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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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