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Create an Internet or Unix domain server socket


stream_socket_server

(PHP 5)

stream_socket_serverCreate an Internet or Unix domain server socket

Description

resource stream_socket_server ( string $local_socket [, int &$errno [, string &$errstr [, int $flags = STREAM_SERVER_BIND | STREAM_SERVER_LISTEN [, resource $context ]]]] )

Creates a stream or datagram socket on the specified local_socket.

This function only creates a socket, to begin accepting connections use stream_socket_accept().

Parameters

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.

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.

errno

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.

errstr

See errno description.

flags

A bitmask field which may be set to any combination of socket creation flags.

Note:

For UDP sockets, you must use STREAM_SERVER_BIND as the flags parameter.

context

Return Values

Returns the created stream, or FALSE on error.

Examples

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$errstrSTREAM_SERVER_BIND);
if (!
$socket) {
    die(
"$errstr ($errno)");
}

do {
    
$pkt stream_socket_recvfrom($socket10$peer);
    echo 
"$peer\n";
    
stream_socket_sendto($socketdate("D M j H:i:s Y\r\n"), 0$peer);
} while (
$pkt !== false);

?>

Notes

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



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