## PHP Sitemap XML Generator
## Version 1.00

## © 2008 Jacob Gifford Head
## http://www.jacob-head.com/

## This work is licenced under the "Creative Commons 
## Attribution-Non-Commercial-Share Alike 2.0 
## UK: England & Wales Licence"
## For full details see:
## http://creativecommons.org/licenses/by-nc-sa/2.0/uk/

## Comments, suggestions, problems and additions are always welcome.
## phpsitemap ~~ at ~~ jacob-head ~~ dot ~~ com

## Basic Usage:
## 1. Create a file called sitemap.xml [*] in the root directory of your website.
## 2. Ensure that the file is writable by your webserver.
## 3. Edit it so that it reads:
## <?xml version="1.0" encoding="UTF-8"?>
## <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
## </urlset>
## 4. Save this file as sitemap.inc in the root directory of your website.
## 5. Ensure that it is run when every page is loaded (e.g. by putting <?php include('sitemap.inc'); ?> at the start of each page.
## [*] The name of this file can be changed below.

## User-editable variables:
$xmlfile = "/sitemap.xml"; ## Path to your sitemap file.
$rooturl = "http://www.mysite.com"; ## Root URL of your site (omit final /)
$includeget = FALSE; ## Include pages which have a GET request in their URL (default FALSE)
## End User-editable variables.

## Begin script itself

## Load the Sitemap XML
$xml = simplexml_load_file($xmlfile);

## To avoid rewriting the XML every time a page is loaded,
## we check to see if writing is necessary (i.e. is this a
## new page or is this an old page which has a new title?)

$writefile=TRUE;

## Do not change if lastmod date has not changed.
foreach ($xml->url as $item){
	if ((string) $item->loc == $rooturl.$_SERVER['REQUEST_URI']) {
		if ((string) $item->lastmod ==  date('c', getlastmod($_SERVER['REQUEST_URI']))) {
			$writefile=FALSE;
		}
	}

}

## Do not save if inclues a GET call
if($includeget===FALSE){
	$urlincludesget = strpos($_SERVER['REQUEST_URI'], "?");
		if ($urlincludesget !== false) { 
			$writefile=FALSE;
		}
}

## If we need to write the file, then…

if ($writefile === TRUE){
	##Markup the new entry in XML
	$newentry = '
	<url>
	<loc>http://www.flageolets.com'.$_SERVER['REQUEST_URI'].'</loc>
	<lastmod>'.date('c', getlastmod($_SERVER['REQUEST_URI'])).'</lastmod>
	</url>';

	## Markup old entries in XML, excluding the one
	## which we are updating (if relevant).
	$oldentries=NULL;
	foreach ($xml->url as $item){
		if ((string) $item->loc != $rooturl.$_SERVER['REQUEST_URI']){
		if ((string) $item->lastmod != date('c', getlastmod($_SERVER['REQUEST_URI']))) { 
			$oldentries=$oldentries.'
	<url>
	<loc>'.$item->loc.'</loc>
	<lastmod>'.$item->lastmod.'</lastmod>
	</url>';
		}
		}
	} 


	## Open the file for writing
	$fileName = fopen ($xmlfile, 'w');

	## Into the file, insert the XML Boilerplate followed by the new and then the old entries	
	fputs ($fileName, '<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
'.$newentry.chr(13).chr(10).$oldentries.
'</urlset>');
	fclose ($fileName);
}