PHP Extension

Receive a 16-bit Integer from a Socket

Demonstrates Socket.ReceiveInt16, which reads exactly two bytes as a 16-bit integer and stores the result in the ReceivedInt property. Byte order and signedness are selectable.

Background. Fixed-size integers and length prefixes are common building blocks for application-defined binary protocols. Byte order is selectable, with big-endian being network byte order.

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<?php

include("chilkat.php");

$success = false;

$socket = new CkSocket();

//  Connect to the server using TLS.
$bTls = true;
$maxWaitMs = 5000;
$success = $socket->Connect('example.com',5000,$bTls,$maxWaitMs);
if ($success == false) {
    print $socket->lastErrorText() . "\n";
    exit;
}

//  Read exactly two bytes as a 16-bit integer and store the result in the ReceivedInt property.
//  The 1st argument selects byte order (true = big-endian); the 2nd selects unsigned interpretation.
$bBigEndian = true;
$bUnsigned = false;
$success = $socket->ReceiveInt16($bBigEndian,$bUnsigned);
if ($success == false) {
    print $socket->lastErrorText() . "\n";
    exit;
}

print 'Received 16-bit integer: ' . $socket->get_ReceivedInt() . "\n";

?>