PHP Simple XML Parser, blank response - php

Question

PHP Simple XML Parser, blank response.
The main problem with the code below is that without the parser it will work fine but as soon as the XML parser is added, so it can connect to the other server from the client, it will not return with the results, just a blank page?
Also this is a project, so before anyone ask's, why do you not have any SQLi protection. I have not as of yet implemented it yet.
Here is the code below:
Client side XML parser code: hinphp.php
<?php
$hin = $_GET["hin"];
$connection = curl_init();
curl_setopt($connection, CURLOPT_URL, "http://192.168.0.12/hinbuy.php?hin=");
curl_setopt($connection,CURLOPT_RETURNTRANSFER,1);
curl_setopt($connection,CURLOPT_HEADER, 0);
$response = curl_exec($connection);
$xml = simplexml_load_string($response);
for($index=0; $index < count($xml->songs); $index++)
{
echo $xml->songs[$index]->ID . "<br />";
echo $xml->songs[$index]->song . "<br />";
echo $xml->songs[$index]->artist . "<br />";
echo $xml->songs[$index]->year . "<br />";
echo $xml->songs[$index]->genre . "<br />";
echo $xml->songs[$index]->quantity . "<br />";
$ID = $xml->songs[$index]->ID;
echo "<a href='http://192.168.0.12/buyclihin.php?ID=$ID'>buy</a>";
}
curl_close($connection);
?>
Server side PHP select code: hinbuy.php
<?php
header("Content-type: text/xml");
echo "<?xml version='1.0' encoding='ISO-8859-1'?>";
echo "<hit>";
$hin = $_GET["hin"];
$conn = new PDO("mysql:host=localhost;dbname=xxxxx;","xxxxx","xxxxx");
$results = $conn->query("SELECT * FROM `ghit` WHERE `artist`='$hin'");
while($row=$results->fetch())
{
echo "<songs>";
echo "<id>$row[ID]</id>";
echo "<song>$row[song]</song>";
echo "<artist>$row[artist]</artist>";
echo "<year>$row[year]</year>";
echo "<genre>$row[genre]</genre>";
echo "<quantity>$row[quantity]</quantity>";
echo "</songs>";
}
echo "</hit>"
?>

Answer 1

Is it probably because you are not passing $hin to hibbuy.php?
Try:
$hin = $_GET["hin"];
$connection = curl_init();
curl_setopt($connection, CURLOPT_URL, "http://192.168.0.12/hinbuy.php?hin=" . $hin);