add start to nginx mvc routing article

contents/writing/about/using-nginx-for-php-mvc-routing/index.md

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+---
+title: Using Nginx for PHP MVC Routing
+author: Brett Langdon
+date: 2014-03-17
+template: article.jade
+---
+
+An approach for using Nginx to handle all url routing
+for a PHP MVC Framework
+
+---
+
+Last week I was profiling a
+<a href="http://www.php.org" target="_blank">PHP</a> application
+and noticed the overhead of having the url routing written in
+PHP. It is not that the code was poorly written or anything,
+but just seemed like a lot of overhead for the application.
+So, I had an idea what if I moved the url routing to some other
+system that was made for handling url routing? Like,
+<a href="http://nginx.org" target="_blank">nginx</a>.
+
+_Warning:_ My prototype makes the assumption that I am right
+and that nginx is actually faster than PHP for url routing.
+I am yet to do any performance testing, so I may actually be
+wrong here, but thought I'd share my musings anyways.
+
+```php
+<?php
+$controllerName = $_SERVER['HTTP_PHP_CONTROLLER'];
+$urlParams = array();
+foreach($_SERVER as $name => $value){
+    if(substr($name, 0, 9) == 'HTTP_URL_'){
+        $urlParams[substr($name, 0, 9)] = $value;
+    }
+}
+
+$controller = new $controllerName();
+$controller->handleRoute($urlParams);
+```
+
+
+```cfg
+upstream php {
+    server 127.0.0.1:8000;
+    }
+
+server {
+    listen 80;
+    server_name localhost;
+
+    location ~* /model/(?<modelId>[0-9]+)(/.*?\.html)? {
+        proxy_set_header PHP_CONTROLLER "ModelViewController";
+        proxy_set_header URL_MODELID $modelId;
+        proxy_pass http://php;
+    }
+
+    location ~* ^(?<url>/.*)$ {
+        proxy_set_header PHP_CONTROLLER "DefaultController";
+        proxy_set_header URL_URL $url;
+        proxy_pass http://php;
+    }
+}
+```