Omezení na určitý limit ve výpisu dat ze souboru

<?php
class AdrStr
{
  public $path;
  public $order;
  public $filtr;
  protected $struktura = array();
  protected $adr = array();
  protected $file = array();
  private $hn;

  public function __construct($path = "ulozene/")
  {
    $this->path = $path;
    $this->nacti();
  }

  public function nacti()
  {
    $this->hn = opendir($this->path);
    while(false!==($file = readdir($this->hn)))
    {
      if(!in_array($file, array(".", "..")))
        $this->struktura[$file] = filemtime($this->path.$file);
    }
    closedir($this->hn);
  }

  public function serad(&$s) // $this->order prijima name_asc|name_desc|time_asc|time_desc
  {
    if($this->order)
      switch($this->order)
      {
        case "name_asc": ksort($s); break;
        case "name_desc": krsort($s); break;
        case "time_asc": asort($s); break;
        case "time_desc": arsort($s); break;
      }
  }

  public function oddel()
  {
    foreach($this->struktura as $file => $q)
    {
      if(is_dir($this->path.$file))
        $this->adr[] = $file;
      else
        $this->file[] = $file;
    }
  }
    
  public function execute()
  {
      $this->serad($this->struktura);
      $this->oddel();
  }
  
  public function return_adr()
  {
    return $this->adr;
  }

  public function return_file()
  {
    return $this->file;
  }
}

$vr = new AdrStr();
$vr->order = "time_desc";
$vr->execute();
echo "<pre>";
print_r($vr->return_adr());
print_r($vr->return_file());
echo "</pre>";
?>