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# 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`.

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 Anhang L for a list of bulitin transports.

Beispiel 1. stream_socket_server() Example
`<?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().

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

Beispiel 2. Using UDP server sockets
`<?php $socket = stream_socket_server("udp://0.0.0.0:13", $errno, $errstr, STREAM_SERVER_BIND); if (!$socket) { echo "ERROR: $errno - $errstr<br />\n"; } else { while ($conn = stream_socket_accept($socket)) { fwrite($conn, date("D M j H:i:s Y\r\n")); fclose($conn); } fclose($socket); } ?>`

> Anmerkung: 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.

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