{

$c = curl_init();

curl_setopt($c, CURLOPT_RETURNTRANSFER, TRUE);

curl_setopt($c, CURLOPT_SSL_VERIFYPEER, FALSE);

curl_setopt($c, CURLOPT_TIMEOUT, 1);

curl_setopt($c, CURLOPT_URL, $URL);

$contents = curl_exec($c);

curl_close($c);

if ($contents) return $contents;

else return $contents = '{"status":0}';

global $rootDir, $apiDir, $cny_price;

// get data from Bitstamp

echo time()." - connecting to Bitstamp....".PHP_EOL.PHP_EOL;

$bitstamp_data = json_decode(curl_get_contents('https://www.bitstamp.net/api/ticker/'));

$ticker_bstmp['bid'] = $bitstamp_data->bid;

$ticker_bstmp['ask'] = $bitstamp_data->ask;

$ticker_bstmp['timestamp'] = $bitstamp_data->timestamp;

$commFile = $rootDir."comm/bitstamp.last";

$comm = fopen($commFile, "r");

$last_bstmp = fread($comm,filesize($commFile));

fclose($comm);

$last_bstmp = json_decode($last_bstmp);

$oldticker_bstmp['bid'] = $last_bstmp->bid;

$oldticker_bstmp['ask'] = $last_bstmp->ask;

$oldticker_bstmp['timestamp'] = $last_bstmp->timestamp;

$oldticker_bstmp['premium'] = $last_bstmp->premium;

$commFile = $apiDir;

$comm = fopen($apiDir, "r");

$last_bix = fread($comm,filesize($commFile));

fclose($comm);

$last_bix = json_decode($last_bix);

$oldticker_bix['bid'] = $last_bix->bid;

$oldticker_bix['ask'] = $last_bix->ask;

$oldticker_bix['mid'] = $last_bix->mid;

$oldticker_bix['timestamp'] = $last_bix->ts;

if($ticker_bstmp['bid']>0 && $ticker_bstmp['ask']>0){

$time_now = time();

$lastchange_bstmp = $time_now-intval($oldticker_bstmp['timestamp']);

if($oldticker_bstmp['bid'] == $ticker_bstmp['bid'] && $oldticker_bstmp['ask'] == $ticker_bstmp['ask']) {

echo time()." - Bitstamp price did not change for ".$lastchange_bstmp." seconds.".PHP_EOL;

echo time()." - Bitstamp Ticker: ".json_encode($ticker_bstmp).PHP_EOL.PHP_EOL;

if($lastchange_bstmp > 59){

$ticker_bstmp['status'] ='error';

$ticker_bstmp['spread'] = $oldticker_bstmp['ask'] - $oldticker_bstmp['bid'];

$ticker_bstmp['ask'] = $oldticker_bix['mid'] + $ticker_bstmp['spread']/2 + $oldticker_bstmp['premium'];

$ticker_bstmp['bid'] = $oldticker_bix['mid'] - $ticker_bstmp['spread']/2 + $oldticker_bstmp['premium'];

$ticker_bstmp['timestamp'] = $oldticker_bix['timestamp'];

echo time()." - Error - Setting virtual price for Bitstamp".PHP_EOL;

echo time()." - Virtual Bitstamp Ticker: ".json_encode($ticker_bstmp).PHP_EOL;

} else {

$ticker_bstmp['status'] ='ok';

}

}else{

$ticker_bstmp['status'] ='ok';

$ticker_bstmp['mid'] = ($oldticker_bstmp['bid'] + $oldticker_bstmp['ask'])/2;

$ticker_bstmp['premium'] = round($ticker_bstmp['mid'] - $oldticker_bix['mid'], 2);

echo time()." - New Bitstamp Ticker: ".json_encode($ticker_bstmp).PHP_EOL.PHP_EOL;

$comm = fopen($rootDir."comm/bitstamp.last", "w");

$comm_message = json_encode($ticker_bstmp);

fwrite($comm, $comm_message);

fclose($comm);

}

}else{

$ticker_bstmp['status'] ='error';

$ticker_bstmp['spread'] = $oldticker_bstmp['ask'] - $oldticker_bstmp['bid'];

$ticker_bstmp['ask'] = $oldticker_bix['mid'] + $ticker_bstmp['spread']/2 + $oldticker_bstmp['premium'];

$ticker_bstmp['bid'] = $oldticker_bix['mid'] - $ticker_bstmp['spread']/2 + $oldticker_bstmp['premium'];

$ticker_bstmp['timestamp'] = $oldticker_bix['timestamp'];

echo time()." Error - Setting virtual price for Bitstamp".PHP_EOL;

echo time()." Virtual Bitstamp Ticker: ".json_encode($ticker_bstmp).PHP_EOL.PHP_EOL;

}

// get data from Bitfinex

echo time()." - connecting to Bitfinex....".PHP_EOL.PHP_EOL;

$bitfinex_data = json_decode(curl_get_contents('https://api.bitfinex.com/v1/pubticker/btcusd'));

$ticker_bfx['bid'] = $bitfinex_data->bid;

$ticker_bfx['ask'] = $bitfinex_data->ask;

$ticker_bfx['timestamp'] = $bitfinex_data->timestamp;

$commFile = $rootDir."comm/bitfinex.last";

$comm = fopen($commFile, "r");

$last_bfx = fread($comm,filesize($commFile));

fclose($comm);

$last_bfx = json_decode($last_bfx);

$oldticker_bfx['bid'] = $last_bfx->bid;

$oldticker_bfx['ask'] = $last_bfx->ask;

$oldticker_bfx['timestamp'] = $last_bfx->timestamp;

$oldticker_bfx['premium'] = $last_bfx->premium;

$commFile = $apiDir;

$comm = fopen($apiDir, "r");

$last_bix = fread($comm,filesize($commFile));

fclose($comm);

$last_bix = json_decode($last_bix);

$oldticker_bix['bid'] = $last_bix->bid;

$oldticker_bix['ask'] = $last_bix->ask;

$oldticker_bix['mid'] = $last_bix->mid;

$oldticker_bix['timestamp'] = $last_bix->ts;

if($ticker_bfx['bid']>0 && $ticker_bfx['ask']>0){

$time_now = time();

$lastchange_bfx = $time_now-intval($oldticker_bfx['timestamp']);

if($oldticker_bfx['bid'] == $ticker_bfx['bid'] && $oldticker_bfx['ask'] == $ticker_bfx['ask']) {

echo time()." - Bitfinex price did not change for ".$lastchange_bfx." seconds.".PHP_EOL;

echo time()." - Bitfinex Ticker: ".json_encode($ticker_bfx).PHP_EOL.PHP_EOL;

if($lastchange_bfx > 59){

$ticker_bfx['status'] ='error';

$ticker_bfx['spread'] = $oldticker_bfx['ask'] - $oldticker_bfx['bid'];

$ticker_bfx['ask'] = $oldticker_bix['mid'] + $ticker_bfx['spread']/2 + $oldticker_bfx['premium'];

$ticker_bfx['bid'] = $oldticker_bix['mid'] - $ticker_bfx['spread']/2 + $oldticker_bfx['premium'];

$ticker_bfx['timestamp'] = $oldticker_bix['timestamp'];

echo time()." - Error - Setting virtual price for Bitfinex".PHP_EOL;

echo time()." - Virtual Bitfinex Ticker: ".json_encode($ticker_bfx).PHP_EOL;

} else {

$ticker_bfx['status'] ='ok';

}

}else{

$ticker_bfx['status'] ='ok';

$ticker_bfx['mid'] = ($oldticker_bfx['bid'] + $oldticker_bfx['ask'])/2;

$ticker_bfx['premium'] = round($ticker_bfx['mid'] - $oldticker_bix['mid'], 2);

echo time()." - New Bitfinex Ticker: ".json_encode($ticker_bfx).PHP_EOL.PHP_EOL;

$comm = fopen($rootDir."comm/bitfinex.last", "w");

$comm_message = json_encode($ticker_bfx);

fwrite($comm, $comm_message);

fclose($comm);

}

}else{

$ticker_bfx['status'] ='error';

$ticker_bfx['spread'] = $oldticker_bfx['ask'] - $oldticker_bfx['bid'];

$ticker_bfx['ask'] = $oldticker_bix['mid'] + $ticker_bfx['spread']/2 + $oldticker_bfx['premium'];

$ticker_bfx['bid'] = $oldticker_bix['mid'] - $ticker_bfx['spread']/2 + $oldticker_bfx['premium'];

$ticker_bfx['timestamp'] = $oldticker_bix['timestamp'];

echo time()." Error - Setting virtual price for Bitfinex".PHP_EOL;

echo time()." Virtual Bitfinex Ticker: ".json_encode($ticker_bfx).PHP_EOL.PHP_EOL;

}

// get data from Huobi

echo time()." - connecting to Huobi....".PHP_EOL.PHP_EOL;

$huobi_data = json_decode(curl_get_contents('https://api.huobi.com/staticmarket/ticker_btc_json.js'));

if(isset($huobi_data->ticker->buy)){

$ticker_huobi['bid'] = $huobi_data->ticker->buy;

$ticker_huobi['ask'] = $huobi_data->ticker->sell;

$ticker_huobi['bid'] = round($ticker_huobi['bid']/$cny_price, 2);

$ticker_huobi['ask'] = round($ticker_huobi['ask']/$cny_price, 2);

$ticker_huobi['timestamp'] = $huobi_data->time;

}

$commFile = $rootDir."comm/huobi.last";

$comm = fopen($commFile, "r");

$last_huobi = fread($comm,filesize($commFile));

fclose($comm);

$last_huobi = json_decode($last_huobi);

$oldticker_huobi['bid'] = $last_huobi->bid;

$oldticker_huobi['ask'] = $last_huobi->ask;

$oldticker_huobi['timestamp'] = $last_huobi->timestamp;

$oldticker_huobi['premium'] = $last_huobi->premium;

$commFile = $apiDir;

$comm = fopen($apiDir, "r");

$last_bix = fread($comm,filesize($commFile));

fclose($comm);

$last_bix = json_decode($last_bix);

$oldticker_bix['bid'] = $last_bix->bid;

$oldticker_bix['ask'] = $last_bix->ask;

$oldticker_bix['mid'] = $last_bix->mid;

$oldticker_bix['timestamp'] = $last_bix->ts;

if($ticker_huobi['bid']>0 && $ticker_huobi['ask']>0){

$time_now = time();

$lastchange_huobi = $time_now-intval($oldticker_huobi['timestamp']);

if($oldticker_huobi['bid'] == $ticker_huobi['bid'] && $oldticker_huobi['ask'] == $ticker_huobi['ask']) {

echo time()." - Huobi price did not change for ".$lastchange_huobi." seconds.".PHP_EOL;

echo time()." - New Huobi Ticker: ".json_encode($ticker_huobi).PHP_EOL.PHP_EOL;

if($lastchange_huobi > 59){

$ticker_huobi['status'] ='error';

$ticker_huobi['spread'] = $oldticker_huobi['ask'] - $oldticker_huobi['bid'];

$ticker_huobi['ask'] = $oldticker_bix['mid'] + $ticker_huobi['spread']/2 + $oldticker_huobi['premium'];

$ticker_huobi['bid'] = $oldticker_bix['mid'] - $ticker_huobi['spread']/2 + $oldticker_huobi['premium'];

$ticker_huobi['timestamp'] = $oldticker_bix['timestamp'];

echo time()." - Error - Setting virtual price for Huobi".PHP_EOL;

echo time()." - Last Huobi Ticker: ".json_encode($oldticker_huobi).PHP_EOL;

echo time()." - Virtual Huobi Ticker: ".json_encode($ticker_huobi).PHP_EOL;

} else {

$ticker_huobi['status'] ='ok';

}

}else{

$ticker_huobi['status'] ='ok';

$ticker_huobi['mid'] = ($oldticker_huobi['bid'] + $oldticker_huobi['ask'])/2;

$ticker_huobi['premium'] = round($ticker_huobi['mid'] - $oldticker_bix['mid'], 2);

echo time()." - New Huobi Ticker: ".json_encode($ticker_huobi).PHP_EOL.PHP_EOL;

$comm = fopen($rootDir."comm/huobi.last", "w");

$comm_message = json_encode($ticker_huobi);

fwrite($comm, $comm_message);

fclose($comm);

}

}else{

$ticker_huobi['status'] ='error';

$ticker_huobi['spread'] = $oldticker_huobi['ask'] - $oldticker_huobi['bid'];

$ticker_huobi['ask'] = $oldticker_bix['mid'] + $ticker_huobi['spread']/2 + $oldticker_huobi['premium'];

$ticker_huobi['bid'] = $oldticker_bix['mid'] - $ticker_huobi['spread']/2 + $oldticker_huobi['premium'];

$ticker_huobi['timestamp'] = $oldticker_bix['timestamp'];

echo time()." - Error - Setting virtual price for Huobi".PHP_EOL;

echo time()." - Last Huobi Ticker: ".json_encode($oldticker_huobi).PHP_EOL;

echo time()." - Virtual Huobi Ticker: ".json_encode($ticker_huobi).PHP_EOL.PHP_EOL;

}

// check data and calculate the average best bid and ask price

$time_now = time();

$latency_bfx = $time_now-intval($ticker_bfx['timestamp']);

$latency_bstmp = $time_now-intval($ticker_bstmp['timestamp']);

$latency_huobi = $time_now-intval($ticker_huobi['timestamp']);

echo time()." - Last Trade - Bitfinex: ".$latency_bfx." / Bitstamp: ".$latency_bstmp." / Huobi: ".$latency_huobi.PHP_EOL;

$ticker['ask'] = round(($ticker_bfx['ask']*3 + $ticker_bstmp['ask']*2 + $ticker_huobi['ask']*1)/6, 2);

$ticker['bid'] = round(($ticker_bfx['bid']*3 + $ticker_bstmp['bid']*2 + $ticker_huobi['bid']*1)/6, 2);

$ticker['mid'] = round(($ticker['ask'] + $ticker['bid'])/2, 2);

$ticker['ts'] = time();

$comm = fopen($apiDir, "w");

$comm_message = json_encode($ticker);

fwrite($comm, $comm_message);

fclose($comm);

return $ticker;