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socket_create_pair

Creates a pair of indistinguishable sockets and stores them in an array (PHP 4 >= 4.0.7, PHP 5)
bool socket_create_pair ( int domain, int type, int protocol, array &fd )

socket_create_pair() creates two connected and indistinguishable sockets, and stores them in fd. This function is commonly used in IPC (InterProcess Communication).

Parameters

domain

The domain parameter specifies the protocol family to be used by the socket. See socket_create() for the full list.

type

The type parameter selects the type of communication to be used by the socket. See socket_create() for the full list.

protocol

The protocol parameter sets the specific protocol within the specified domain to be used when communicating on the returned socket. The proper value can be retrieved by name by using getprotobyname(). If the desired protocol is TCP, or UDP the corresponding constants SOL_TCP, and SOL_UDP can also be used.

See socket_create() for the full list of supported protocols.

fd

Reference to an array in which the two socket resources will be inserted.

Return Values

Returns TRUE on success or FALSE on failure.

Examples

Example 2292. socket_create_pair() example

<?php
$sockets
= array();
/* Setup socket pair */
if (socket_create_pair(AF_UNIX, SOCK_STREAM, 0, $sockets) === false) {
   echo
"socket_create_pair failed. Reason: ".socket_strerror(socket_last_error());
}
/* Send and Recieve Data */
if (socket_write($sockets[0], "ABCdef123\n", strlen("ABCdef123\n")) === false) {
   echo
"socket_write() failed. Reason: ".socket_strerror(socket_last_error($sockets[0]));
}
if ((
$data = socket_read($sockets[1], strlen("ABCdef123\n"), PHP_BINARY_READ) === false) {
   echo
"socket_read() failed. Reason: ".socket_strerror(socket_last_error($sockets[1]));
}
var_dump($data);

/* Close sockets */
socket_close($sockets[0]);
socket_close($sockets[1]);
?>


Example 2293. socket_create_pair() IPC example

<?php
$ary
= array();
$strone = 'Message From Parent.';
$strtwo = 'Message From Child.';
if (
socket_create_pair(AF_UNIX, SOCK_STREAM, 0, $ary) === false) {
   echo
"socket_create_pair() failed. Reason: ".socket_strerror(socket_last_error());
}
$pid = pcntl_fork();
if (
$pid == -1) {
   echo
'Could not fork Process.';
} elseif (
$pid) {
   
/*parent*/
   
socket_close($ary[0]);
   if (
socket_write($ary[1], $strone, strlen($strone)) === false) {
       echo
"socket_write() failed. Reason: ".socket_strerror(socket_last_error($ary[1]));
   }
   if (
socket_read($ary[1], strlen($strtwo), PHP_BINARY_READ) == $strtwo) {
       echo
"Recieved $strtwo\n";
   }
   
socket_close($ary[1]);
} else {
   
/*child*/
   
socket_close($ary[1]);
   if (
socket_write($ary[0], $strtwo, strlen($strtwo)) === false) {
       echo
"socket_write() failed. Reason: ".socket_strerror(socket_last_error($ary[0]));
   }
   if (
socket_read($ary[0], strlen($strone), PHP_BINARY_READ) == $strone) {
       echo
"Recieved $strone\n";
   }
   
socket_close($ary[0]);
}
?>