stream_socket_pair
(PHP 5 >= 5.1.0RC1)
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
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]);
}
?>
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The above example will output
something similar to: child PID: 1378
message from child |
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