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docs/ccxt/wiki/examples/php/order-book-level-depth-extra-param.md

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+- [Order Book Level Depth Extra Param](./examples/php/)
+
+
+ ```php
+ <?php
+
+include './ccxt.php';
+
+date_default_timezone_set('UTC');
+
+// instantiate the exchange by id
+$exchange = '\\ccxt\\kraken';
+$exchange = new $exchange ();
+$limit = 10; // up to ten order on each side, for example
+var_dump ($exchange->fetch_order_book ('BTC/USD', $limit));
+
+
+?> 
+```