(PHP 4 >= 4.1.0, PHP 5, PHP 7) Sets nonblocking mode for file descriptor fd

(PHP 4 >= 4.1.0, PHP 5, PHP 7) Initiates a connection on a socket

(PHP 4 >= 4.1.0, PHP 5, PHP 7) Receives data from a socket whether or not it is connection-oriented

(PHP 4 >= 4.1.0, PHP 5, PHP 7) Alias of

(PHP 4 >= 4.2.0, PHP 5, PHP 7) Clears the error on the socket or the last error code

(PHP 4 >= 4.1.0, PHP 5, PHP 7) Runs the select() system call on the given arrays of sockets with a specified

(PHP 4 >= 4.1.0, PHP 5, PHP 7) Sends a message to a socket, whether it is connected or not

(PHP 5 >= 5.5.0, PHP 7) Calculate message buffer size

(PHP 4 >= 4.1.0, PHP 5, PHP 7) Alias of

(PHP 5 >= 5.4.0, PHP 7) Import a stream resource