title: How to set up case insensitive routes with Slim framework?
body: <p>I have the following association between a route and a callback in my application:</p>
  
  <pre><code>$api-&gt;slim-&gt;post('/:accountId/Phone-Numbers/', function($accountId) use ($api) {
      $api-&gt;createPhoneNumber($accountId);
  });
  </code></pre>
  
  <p>What I want to avoid is having the route <code>myhost/a7b81cf/phone-numbers/</code> return a 404 response because Slim understands the route <code>myhost/a7b81cf/Phone-Numbers/</code> as being different, due to the usage of uppercase letters.
  How can I avoid setting up two separate routes that trigger the same callback function?</p>