k2 component thumbs fetch - joomla

$thumbtempsrc                       = JPATH_ROOT.DIRECTORY_SEPARATOR.'media'.DIRECTORY_SEPARATOR.'k2'.DIRECTORY_SEPARATOR.'items'.DIRECTORY_SEPARATOR.'cache'.DIRECTORY_SEPARATOR.md5("Image".$item->id).'_L.jpg';
                        $img_temp     = false;
                        if(file_exists($thumbtempsrc)){
                           $img_temp     = true;
                           $imgpath      = JURI::base().'/media/k2/items/cache/'.md5('Image'.$item->id).'_L.jpg';
                        }

                        if(!$img_temp){
                            $img_temp    = preg_match_all('/<img.+src=[\'"]([^\'"]+)[\'"].*>/i', $item->introtext,$matches)?true
                                          :preg_match_all('/<img.+src=[\'"]([^\'"]+)[\'"].*>/i', $item->fulltext,$matches);
                            $imgpath     = ($img_temp ? $matches[1][0]:'');
                        }

                        $singlarticletemp->image = $imgpath ? $imgpath:'';

                        if($singlarticletemp->image && strpos($singlarticletemp->image,'http') === false){
                            $singlarticletemp->image = JURI::base().$singlarticletemp->image;
                        }