(PHP 5)
stream_socket_server — Create an Internet or Unix domain server socket
$local_socket
[, int &$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().
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 所支持的套接字传输器（Socket Transports）列表 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_BINDas theflagsparameter.
context
Returns the created stream, or FALSE on error.
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: 当指定数值型的 IPv6 地址(例如 fe80::1)时必须用方括号将 IP 围起来——例如， tcp://[fe80::1]:80。