$path = "/home/www/images/xml_cache"; 
$pattern = "/^images_album_6\S+.xml/i";
$latest_time = 0;
$latest_filename = '';
$iterator = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($path), RecursiveIteratorIterator::CHILD_FIRST);
foreach ($iterator as $file) {
    if ($file->isFile() && preg_match($pattern,$file->getFilename())) {
        if ($file->getMTime() > $latest_time) {
            $latest_time = $file->getMTime();
            $latest_filename = $file->getPathname();
        }
    }
}
print("Latest file: ".$latest_filename.PHP_EOL);

$path = "/home/www/images/xml_cache"; 
$nom="images_album_6*.xml";

  foreach (glob($path.'/'.$nom.'') as $filename) { }

$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;
	
	
  }
}
  }