$filename = 'tempfile.tmp';

$handler = fopen($filename, 'a');

fwrite($handler, 'some data');
fclose($handler);


clearstatcache(); //clear filesystem cache

// 1.
if (file_exists($filename)) {
    unlink($filename); // error faili pole
}

// 2.
echo file_exists($filename);
unlink($filename); // õnnestus