text declaration errror in php - php

Question

Little help required
I keep getting an error :
"XML Parsing Error: XML or text declaration not at start of entity
Location: http://localhost/test/
Line Number 2, Column 1:"
in the inspector on Firefox it comes up with ^
I know that the problem will be with the ^ but I can't seem to find any whitespaces in the below code. Also in the source code the
Just to clarify I am trying to following the instructions here: Using PHP's DOM XML functions to output XML
Any help is appreiciated.
Thanks
<?php
// require("phpsqlajax_dbinfo.php");
function parseToXML($htmlStr)
{
$xmlStr=str_replace('<','<',$htmlStr);
$xmlStr=str_replace('>','>',$xmlStr);
$xmlStr=str_replace('"','"',$xmlStr);
$xmlStr=str_replace("'",''',$xmlStr);
$xmlStr=str_replace("&",'&',$xmlStr);
return $xmlStr;
}
// Opens a connection to a MySQL server
$connection=mysqli_connect ('localhost', $username, $password);
if (!$connection) {
die('Not connected : ' . mysqli_error());
}
// Set the active MySQL database
$db_selected = mysqli_select_db($connection, $database);
if (!$db_selected) {
die ('Can\'t use db : ' . mysqli_error($connection));
}
// Select all the rows in the markers table
$query = "SELECT * FROM addresses WHERE 1";
$result = mysqli_query($connection, $query);
if (!$result) {
die('Invalid query: ' . mysqli_error($connection));
}
header("Content-type: text/xml");
// Start XML file, echo parent node
echo '<?xml version="1.0"?>';
echo '<markers>';
$ind=0;
// Iterate through the rows, printing XML nodes for each
while ($row = #mysqli_fetch_assoc($result)){
// Add to XML document node
echo '<marker ';
echo 'id="' . $row['id'] . '" ';
echo 'name="' . parseToXML($row['name']) . '" ';
echo 'address="' . parseToXML($row['address']) . '" ';
echo 'lat="' . $row['lat'] . '" ';
echo 'lng="' . $row['lng'] . '" ';
echo '/>';
$ind = $ind + 1;
}
// End XML file
echo '</markers>';
?>