socket_create_listen
(PHP 4 >= 4.1.0, PHP 5)
socket_create_listen — Opens a socket on port to accept connections
Description
$port
[, int $backlog = 128
] )
socket_create_listen() creates a new socket resource of
type AF_INET listening on all
local interfaces on the given port waiting for new connections.
This function is meant to ease the task of creating a new socket which only listens to accept new connections.
Parameters
-
port -
The port on which to listen on all interfaces.
-
backlog -
The
backlogparameter defines the maximum length the queue of pending connections may grow to.SOMAXCONNmay be passed asbacklogparameter, see socket_listen() for more information.
Return Values
socket_create_listen() returns a new socket resource
on success or FALSE on error. The error code can be retrieved with
socket_last_error(). This code may be passed to
socket_strerror() to get a textual explanation of the
error.
Notes
Note:
If you want to create a socket which only listens on a certain interface you need to use socket_create(), socket_bind() and socket_listen().
See Also
- socket_create() - Create a socket (endpoint for communication)
- socket_create_pair() - Creates a pair of indistinguishable sockets and stores them in an array
- socket_bind() - Binds a name to a socket
- socket_listen() - Listens for a connection on a socket
- socket_last_error() - Returns the last error on the socket
- socket_strerror() - Return a string describing a socket error
- socket_accept
- socket_bind
- socket_clear_error
- socket_close
- socket_cmsg_space
- socket_connect
- socket_create_listen
- socket_create_pair
- socket_create
- socket_get_option
- socket_getopt
- socket_getpeername
- socket_getsockname
- socket_import_stream
- socket_last_error
- socket_listen
- socket_read
- socket_recv
- socket_recvfrom
- socket_recvmsg
- socket_select
- socket_send
- socket_sendmsg
- socket_sendto
- socket_set_block
- socket_set_nonblock
- socket_set_option
- socket_setopt
- socket_shutdown
- socket_strerror
- socket_write
Коментарии
Remember that ports are only valid from 1 - 65535
[editor's note: typo fixed, thanks abryant at apple dot com]
If you specify no port number, or 0, a random free port will be chosen.
To use ports for ipc between client/server on the same machine you can use (minus error checking)
server.php:
<?php
$sock = socket_create_listen(0);
socket_getsockname($sock, $addr, $port);
print "Server Listening on $addr:$port\n";
$fp = fopen($port_file, 'w');
fwrite($fp, $port);
fclose($fp);
while($c = socket_accept($sock)) {
/* do something useful */
socket_getpeername($c, $raddr, $rport);
print "Received Connection from $raddr:$rport\n";
}
socket_close($sock);
?>
client.php:
<?php
$fp = fopen($port_file, 'r');
$port = fgets($fp, 1024);
fclose($fp);
$sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
socket_connect($sock, '127.0.0.1', $port);
socket_close($sock);
?>
Please note that port 1 to and with 1024 on linux and bsd system require root privileges. So it is recommended to choose a higher port for your own application.