Fetch Tickers

<?php
// ##########################################
// for asynchronous (async/await) version check: https://github.com/ccxt/ccxt/blob/master/examples/php/async-await.php
// ##########################################

include dirname(dirname(dirname(__FILE__))) . '/ccxt.php';
date_default_timezone_set('UTC');

$exchange =new \ccxt\binance(array(
   // 'verbose' => true, // for debugging
   'timeout' => 30000,
));

$markets = $exchange->load_markets();

try {
   if ($exchange->has['fetchTickers']) {
       // one API call for all tickers (preferred way)
       $result = $exchange->fetch_tickers (); // note, don't call it for specifically binance more than once in every few seconds.
       echo "Called fetchTickers() for all tickers at once. Results count: " . count($result) . "\n";
   } else if ($exchange->has['fetchTicker']) {
       // Individual API calls for all tickers one by one (non-preferred way)
       echo "fetchTickers() is not supported by " . $exchange->id . ", calling individual fetchTicker() for each symbol instead.\n";
       // fetch one by one (not recommended)
       $i = 0;
       $test_symbols_amount = 4;
       foreach ($markets as $symbol => $m) {
           if ($i++ && $i > $test_symbols_amount) {
               echo "Stopping after getting " . $test_symbols_amount . " test symbols.\n";
               break;
           }
           $result = $exchange->fetch_ticker($symbol);
           echo "Fetched ticker for " . $result['symbol'] . ", 24hr high: " . $result['high'] . "\n";
       }
   } else {
       echo "fetchTicker/s() not supported by " . $exchange->id . ", skipping.\n";
   }
} catch (Exception $e) {
   echo '[Error] ' . $e->getMessage() . "\n";
}