Examples

Example #1 Socket example: Simple TCP/IP server

This example shows a simple talkback server. Change the address and port variables to suit your setup and execute. You may then connect to the server with a command similar to: telnet 192.168.1.53 10000 (where the address and port match your setup). Anything you type will then be output on the server side, and echoed back to you. To disconnect, enter 'quit'.

#!/usr/local/bin/php -q
<?php
error_reporting
(E_ALL);

/* Allow the script to hang around waiting for connections. */
set_time_limit(0);

/* Turn on implicit output flushing so we see what we're getting
 * as it comes in. */
ob_implicit_flush();

$address '192.168.1.53';
$port 10000;

if ((
$sock socket_create(AF_INETSOCK_STREAMSOL_TCP)) === false) {
    echo 
"socket_create() failed: reason: " socket_strerror(socket_last_error()) . "\n";
}

if (
socket_bind($sock$address$port) === false) {
    echo 
"socket_bind() failed: reason: " socket_strerror(socket_last_error($sock)) . "\n";
}

if (
socket_listen($sock5) === false) {
    echo 
"socket_listen() failed: reason: " socket_strerror(socket_last_error($sock)) . "\n";
}

do {
    if ((
$msgsock socket_accept($sock)) === false) {
        echo 
"socket_accept() failed: reason: " socket_strerror(socket_last_error($sock)) . "\n";
        break;
    }
    
/* Send instructions. */
    
$msg "\nWelcome to the PHP Test Server. \n" .
        
"To quit, type 'quit'. To shut down the server type 'shutdown'.\n";
    
socket_write($msgsock$msgstrlen($msg));

    do {
        if (
false === ($buf socket_read($msgsock2048PHP_NORMAL_READ))) {
            echo 
"socket_read() failed: reason: " socket_strerror(socket_last_error($msgsock)) . "\n";
            break 
2;
        }
        if (!
$buf trim($buf)) {
            continue;
        }
        if (
$buf == 'quit') {
            break;
        }
        if (
$buf == 'shutdown') {
            
socket_close($msgsock);
            break 
2;
        }
        
$talkback "PHP: You said '$buf'.\n";
        
socket_write($msgsock$talkbackstrlen($talkback));
        echo 
"$buf\n";
    } while (
true);
    
socket_close($msgsock);
} while (
true);

socket_close($sock);
?>

Example #2 Socket example: Simple TCP/IP client

This example shows a simple, one-shot HTTP client. It simply connects to a page, submits a HEAD request, echoes the reply, and exits.

<?php
error_reporting
(E_ALL);

echo 
"<h2>TCP/IP Connection</h2>\n";

/* Get the port for the WWW service. */
$service_port getservbyname('www''tcp');

/* Get the IP address for the target host. */
$address gethostbyname('www.example.com');

/* Create a TCP/IP socket. */
$socket socket_create(AF_INETSOCK_STREAMSOL_TCP);
if (
$socket === false) {
    echo 
"socket_create() failed: reason: " socket_strerror(socket_last_error()) . "\n";
} else {
    echo 
"OK.\n";
}

echo 
"Attempting to connect to '$address' on port '$service_port'...";
$result socket_connect($socket$address$service_port);
if (
$result === false) {
    echo 
"socket_connect() failed.\nReason: ($result) " socket_strerror(socket_last_error($socket)) . "\n";
} else {
    echo 
"OK.\n";
}

$in "HEAD / HTTP/1.1\r\n";
$in .= "Host: www.example.com\r\n";
$in .= "Connection: Close\r\n\r\n";
$out '';

echo 
"Sending HTTP HEAD request...";
socket_write($socket$instrlen($in));
echo 
"OK.\n";

echo 
"Reading response:\n\n";
while (
$out socket_read($socket2048)) {
    echo 
$out;
}

echo 
"Closing socket...";
socket_close($socket);
echo 
"OK.\n\n";
?>

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User Contributed Notes 3 notes

up
19
javier,javiern at gmail dot com
2 years ago
You can easily extend the first example to handle any number of connections instead of jsut one

#!/usr/bin/env php
<?php
error_reporting
(E_ALL);

/* Permitir al script esperar para conexiones. */
set_time_limit(0);

/* Activar el volcado de salida implícito, así veremos lo que estamo obteniendo
* mientras llega. */
ob_implicit_flush();

$address = '127.0.0.1';
$port = 10000;

if ((
$sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP)) === false) {
    echo
"socket_create() falló: razón: " . socket_strerror(socket_last_error()) . "\n";
}

if (
socket_bind($sock, $address, $port) === false) {
    echo
"socket_bind() falló: razón: " . socket_strerror(socket_last_error($sock)) . "\n";
}

if (
socket_listen($sock, 5) === false) {
    echo
"socket_listen() falló: razón: " . socket_strerror(socket_last_error($sock)) . "\n";
}

//clients array
$clients = array();

do {
   
$read = array();
   
$read[] = $sock;
   
   
$read = array_merge($read,$clients);
   
   
// Set up a blocking call to socket_select
   
if(socket_select($read,$write = NULL, $except = NULL, $tv_sec = 5) < 1)
    {
       
//    SocketServer::debug("Problem blocking socket_select?");
       
continue;
    }
   
   
// Handle new Connections
   
if (in_array($sock, $read)) {       
       
        if ((
$msgsock = socket_accept($sock)) === false) {
            echo
"socket_accept() falló: razón: " . socket_strerror(socket_last_error($sock)) . "\n";
            break;
        }
       
$clients[] = $msgsock;
       
$key = array_keys($clients, $msgsock);
       
/* Enviar instrucciones. */
       
$msg = "\nBienvenido al Servidor De Prueba de PHP. \n" .
       
"Usted es el cliente numero: {$key[0]}\n" .
       
"Para salir, escriba 'quit'. Para cerrar el servidor escriba 'shutdown'.\n";
       
socket_write($msgsock, $msg, strlen($msg));
       
    }
   
   
// Handle Input
   
foreach ($clients as $key => $client) { // for each client       
       
if (in_array($client, $read)) {
            if (
false === ($buf = socket_read($client, 2048, PHP_NORMAL_READ))) {
                echo
"socket_read() falló: razón: " . socket_strerror(socket_last_error($client)) . "\n";
                break
2;
            }
            if (!
$buf = trim($buf)) {
                continue;
            }
            if (
$buf == 'quit') {
                unset(
$clients[$key]);
               
socket_close($client);
                break;
            }
            if (
$buf == 'shutdown') {
               
socket_close($client);
                break
2;
            }
           
$talkback = "Cliente {$key}: Usted dijo '$buf'.\n";
           
socket_write($client, $talkback, strlen($talkback));
            echo
"$buf\n";
        }
       
    }       
} while (
true);

socket_close($sock);
?>
up
-6
Anonymous
7 months ago
A more object oriented example of the server

#!/usr/bin/env php
<?php

class MySocketServer
{
    protected
$socket;
    protected
$clients = [];
    protected
$changed;
   
    function
__construct($host = 'localhost', $port = 9000)
    {
       
set_time_limit(0);
       
$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
       
socket_set_option($socket, SOL_SOCKET, SO_REUSEADDR, 1);

       
//bind socket to specified host
       
socket_bind($socket, 0, $port);
       
//listen to port
       
socket_listen($socket);
       
$this->socket = $socket;
    }
   
    function
__destruct()
    {
        foreach(
$this->clients as $client) {
           
socket_close($client);
        }
       
socket_close($this->socket);
    }
   
    function
run()
    {
        while(
true) {
           
$this->waitForChange();
           
$this->checkNewClients();
           
$this->checkMessageRecieved();
           
$this->checkDisconnect();
        }
    }
   
    function
checkDisconnect()
    {
        foreach (
$this->changed as $changed_socket) {
           
$buf = @socket_read($changed_socket, 1024, PHP_NORMAL_READ);
            if (
$buf !== false) { // check disconnected client
               
continue;
            }
           
// remove client for $clients array
           
$found_socket = array_search($changed_socket, $this->clients);
           
socket_getpeername($changed_socket, $ip);
            unset(
$this->clients[$found_socket]);
           
$response = 'client ' . $ip . ' has disconnected';
           
$this->sendMessage($response);
        }
    }
   
    function
checkMessageRecieved()
    {
        foreach (
$this->changed as $key => $socket) {
           
$buffer = null;
            while(
socket_recv($socket, $buffer, 1024, 0) >= 1) {
               
$this->sendMessage(trim($buffer) . PHP_EOL);
                unset(
$this->changed[$key]);
                break;
            }
        }
    }
   
    function
waitForChange()
    {
       
//reset changed
       
$this->changed = array_merge([$this->socket], $this->clients);
       
//variable call time pass by reference req of socket_select
       
$null = null;
       
//this next part is blocking so that we dont run away with cpu
       
socket_select($this->changed, $null, $null, null);
    }
   
    function
checkNewClients()
    {
        if (!
in_array($this->socket, $this->changed)) {
            return;
//no new clients
       
}
       
$socket_new = socket_accept($this->socket); //accept new socket
       
$first_line = socket_read($socket_new, 1024);
       
$this->sendMessage('a new client has connected' . PHP_EOL);
       
$this->sendMessage('the new client says ' . trim($first_line) . PHP_EOL);
       
$this->clients[] = $socket_new;
        unset(
$this->changed[0]);
    }
   
   
    function
sendMessage($msg)
    {
        foreach(
$this->clients as $client)
        {
            @
socket_write($client,$msg,strlen($msg));
        }
        return
true;
    }
}

(new
MySocketServer())->run();
?>
up
-31
Anonymous
1 year ago
The variable $in in TCP client exampe really needs to end with '\n' or otherwise it doesn't fire the read event in the server side (at least in my Delphi program).
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