Add a basic PHP server-generator example

samples/server-generator/php/templates/.htaccess

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+<IfModule mod_rewrite.c>
+    RewriteEngine On
+    RewriteCond %{REQUEST_FILENAME} !-f
+    RewriteRule ^(.*)$ index.php?_url=/$1 [QSA,L]
+</IfModule>

samples/server-generator/php/templates/README.mustache

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+# Swagger generated server
+
+## Overview
+This server was generated by the [swagger-codegen](https://github.com/swagger-api/swagger-codegen) project.  By using the
+[swagger-spec](https://github.com/swagger-api/swagger-core/wiki) from a remote server, you can easily generate a server stub.  This
+is an example of building a PHP server.
+
+This example uses the [Silex](http://silex.sensiolabs.org/) micro-framework.  To see how to make this your own, look here:
+
+[README](https://github.com/swagger-api/swagger-codegen/tree/master/samples/server-generator/php)

samples/server-generator/php/templates/composer.json

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+{
+    "require": {
+        "silex/silex": "~1.2"
+    }
+}

samples/server-generator/php/templates/index.mustache

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+<?php
+require_once __DIR__ . '/vendor/autoload.php';
+
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+use Silex\Application;
+
+$app = new Silex\Application();
+
+{{#apiInfo}}
+{{#apis}}
+{{#operations}}
+{{#operation}}
+
+$app->{{httpMethod}}('{{path}}', function(Application $app, Request $request{{#pathParams}}, ${{paramName}}{{/pathParams}}) {
+    {{#queryParams}}${{paramName}} = $request->get('{{paramName}}');{{newline}}    {{/queryParams}}
+    {{#formParams}}${{paramName}} = $request->get('{{paramName}}');{{newline}}    {{/formParams}}
+    return new Response('How about implementing {{nickname}} as a {{httpMethod}} method ?');
+});
+
+{{/operation}}
+{{/operations}}
+{{/apis}}
+{{/apiInfo}}
+
+$app->run();