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<?php
session_start();
$host = "localhost";
$userName = "root";
$password = "password";
$db = "userdata";

$connect = mysqli_connect($host,$userName,$password, $db);
$sql = "SELECT title, body FROM news";
$result = mysqli_query($connect,"$sql");

$xml = new DomDocument("1.0", "UTF-8");
$xml->load('xml.xml');

$resRows = mysqli_num_rows($result);

while($obj = $result->fetch_object())
{
$rootTag = $xml->getElementsByTagName("root")->item(0);
$infoTag = $xml->createElement("News");
if($xmlRows=count($infoTag)<$resRows)
{
    $titleTag = $xml->createElement("Title", $obj->title);
    $bodyTag = $xml->createElement("Body", $obj->body);
            $infoTag->appendChild($titleTag);
            $infoTag->appendChild($bodyTag);
        $rootTag->appendChild($infoTag);
        $xml->save("xml.xml");
    }
}
$connect->close();
?>

<?xml version="1.0"?>
<root>
    <News>
        <Title/>
        <Body/>
    </News>
    <News>
        <Title>test1</Title>
        <Body>test2</Body>
    </News>
    <News>
        <Title>testing1</Title>
        <Body>testing2</Body>
    </News>
    <News>
        <Title>title3</Title>
        <Body>body3</Body>
    </News>
    <News>
        <Title>title4</Title>
        <Body>body4</Body>
    </News>
    <News>
        <Title/>
        <Body/>
    </News>
    <News>
        <Title>test1</Title>
        <Body>test2</Body>
    </News>
    <News>
        <Title>testing1</Title>
        <Body>testing2</Body>
    </News>
    <News>
        <Title>title3</Title>
        <Body>body3</Body>
    </News>
    <News>
        <Title>title4</Title>
        <Body>body4</Body>
    </News>
</root>