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socket_create_pair> <socket_connect
[edit] Last updated: Sat, 12 May 2012

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socket_create_listen

(PHP 4 >= 4.1.0, PHP 5)

socket_create_listenOpens a socket on port to accept connections

Description

resource socket_create_listen ( int $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 backlog parameter defines the maximum length the queue of pending connections may grow to. SOMAXCONN may be passed as backlog parameter, 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_pair> <socket_connect
[edit] Last updated: Sat, 12 May 2012
 
add a note add a note User Contributed Notes socket_create_listen
danf at speet dot com 06-Aug-2010 12:50
A simple Class for Socket Server.

<?php

/**
 * Description of socketclass
 *
 * @author daniell
 */
class Socket {
   
// Sockets
   
private $sock;
    private
$lister;
   
// Wait, Porta, Ack
   
private $wait;
    private
$porta;
    private
$ack;
   
// Usuario
   
private $user;
   
    function
__construct($wait, $porta, $ack) {
       
$this->wait  = $wait;
       
$this->porta = $porta;
       
$this->ack   = $ack;
       
$this->user['ip'] = $this->user['port'] = NULL;
       
// Cria o servidor
       
$this->socketListen();
    }

    function 
__destruct() {
       
$this->close();
    }
   
   
// Cria o Servidor
   
public function socketListen(){
        while( !(
$this->lister = @socket_create_listen($this->porta) ) ){
            echo
'Aguarde..';
           
sleep($this->wait);
        }
    }

   
// Aguarda um Cliente conectar.
   
public function waitClient(){
       
$r = array($this->lister);
        if(
socket_select($r,$w = NULL,$e = NULL, $this->wait) ){
           
// Conectado
           
$this->sock = socket_accept($this->lister);
           
socket_getpeername($this->sock, $raddr, $rport);
           
$this->user = array('ip'=>$raddr,'port'=>$rport);           
            return
true;
        } else {
           
// [Time out] - Não conectado a tempo.
           
return false;
        }
       
    }
   
   
// Fecha a conexão
   
public function close(){
        if(
is_resource($this->lister) )
           
socket_close($this->lister);
    }
   
   
// Obtem as informações do usuário
   
public function getUserInfo(){
        return
$this->user;
    }
   
   
// Le todo o sock a cada 1 Byte.
   
public function write($message){
       
$num = 0;
       
$length = strlen($message);
        do{
           
$buff = substr($message, $num);
           
$num += socket_write($this->sock,$buff);
        }while(
$num != $length );
    }

   
// Envia o ACK
   
public function sendAck(){
        do{
           
$num = socket_write($this->sock,$this->ack);
        }while(
$num == 0 );
    }

   
// Recebe o ACK
   
public function waitAck(){
        do {
           
$buff = socket_read($this->sock,1,PHP_BINARY_READ);
        }while(
$buff != $this->ack );
    }

   
// Le todo o sock a cada 1 Byte.
   
public function read(){
       
$message = '';
        do {
           
$buff     = socket_read($this->sock,1,PHP_BINARY_READ);
           
$message .= $buff;
        }while(
$buff != "\n" );
        return
$message;
    }
}
?>
vicente dot lopez at caixadesoft dot es 27-Jul-2009 09:29
I use this script to listen on 3 ports, but with 'netstat -a' in other console reports only the last one is 'LISTEN'.

#!/usr/bin/php -q
<?php
    $services
= array(
                               
56700    =>    'daemon1',
                               
56701    =>    'daemon2',
                               
56703    =>    'daemon3',
                            );
   
   
// --- Marca el Tiempo Ilimitado para pararse ---
   
set_time_limit (0);
   
   
$sockets = array();
   
    foreach(
$services as $port => $daemon)
    {
       
// --- Abre el socket ---
       
if ($sock = @socket_create_listen($port))
        {
           
$sockets[$sock] = $daemon;
        }
        else
        {
            echo(
"error\n");
        }
    }
   
   
print_r($sockets);
   
    while (
1)
    {
        echo
"";
    }   
?>
aeolianmeson at ifacfchi dot blitzeclipse dot com 26-Jun-2008 10:34
I believe that on some systems this may not bind to some or all public interfaces.

On my Windows system, I could not connect on the public interface using this, but could when I made the individual calls to create, bind, and listen.

Dustin Oprea
sysspoof at ng-lab dot org 06-Mar-2008 05:03
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.
jdittmer at ppp0 dot net 16-Jul-2004 11:42
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);
?>
basim at baassiri dot com 06-Feb-2004 08:50
Remember that ports are only valid from 1 - 65536

 
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