PHP Extension

Read Bitfinex WebSocket Ticker Channel

See more WebSocket Examples

Subscribes to the public Bitfinex websocket ticker channel and receives ticker updates. PHP Extension

<?php

include("chilkat.php");

$success = false;

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

$ws = new CkWebSocket();

// For brevity, this example does not check for errors when etablishing the WebSocket connection.
// See Establish WebSocket Connection for more complete sample code for making the connection.

$rest = new CkRest();

// Connect to api.bitfinex.com
$success = $rest->Connect('api.bitfinex.com',443,true,false);
$ws->UseConnection($rest);
$ws->AddClientHeaders();

$responseBody = $rest->fullRequestNoBody('GET','/ws');
$success = $ws->ValidateServerHandshake();
if ($success != true) {
    print $ws->lastErrorText() . "\n";
    print $responseBody . "\n";
    print $rest->responseHeader() . "\n";
    exit;
}

// After connecting, the bitfinex websocket server will send
// an info message that contains the actual version of the websocket stream.
// Receive that message..
$success = $ws->ReadFrame();
if ($success != true) {
    print 'Failed to receive a frame' . "\n";
    print 'ReadFrame fail reason = ' . $ws->get_ReadFrameFailReason() . "\n";
    print $ws->lastErrorText() . "\n";
    exit;
}

// We should get this:
// {"event":"info","version":1.1,"platform":{"status":1}}
print $ws->getFrameData() . "\n";

// Subscribe to the public ticker feed.
// See https://docs.bitfinex.com/docs for more information.
$json = new CkJsonObject();
$json->AppendString('event','subscribe');
$json->AppendString('channel','ticker');
$json->AppendString('pair','BTCUSD');

$finalFrame = true;
$success = $ws->SendFrame($json->emit(),$finalFrame);

// Read the response.
$success = $ws->ReadFrame();
if ($success != true) {
    print 'Failed to receive a frame' . "\n";
    print 'ReadFrame fail reason = ' . $ws->get_ReadFrameFailReason() . "\n";
    print $ws->lastErrorText() . "\n";
    exit;
}

// Examine the response
// We should get this:
// {"event":"subscribed","channel":"ticker","chanId":2751,"pair":"BTCUSD"}
print $ws->getFrameData() . "\n";

// Begin reading the ticker feed.
// We'll just read the 1st 5 updates and then exit..
$receivedFinalFrame = false;
$numUpdatesReceived = 0;
while ($numUpdatesReceived < 5) {

    $success = $ws->ReadFrame();
    if ($success != true) {
        print 'Failed to receive a frame' . "\n";
        print 'ReadFrame fail reason = ' . $ws->get_ReadFrameFailReason() . "\n";
        print $ws->lastErrorText() . "\n";
        exit;
    }

    // The responses we desire are in Text frames, where the opcode = 1.
    if ($ws->get_FrameOpcodeInt() == 1) {
        $receivedText = $ws->getFrameData();
        print $receivedText . "\n";
        // Should receive a line of text such as this:
        // [2751,7349,36.34269559,7349.1,41.01777063,-116.2,-0.0156,7349.1,22188.26055319,7560,7270.5]
        $numUpdatesReceived = $numUpdatesReceived + 1;
    }

}

// Close the websocket connection.
$success = $ws->SendClose(true,1000,'Closing this websocket.');
if ($success != true) {
    print $ws->lastErrorText() . "\n";
    exit;
}

// Read the Close response.
$success = $ws->ReadFrame();
if ($success != true) {
    print 'ReadFrame fail reason = ' . $ws->get_ReadFrameFailReason() . "\n";
    print $ws->lastErrorText() . "\n";
    exit;
}

print 'Success.' . "\n";

?>