convert txt to sitemap.xml with PHP

suppose that I have text database include is ;

http://ift.tt/1Ass03d

http://ift.tt/1r4nShf

http://ift.tt/1Ass2rC

I would like to convert to my text database to sitemap.xml.

$fp = fopen('./database.txt', 'r');

$xml = new XMLWriter;

$xml->openURI('./sitemap.xml');

$xml->setIndent(true);

$xml->startElement('urlset');

while ($line = fgetcsv($fp)) {

if (count($line) < 4) continue;

$xml->startElement('url');

$xml->writeElement('loc', $line[0]);

$xml->writeElement('changefreq', $line[1]);

$xml->writeElement('priority', $line[2]);

echo $xliff->getDocument();

$xml->endElement();

}

$xml->endElement();

I tried this code , I couldn't add this part...

xml version="1.0" encoding="UTF-8"

http://ift.tt/1r4nShl'xsi:schemaLocation='ht.tp://w.w.w.sitemaps.org/schemas/sitemap/0.9 h.ttp://w.w.w.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd

I am waiting your help. Regards.