Someone

<?php
$file1 = file("http://www.stubhub-feeds.com/datafeeds/Full_Affiliate_Feed.csv");
$file2 = file("http://www.stubhub-feeds.com/datafeeds/Prices_Feed.csv");
$i = 0;
foreach($file1 as $val){
	$parts = explode(",", $val);
	$ids[$parts[12]][] = $parts;
}
foreach($file2 as $val){
	$parts = explode(",", $val);
	$ids[$parts[0]][] = $parts[1];
	$ids[$parts[0]][] = $parts[2];
}
print_r($ids)
?>