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);


    set_time_limit(0);


    ob_implicit_flush();

    $address = '192.168.1.53';
    $port = 10000;

    if ((    $sock = socket_create(AF_INET, SOCK_STREAM, SOL_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($sock, 5) === false) {
    echo     "socket_listen() failed: reason: " . socket_strerror(socket_last_error($sock)) . "\n";
    }

    do {
    if ((    $msgsock = socket_accept($sock)) === false) {
    echo     "socket_accept() failed: reason: " . socket_strerror(socket_last_error($sock)) . "\n";
    break;
    }

    $msg = "\nWelcome to the PHP Test Server. \n" .
    "To quit, type 'quit'. To shut down the server type 'shutdown'.\n";
    socket_write($msgsock, $msg, strlen($msg));

    do {
    if (    false === ($buf = socket_read($msgsock, 2048, PHP_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, $talkback, strlen($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";


    $service_port = getservbyname('www', 'tcp');


    $address = gethostbyname('www.example.com');


    $socket = socket_create(AF_INET, SOCK_STREAM, SOL_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, $in, strlen($in));
    echo     "OK.\n";

    echo     "Reading response:\n\n";
    while (    $out = socket_read($socket, 2048)) {
    echo     $out;
    }

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