stream_socket_pair

(PHP 5)

stream_socket_pair --  Creates a pair of connected, indistinguishable socket streams

说明

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).

参数

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

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

返回值

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

例子 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]);
}

?>

上例的输出类似于:

child PID: 1378
message from child