Wordpress: Google Analytics with "One wp-config.php file to rule them all"

gistfile1.php

<?php if (WP_ENV != 'local' && WP_ENV != 'staging') { ?>
<script type="text/javascript">
  var _gaq = _gaq || [];
  _gaq.push(['_setAccount', 'UA-xxxxxxxx-x']);
  _gaq.push(['_trackPageview']);

  (function() {
    var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
    ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
    var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
  })();
</script>
<?php } else { ?>
<!-- Non-production environment, no google analytics. -->
<?php } ?>