PHP- XML for Google Map

Dear Experts,

I use google map to locate some of my customers.
I have below code, it works and list the data for the certain dates, but it does not work more than one month or different dates.
I checked the sql, it is fine.  Sql brings data but xml do not list it.

my date format is like this 2017-12-01

$mysqli->query("set names utf8mb4");

$sql = "SELECT * FROM mytable WHERE tarih >= '$birinci' AND tarih < date_add( '$ikinci' , interval 1 day) AND uid='$satisci' and lat is not Null";

$res = $mysqli->query($sql);

$xml = new XMLWriter();

$xml->openURI("php://output");
$xml->startDocument();
$xml->setIndent(true);

$xml->startElement('markers');

while ($row = mysqli_fetch_assoc($res)) {
  $xml->startElement("marker");

  $xml->writeAttribute('id', $row['id']);
  $xml->writeAttribute('name', $row['adi']);
  $xml->writeAttribute('address', $row['tarih']);
  $xml->writeAttribute('lat', $row['lat']);
  $xml->writeAttribute('lng', $row['lng']);
  $xml->writeAttribute('type', $row['bayikodu']);
  //$xml->writeRaw($row['lng']);

  $xml->endElement();
}

$xml->endElement();

header('Content-type: text/xml');
$xml->flush();

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BRMarketingAsked:
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David FavorLinux/LXD/WordPress/Hosting SavantCommented:
Likely you'll have to provide some of your dataset + schema for someone to take a look at this.

Also, it's unclear what Google Maps has to do with looking up data by date range, so this may have confused people about your question.
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BRMarketingAuthor Commented:
Thank you David,

I find another solution. I'm now using another Google map api. Thank you
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