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PHP : Function Reference : Socket Functions : socket_create_pair

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]);
}
?>


Code Examples / Notes » socket_create_pair

derek

This function wraps socketpair()

thegreatall

There is a syntax error in one of the code samples provided, it should look like this:
<?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]);
?>


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socket_accept
socket_bind
socket_clear_error
socket_close
socket_connect
socket_create_listen
socket_create_pair
socket_create
socket_get_option
socket_getpeername
socket_getsockname
socket_last_error
socket_listen
socket_read
socket_recv
socket_recvfrom
socket_select
socket_send
socket_sendto
socket_set_block
socket_set_nonblock
socket_set_option
socket_shutdown
socket_strerror
socket_write
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