<?
function url_exists($url)
{
$handle = @fopen($url, "r");
if ($handle === false)
return false;
fclose($handle);
return true;
}

$link2 = "http://www.site.com/a.rar";

if(url_exists($link2)) {
echo "Program bulundu.";
} else {
echo "Program silinmiş.";
}
?>