stream_socket_pair

(PHP 5 >= 5.1.0)

stream_socket_pair — Creates a pair of connected, indistinguishable socket streams

Description

array stream_socket_pair ( int $domain , int $type , int $protocol )

stream_socket_pair() creates a pair of connected, indistinguishable socket streams. This function is commonly used in IPC (Inter-Process Communication).

Parameters

domain: The protocol family to be used: STREAM_PF_INET, STREAM_PF_INET6 or STREAM_PF_UNIX
type: The type of communication to be used: STREAM_SOCK_DGRAM, STREAM_SOCK_RAW, STREAM_SOCK_RDM, STREAM_SOCK_SEQPACKET or STREAM_SOCK_STREAM
protocol: The protocol to be used: STREAM_IPPROTO_ICMP, STREAM_IPPROTO_IP, STREAM_IPPROTO_RAW, STREAM_IPPROTO_TCP or STREAM_IPPROTO_UDP

Note: Please consult the Streams constant list for further details on each constant.

Return Values

Returns an array with the two socket resources on success, or FALSE on failure.

Examples

Example #1 A stream_socket_pair() example

This example shows the basic usage of stream_socket_pair() in Inter-Process Comunication.


<?php



$sockets = stream_socket_pair(STREAM_PF_UNIX, STREAM_SOCK_STREAM, STREAM_IPPROTO_IP);

$pid     = pcntl_fork();



if ($pid == -1) {

     die('could not fork');



} else if ($pid) {

     /* parent */

    fclose($sockets[0]);



    fwrite($sockets[1], "child PID: $pid\n");

    echo fgets($sockets[1]);



    fclose($sockets[1]);



} else {

    /* child */

    fclose($sockets[1]);



    fwrite($sockets[0], "message from child\n");

    echo fgets($sockets[0]);



    fclose($sockets[0]);

}



?>

The above example will output something similar to:

child PID: 1378
message from child

Notes

Note: This function is not implemented on Windows platforms.