Curl Cache Idea

$cacheDir = './cache/';
$curl_setopt_array = array( CURLOPT_FOLLOWLOCATION => true, CURLOPT_RETURNTRANSFER => true);


if (file_exists($cacheDir.$filename)) {
	$timetable_view_file = file_get_contents($cacheDir.$filename);
}else{
	$curlR = curl_init($request_url);
	if (curl_setopt_array($curlR, $curl_setopt_array)){ 
		$timetable_view_file = curl_exec($curlR);
                //save new found file to disk, it's kept in memory too.
		file_put_contents($cacheDir.$filename,$timetable_view_file); 
		curl_close($curlR); 
	}
}