[jchamber2010]

PHP Code:

<?php
$fileN = "check.txt";
$filename = "/public_html/serverchecks/$fileN";

if (file_exists($filename)) {
    exit();

}else{

$ourFileHandle = fopen($filename, 'w') or die("can't open file");
fclose($ourFileHandle);

}

// Script code HERE

unlink($filename); 

?>

That should work now, you were using the wrong variable... I think, however I haven't time to test it, so hope that works for you.