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docs/ccxt/wiki/examples/php/shared-markets.md

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+- [Shared Markets](./examples/php/)
+
+
+ ```php
+ <?php
+
+include './ccxt.php';
+
+date_default_timezone_set('UTC');
+
+// ----------------------------------------------------------------------------
+// an example of how to load markets for each exchange just once
+// in order to save memory and time for initializing multiple exchange instances
+// see these issues for details:
+// - https://github.com/ccxt/ccxt/issues/7312
+// - https://github.com/ccxt/ccxt/issues/8176
+// ----------------------------------------------------------------------------
+
+$keys = array(
+    'ids',
+    'markets',
+    'markets_by_id',
+    'currencies',
+    'currencies_by_id',
+    'base_currencies',
+    'quote_currencies',
+    'symbols',
+);
+
+
+$id = 'kraken';
+$exchange_class = "\\ccxt\\{$id}";
+$exchange = new $exchange_class();
+
+$markets_on_disk = "./{$id}.markets.json";
+
+$exchange->verbose = true; // this is a debug output to demonstrate which networking calls are being issued
+
+if (file_exists($markets_on_disk)) {
+
+    $cache = json_decode(file_get_contents($markets_on_disk), true);
+    foreach ($keys as $key) {
+        $exchange->{$key} = $cache[$key];
+    }
+
+} else {
+
+    $exchange->load_markets();
+    $cache = array();
+    foreach ($keys as $key) {
+        $cache[$key] = $exchange->{$key};
+    }
+    file_put_contents($markets_on_disk, json_encode($cache));
+}
+
+$exchange->fetch_ticker('ETH/BTC');
+ 
+```