Using xml attribute id in page url and on page - php

Question

Im pulling in data about sports events via an xml feed, im using simplexml to do so. So far ive got a foreach loop that loops through all of the events and echos them out as a list of event names wrapped in <a> tags, pointing to a page event.php?=id (id is determined via the events attribute called id).
to do this im using
<?php
$xml = simplexml_load_file("openbet_cdn.xml");
foreach($xml->response->williamhill->class->type->market as $market) {
$market_attributes = $market->attributes();
printf("%s\n",
$market_attributes->id,
$market_attributes->name);
}
?>
the feed I'm using is http://whdn.williamhill.com/pricefeed/openbet_cdn?action=template&template=getHierarchyByMarketType&classId=5&marketSort=HH&filterBIR=N
What im having trouble with is on my page event.php i keep getting the first event in the xml feed displayed. To do this im using :
<?php
foreach ($xml->response->williamhill->class->type->market->participant as $participant) {
$participant_attributes = $participant->attributes();
echo "<tr>";
// EVENT NAME
echo "<td>";
echo "<a href=".$market_attributes['url'].">";
echo $participant_attributes['name'];//participants name
echo "</a>";
echo"</td>";
//ODDS
echo "<td>";
echo $participant_attributes['odds'];
echo "</td>";
echo "</tr>";
}
?>
I can see why it is because im not referencing the id which is in the URL of the event page. But I'm not quite sure of how to do this, any idea how I can tackle this ?

Answer 1

You just need to add an if within the loop so that you only target the event ID that matches the one in the querystring. A nested loop is also needed because you want to loop over each market to find the matching id, then loop over each of its participants.
foreach ($xml->response->williamhill->class->type->market as $market) {
if($market->attributes()->id == $_GET['id']) {
foreach($market->participant as $participant) {
$participant_attributes = $participant->attributes();
echo "<tr>";
// EVENT NAME
echo "<td>";
echo "<a href=".$market->attributes()->url.">";
echo $participant_attributes['name'];//participants name
echo "</a>";
echo"</td>";
//ODDS
echo "<td>";
echo $participant_attributes['odds'];
echo "</td>";
echo "</tr>";
}
break; // <-- we've found the target and echo'ed it so no need to keep looping
}
}