Rename example folders (#87)

examples/stdio-env-variables/server.php

@@ -0,0 +1,64 @@
+#!/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\Transport\StdioTransport;
+
+/*
+    |--------------------------------------------------------------------------
+    | MCP Stdio Environment Variable Example Server
+    |--------------------------------------------------------------------------
+    |
+    | This server demonstrates how to use environment variables to modify tool
+    | behavior. The MCP client can set the APP_MODE environment variable to
+    | control the server's behavior.
+    |
+    | Configure your MCP Client (eg. Cursor) for this server like this:
+    |
+    | {
+    |     "mcpServers": {
+    |         "my-php-env-server": {
+    |             "command": "php",
+    |             "args": ["/full/path/to/examples/05-stdio-env-variables/server.php"],
+    |             "env": {
+    |                 "APP_MODE": "debug" // or "production", or leave it out
+    |             }
+    |         }
+    |     }
+    | }
+    |
+    | The server will read the APP_MODE environment variable and use it to
+    | modify the behavior of the tools.
+    |
+    | If the APP_MODE environment variable is not set, the server will use the
+    | default behavior.
+    |
+*/
+
+logger()->info('Starting MCP Stdio Environment Variable Example Server...');
+
+$server = Server::builder()
+    ->setServerInfo('Env Var Server', '1.0.0')
+    ->setLogger(logger())
+    ->setDiscovery(__DIR__, ['.'])
+    ->build();
+
+$transport = new StdioTransport(logger: logger());
+
+$server->connect($transport);
+
+$transport->listen();
+
+logger()->info('Server listener stopped gracefully.');