从URL获取默认参数到使用php

Question

我有以下网址，需要在我的XML上复制相同的参数。

URL：

http://192.192.192.192/api/captureserver?MessageType=CaptureLookup&MachineName=00321A&RegistrationMark=MRU&DateRange=20171219-20171219. 

我需要在XML上获取MachineName。

这是我的剧本：

<?php
header ("content-type: text/xml");
$connection = mysqli_connect('127.0.0.1', 'root', 'admin', 'Customer_1') or die("cannot connect");

$xml='<?xml version="1.0" encoding="UTF-8"?>';

$RegistrationMark = $_GET['RegistrationMark'];


$qr= mysqli_query($connection, "SELECT * FROM `EarlsdonMSIN_anpr_vega` where `RegistrationMark` like '%" .$RegistrationMark. "%'");


$xml.='<MatchRecords>';
while($res=mysqli_fetch_array($qr))
{
 $xml.='<MatchLine><id>'.$res['id'].'</id><RegistrationMark>'.$res['RegistrationMark'].'</RegistrationMark><datetime>'.$res['datetime'].'</datetime><time>'.$res['time'].'</time><image_name>'.$res['image_name'].'</image_name></MatchLine>';
}
$xml.='</MatchRecords>';
echo $xml;
?>

尝试了这个：

$xml.='<MatchLine><id>'.$res['id'].'</id><MachineName>'.$res['MachineName'].'</MachineName><RegistrationMark>'.$res['RegistrationMark'].'</RegistrationMark><datetime>'.$res['datetime'].'</datetime><time>'.$res['time'].'</time><image_name>'.$res['image_name'].'</image_name></MatchLine>';
}