<?php
$dir = "Pfad/zu_den/Bildern";
if (is_dir($dir)) {
	if ($dh = opendir($dir)) {
		while (($filename2 = readdir($dh)) !== false) {
			if($filename2 != "." && $filename2 != ".." ) $files2[] = $filename2;
		}

		foreach ($files2 as $con1) {
  			$in[] = array(
		   'rest_1' => substr ( $con1, 6, 4 ),
	      'pre_1' => substr ( $con1, 11, 2 ),
	      'test_1' => $con1
	      );
		}

	   foreach($in as $key => $row) {
	      $array_rest_1[$key]   = $row['rest_1'];
	      $array_pre_1[$key]    = $row['pre_1'];
	   }

		array_multisort($array_rest_1,SORT_DESC,$array_pre_1,SORT_DESC,$in);

		$out = array();
		reset($in);
		while(list($key, $val) = each($in)){
			$out[] = $val['test_1'];
		}
		closedir($dh);
	}
}

$dieses_jahr = date("Y");
$aeltestes_jahr = '2010';
for($i = $dieses_jahr; $i >= $aeltestes_jahr; $i--) {
    $dateien[$i] = preg_grep("/.+$i/",$out);
     echo "<h1>Dateien aus $i</h1>";
    foreach ($dateien[$i] as $value) {
       echo "$value<br>";
   }
}
?>