# stream_socket_server

(PHP 5)

stream_socket_server — Create an Internet or Unix domain server socket

### Description

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`.

> Note: 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 List of Supported Socket Transports for a list of bulitin transports.

Example#1 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().

> Note: Most systems require root access to create a server socket on a port below 1024.

Example#2 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);
?>`

> Note: 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.