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docs/ccxt/wiki/examples/php/react-eventloop-with-rate-limiting.md

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+- [React Eventloop With Rate Limiting](./examples/php/)
+
+
+ ```php
+ <?php
+
+require dirname(__FILE__).'/../vendor/autoload.php';
+include dirname(__FILE__) ."/../vendor/ccxt/ccxt/ccxt.php";
+
+date_default_timezone_set('UTC');
+
+use TomWright\Database\ExtendedPDO\ExtendedPDO as ExtendedPDO;
+use TomWright\Database\QueryBuilder\SqlQueryBuilder as SqlQueryBuilder;
+
+$loop = React\EventLoop\Factory::create ();
+
+// instantiate the exchange by id
+$exchange = '\\ccxt\\poloniex';
+$exchange = new $exchange ();
+
+$tick_function = function () use ($exchange, $loop, &$tick_function) {
+    global $exchange, $loop;
+    $order_book = $exchange->fetch_order_book ($symbol);
+    echo "----------------------------------------------------------------\n";
+    echo date ('c') . "\n";
+    echo count ($order_book['bids']) . " bids and " . count ($order_book['asks']) . " asks\n";
+    echo sprintf ("bid: %.8f ask: %.8f", $order_book['bids'][0][0], $order_book['asks'][0][0]) . "\n";
+
+    $loop->futureTick ($tick_function);
+};
+
+$loop->futureTick ($tick_function);
+$loop->run (); 
+```