(PHP 4 >= 4.1.0, PHP 5, PHP 7)
socket_create_pair — Creates a pair of indistinguishable sockets and stores them in an array
$domain
, int $type
, int $protocol
, array &$fd
) : bool
socket_create_pair() creates two connected and
indistinguishable sockets, and stores them in fd.
This function is commonly used in IPC (InterProcess Communication).
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.
fdReference to an array in which the two socket resources will be inserted.
成功时返回 TRUE， 或者在失败时返回 FALSE。
Example #1 socket_create_pair() example
<?php
$sockets = array();
/* On Windows we need to use AF_INET */
$domain = (strtoupper(substr(PHP_OS, 0, 3)) == 'WIN' ? AF_INET : AF_UNIX);
/* Setup socket pair */
if (socket_create_pair($domain, SOCK_STREAM, 0, $sockets) === false) {
echo "socket_create_pair failed. Reason: ".socket_strerror(socket_last_error());
}
/* Send and Receive Data */
if (socket_write($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 #2 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 "Received $strtwo\n";
}
socket_close($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 "Received $strone\n";
}
socket_close($ary[0]);
}
?>