$path = "/path/to/my/dir";
$latest_ctime = 0;
$latest_filename="";
$d = dir($path);
while (false !== ($entry = $d->read())) {
$filepath = "{$path}/{$entry}";
// could do also other checks than just checking whether the entry is a file
if (is_file($filepath) && filectime($filepath) > $latest_ctime) {
$latest_ctime = filectime($filepath);
$latest_filename = $entry;
}
}
// now $latest_filename contains the filename of the file that changed last