AJAX - Google Crawling and 'Fetch as Google'

Question

I have a question regarding Google crawling and AJAX.

This is how my url looks like:

example.com/#!contact

I know that Google and other search engines use ?_escaped_fragment_= to replace the hash tag in order to get a certain page.

When I try:

example.com/?_escaped_fragment_=contact 

it takes me to the index page and not contact.

I used this small piece of PHP where I usually load the ajax data, and now 'Fetch as Google' gets the content.

<div id="content">
    <?php

        if(isset($_GET['_escaped_fragment_'])){

            $newID = $_GET['_escaped_fragment_'];

            include_once $newID.'.php';
        }

    ?>
</div>

Is this ok to use? IF crawling (using _escaped_fragment_) include this page with php, otherwise its a client and get him the page via ajax?

Thanks