Creating RSS Feed from XML file

I have a XML file that I am trying to create a RSS feed from but I am having a hard time adding the headers.

It should look like this....

<?xml version="1.0"?>
<rss xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:atom="http://www.w3.org/2005/Atom" version="2.0">
  <channel>
    <title>Mesquite Area Storm Reports</title>
    <link>http://www.mesquiteweather.net/wxmesqLSR.php</link>
    <description>Courtesy of Mesquite Weather</description>
    <language>en-us</language>
    <copyright>Mesquite Weather</copyright>
    <ttl>15</ttl>
    <image>
       <url>http://www.mesquiteweather.net/images/App_75_x_75.png</url>
       <width>75</width>
       <height>75</height>
    </image>
<entrys>
  <reports>
     <timestamp>Wed Jun 5th 10:13 pm</timestamp>
     <name>Unknown</name>
     <location>Mesquite</location>
     <report>WIND DAMAGE</report>
     <description>Enter report description</description>
  </reports>
</entrys>
</channel>
</rss>

But instead it comes out like this.

http://www.mesquiteweather.net/xml/mesquite.xml

But if you run the script it is RSS but no data.

http://www.mesquiteweather.net/xml/process.php

Here is the php script....

<?php

if (isset($_POST['lsr-submit']))
    {
        header('Location: http://www.mesquiteweather.net/wxmesqLSR.php');
    }

$str = '<?xml version="1.0" encoding="UTF-8"?><entrys></entrys>';
$xml = false;if(file_exists('mesquite.xml'))
$xml = simplexml_load_file('mesquite.xml'); if(!$xml)
$xml = simplexml_load_string('<entrys/>');

$rssfeed .= '<rss xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:atom="http://www.w3.org/2005/Atom" version="2.0">';
$rssfeed .= '<channel>';
$rssfeed .= '<title>Mesquite Area Storm Reports</title>';
$rssfeed .= '<link>http://www.mesquiteweather.net/wxmesqLSR.php</link>';
$rssfeed .= '<description>Courtesy of Mesquite Weather</description>';
$rssfeed .= '<language>en-us</language>';
$rssfeed .= '<copyright>Mesquite Weather</copyright>';
$rssfeed .= '<image>';
$rssfeed .= '<url>http://www.mesquiteweather.net/images/App_75_x_75.png</url>';
$rssfeed .= '<width>75</width>';
$rssfeed .= '<height>75</height>';

$rssEnd .= '</channel>';
$rssEnd .= '</rss>';

$name = $_POST['name'];
$location = $_POST['location'];
$report = $_POST['report'];
$description = $_POST['desc'];

$fname = htmlentities($fname, ENT_COMPAT, 'UTF-8', false);
$lname = htmlentities($lname, ENT_COMPAT, 'UTF-8', false);
$location = htmlentities($location, ENT_COMPAT, 'UTF-8', false);
$report = htmlentities($report, ENT_COMPAT, 'UTF-8', false);
$description = htmlentities($description, ENT_COMPAT, 'UTF-8', false);

echo $rssfeed;

$reports = $xml->addChild('reports');
$reports->addChild('timestamp', date("D M jS g:i a",time()));
$reports->addChild('name', $name);
$reports->addChild('location', $location);
$reports->addChild('report', $report);
$reports->addChild('description', $description);

echo $rssEnd;

$doc = new DOMDocument('1.0');
$doc->formatOutput = true;
$doc->preserveWhiteSpace = true;
$doc->loadXML($xml->asXML(), LIBXML_NOBLANKS);
$doc->save('mesquite.xml');

?>

Is there an easier way to do this?