$compartment = "2";
$files = glob("/path/to/files/$compartment.*"); // Will find 2.txt, 2.php, 2.gif
// Process through each file in the list
// and output its extension
if (count($files) > 0)
foreach ($files as $file)
{
$info = pathinfo($file);
echo "File found: extension ".$info["extension"]."<br>";
}
else
echo "No file name exists called $compartment. Regardless of extension."
by the way, what you are doing above is crying for a loop. Don' repeat your code blocks, but wrap one of them into this:
$compartments = array(1, 3, 6, 9); // or whichever compartments
// you wish to run through
foreach ($compartments as $compartment)
{
..... insert code here .......
}