scandir('./application/files');

if ($handle = opendir('./application/files')) {

    while (false !== ($entry = readdir($handle))) {
        
	if ( $entry != "." && $entry != ".." ) {
		echo '<a href="'. $entry .'">Скачать вложение</a>';
	}
	
    }

    closedir($handle);
}

$f = './news';
$arr = scandir($f);
for($i = 2; $i < count($arr); $i++)
    echo '<a href="'. $arr[$i] .'">Скачать вложение</a><br />';

for($i = 2; $i < count($arr); $i++)

 $arr = array(1, 2, 3, 4, 5);
 
 for($i = 0; $i < count($arr); $i++){
     echo '$arr['.$i.'] => '.$arr[$i]."<br />";
     if($i == 3 ) $arr[] = 6;
 }

$arr[0] => 1
$arr[1] => 2
$arr[2] => 3
$arr[3] => 4
$arr[4] => 5
$arr[5] => 6