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docs/ccxt/wiki/examples/php/built-in-rate-limiting-poller.md

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+- [Built In Rate Limiting Poller](./examples/php/)
+
+
+ ```php
+ <?php
+
+include './ccxt.php';
+
+date_default_timezone_set('UTC');
+
+$exchange = '\\ccxt\\poloniex';
+$exchange = new $exchange();
+
+$symbol = 'DOGE/BTC';
+
+while (true) {
+    $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";
+}
+ 
+```