Exporter koordinater fra SQL til KML via PHP

Jeg har en php som ser således ud:

<?php
require('base_tilslut.php');

// Opens a connection to a MySQL server.
$connection = mysql_connect ($server, $username, $password);
if (!$connection)
{
  die('Not connected : ' . mysql_error());
}

// Sets the active MySQL database.
$db_selected = mysql_select_db($database, $connection);
if (!$db_selected)
{
  die ('Can\'t use db : ' . mysql_error());
}

// Selects all the rows in the markers table.
$query = 'SELECT * FROM markers WHERE 1';
$result = mysql_query($query);
if (!$result)
{
  die('Invalid query: ' . mysql_error());
}

// Creates an array of strings to hold the lines of the KML file.
$kml = array('<?xml version="1.0" encoding="UTF-8"?>');
$kml[] = '<kml xmlns="http://earth.google.com/kml/2.1">';
$kml[] = ' <Document>';
$kml[] = ' <Style id="restaurantStyle">';
$kml[] = ' <IconStyle id="restuarantIcon">';
$kml[] = ' <Icon>';
$kml[] = ' <href>http://maps.google.com/mapfiles/kml/pal2/icon63.png</href>';
$kml[] = ' </Icon>';
$kml[] = ' </IconStyle>';
$kml[] = ' </Style>';
$kml[] = ' <Style id="barStyle">';
$kml[] = ' <IconStyle id="barIcon">';
$kml[] = ' <Icon>';
$kml[] = ' <href>http://maps.google.com/mapfiles/kml/pal2/icon27.png</href>';
$kml[] = ' </Icon>';
$kml[] = ' </IconStyle>';
$kml[] = ' </Style>';

// Iterates through the rows, printing a node for each row.
while ($row = @mysql_fetch_assoc($result))
{
  $kml[] = ' <Placemark id="placemark' . $row['id'] . '">';
  $kml[] = ' <name>' . htmlentities($row['name']) . '</name>';
  $kml[] = ' <description>' . htmlentities($row['address']) . '</description>';
  $kml[] = ' <styleUrl>#' . ($row['type']) .'Style</styleUrl>';
  $kml[] = ' <Point>';
  $kml[] = ' <coordinates>' . $row['lng'] . ','  . $row['lat'] . '</coordinates>';
  $kml[] = ' </Point>';
  $kml[] = ' </Placemark>';

}

// End XML file
$kml[] = ' </Document>';
$kml[] = '</kml>';
$kmlOutput = join("\n", $kml);
header('Content-type: application/vnd.google-earth.kml+xml');
echo $kmlOutput;
?>

Men jeg får et return som er således, hvad er årsagen?

Warning: Cannot modify header information - headers already sent by (output started at /home/www/vejen-online.dk/update.php:1) in /home/www/vejen-online.dk/update.php on line 63
Pan Africa Market 1521 1st Ave, Seatlea, WA #restaurantStyle -122.340141,47.608940

lukker selv