问如何将foreach循环限制为四个循环

EN

        $scraper = new DOMScraper();
       $scraper->setSite('http://anywebsite.com/testig12.aspx')->setSource();
        Class DOMScraper extends DOMDocument{
        public $site;
        private $source;
        private $dom;

    function __construct(){
    libxml_use_internal_errors(true);
    $this->preserveWhiteSpace = false;
    $this->strictErrorChecking = false;
}

function setSite($site){
    $this->site = $site;
    return $this;
}

 function setSource(){
     if(empty($this->site))return 'Error: Missing $this->site, 
     use  setSite() first';
     $this->source = $this->get_data($this->site);
     return $this;
 }

 function getInnerHTML($tag, $id=null, $nodeValue = false){
    if(empty($this->site))return 'Error: Missing $this->source, 
    use setSource() first';
    $this->loadHTML($this->source);
    $tmp = $this->getElementsByTagName($tag);
    $ret = null;
    foreach ($tmp as $v){ 
        if($id !== null){
            $attr = explode('=',$id);
            if($v->getAttribute($attr[0])==$attr[1]){
                if($nodeValue == true){
                    $ret .= trim($v->nodeValue);
                }else{
                    $ret .= $this->innerHTML($v);
                }
            }
        }else{
            if($nodeValue == true){
                $ret .= trim($v->nodeValue);
            }else{
                $ret .= $this->innerHTML($v);
            }
        }
    }
    return $ret;
 }

 function innerHTML($dom){
    $ret = "";
    $nodes = $dom->childNodes;
    foreach($nodes as $v){
        $tmp = new DOMDocument();
        $tmp->appendChild($tmp->importNode($v, true));
        $ret .= trim($tmp->saveHTML());
    }
    return $ret;
 }

  function get_data($url){
    if(function_exists('curl_init')){
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
        curl_setopt($ch, CURLOPT_TIMEOUT, 5);
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        $data = curl_exec($ch);
        curl_close($ch);
        return $data;
    }else{
        return file_get_contents($url);
    }
}
  }
  ?>

 <?php echo '<div>'.$scraper->getInnerHTML('div','id=LeftDiv12').'</div>'; ?>