refactor: transport agnostic examples (#131)

examples/discovery-calculator/server.php

@@ -0,0 +1,34 @@
+#!/usr/bin/env php
+<?php
+
+/*
+ * This file is part of the official PHP MCP SDK.
+ *
+ * A collaboration between Symfony and the PHP Foundation.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+require_once dirname(__DIR__).'/bootstrap.php';
+chdir(__DIR__);
+
+use Mcp\Server;
+use Mcp\Server\Session\FileSessionStore;
+
+logger()->info('Starting MCP Calculator Server...');
+
+$server = Server::builder()
+    ->setServerInfo('Calculator', '1.1.0', 'Basic Calculator')
+    ->setInstructions('This server supports basic arithmetic operations: add, subtract, multiply, and divide. Send JSON-RPC requests to perform calculations.')
+    ->setContainer(container())
+    ->setSession(new FileSessionStore(__DIR__.'/sessions'))
+    ->setLogger(logger())
+    ->setDiscovery(__DIR__)
+    ->build();
+
+$result = $server->run(transport());
+
+logger()->info('Server listener stopped gracefully.', ['result' => $result]);
+
+shutdown($result);