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stream_socket_server
Create an Internet or Unix domain server socket
(PHP 5)
resource stream_socket_server ( string local_socket [, int &errno [, string &errstr [, int flags [, resource context]]]] )
Creates a stream or datagram socket on the specified
local_socket. The type of socket created
is determined by the transport specified using standard URL formatting:
transport://target. For Internet Domain sockets
(AF_INET) such as TCP and UDP, the target portion
of the remote_socket parameter should consist of
a hostname or IP address followed by a colon and a port number. For Unix
domain sockets, the target portion should point
to the socket file on the filesystem.
flags is a bitmask field which may be set to any
combination of socket creation flags. The default value of flags is
STREAM_SERVER_BIND | STREAM_SERVER_LISTEN.
For UDP sockets, you must use STREAM_SERVER_BIND as
the flags parameter.
This function only creates a socket, to begin accepting connections use stream_socket_accept().
If the call fails, it will return FALSE and if the optional
errno and errstr
arguments are present they will be set to indicate the actual
system level error that occurred in the system-level
socket(), bind(), and
listen() calls. If the value returned in
errno is 0 and the
function returned FALSE, it is an indication that the error
occurred before the bind() call. This is
most likely due to a problem initializing the socket. Note that
the errno and
errstr arguments will always be passed by
reference.
Depending on the environment, Unix domain sockets may not be available. A list of available transports can be retrieved using stream_get_transports(). See Appendix Q, List of Supported Socket Transports for a list of bulitin transports.
Example 2391. Using TCP server sockets
<?php
$socket = stream_socket_server("tcp://0.0.0.0:8000", $errno, $errstr);
if (!$socket) {
echo "$errstr ($errno)<br />\n";
} else {
while ($conn = stream_socket_accept($socket)) {
fwrite($conn, 'The local time is ' . date('n/j/Y g:i a') . "\n");
fclose($conn);
}
fclose($socket);
}
?>
The example below shows how to act as a time server which can respond to time queries as shown in an example on stream_socket_client().
Most systems require root access to create a server socket on a port below 1024.
Example 2392. Using UDP server sockets
<?php
$socket = stream_socket_server("udp://127.0.0.1:1113", $errno, $errstr, STREAM_SERVER_BIND);
if (!$socket) {
die("$errstr ($errno)");
}
do {
$pkt = stream_socket_recvfrom($socket, 1, 0, $peer);
echo "$peer\n";
stream_socket_sendto($socket, date("D M j H:i:s Y\r\n"), 0, $peer);
} while ($pkt !== false);
?>
When specifying a numerical IPv6 address
(e.g. fe80::1) you must enclose the IP in square brackets. For example,
tcp://[fe80::1]:80.
See also stream_socket_client(), stream_set_blocking(), stream_set_timeout(), fgets(), fgetss(), fwrite(), fclose(), feof(), and the Curl extension.