets extension (ext-sockets)
Non-blocking socket and TLS functionality for PHP based on Amp.
Async, streaming plaintext TCP/IP and secure TLS socket server and client connections for ReactPHP.
A server side alternative implementation of socket.io in PHP based on workerman.
An asynchronous event driven PHP socket framework. Supports HTTP, Websocket, SSL and other custom protocols. PHP>=5.3.