Automatic include piwik tracking code to HTML code via nginx

index.php

<?php
// +----------------------------------------------------------------------+
// | Copyright (c) 2012 DasLampe <[email protected]> |
// | Encoding:  UTF-8 |
// +----------------------------------------------------------------------+

if(!preg_match("/^piwik$!", $_SERVER['SERVER_NAME'])) {
    $url	= $_SERVER['SERVER_NAME'];
    if(substr_count($url, '.') >= 2)
    {
		$url	= substr($url, strrpos($url, '.', -4)+1);
    }
    $result	= simplexml_load_file("http://piwik/index.php?module=API&method=SitesManager.getSitesIdFromSiteUrl&url=http://".$url."/&format=XML&token_auth=[secret token]");
    if(!empty($result))
    {
    ?>
    <!-- Piwik -->
	    <script type="text/javascript">
    var pkBaseURL = (("https:" == document.location.protocol) ? "https://piwik.nixmuss-design.de/" : "http://piwik.nixmuss-design.de/");
    document.write(unescape("%3Cscript src='" + pkBaseURL + "piwik.js' type='text/javascript'%3E%3C/script%3E"));
    </script><script type="text/javascript">
		try {
			var piwikTracker = Piwik.getTracker(pkBaseURL + "piwik.php", <?= $result->row[0]->idsite; ?>);
			piwikTracker.trackPageView();
			piwikTracker.enableLinkTracking();
		} catch( err ) {}
		</script><noscript><p><img src="http://piwik/piwik.php?idsite=<?= $result->row[0]->idsite; ?>" style="border:0" alt="" /></p></noscript>
    <!-- End Piwik Tracking Code -->
    <?php
    }
    ?>
<?php
}
?>

piwik.include.conf

	ssi  on;
	sub_filter '</body>' '<!--# include virtual="/piwiktracking/index.php" --></body>';
	location ~ /piwiktracking/ {
		root /srv/http;
		location ~ ^(.*)\.php$ {
		if (!-f $request_filename) {
			return 404;
		}
	
		include       /etc/nginx/fastcgi.conf;
		fastcgi_pass  unix:/run/php-fpm/php-fpm.socket;
		#fastcgi_pass  127.0.0.1:10001;
		}
	}