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docs/ccxt/wiki/examples/php/cache-exchange-instance-reuse.md

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+- [Cache Exchange Instance Reuse](./examples/php/)
+
+
+ ```php
+ <?php
+
+error_reporting(E_ALL);
+date_default_timezone_set('UTC');
+
+include dirname(dirname(dirname(__FILE__))) . '/ccxt.php';
+
+function create_exchange($exchange_id, $config) {
+
+    $exchange_class = '\\ccxt\\' . $exchange_id;
+    $exchange = new $exchange_class($config);
+    $cache_location = "./cached_{$exchange_id}_data.json";
+    $start_time = microtime(true);
+
+    if (file_exists($cache_location)) {
+        $loaded_cache = json_decode(file_get_contents($cache_location), true);
+        $exchange->set_markets($loaded_cache['markets'], $loaded_cache['currencies']);
+        print("{$exchange_id} Loaded markets from cache in " . (microtime(true) - $start_time) . " seconds\n");
+    } else {
+        $markets = $exchange->load_markets();
+        file_put_contents($cache_location, json_encode(['markets'=>$markets, 'currencies'=>$exchange->currencies]));
+        print("{$exchange_id} Loaded fresh markets in " . (microtime(true) - $start_time) . " seconds\n");
+    }
+    return $exchange;
+}
+
+$exchange1 = create_exchange('bittrex', ['custom_id'=>'mybittrex1']);
+print ($exchange1->fetch_trades('BTC/USDT')[0]);
+ 
+```