Open Graph metadata - SEO

<?php
# HD-OG   3     	          	          	              
# Copyright (C) 2013 by Hyde-Design  	   	   	   	   
# Homepage   : www.hyde-design.co.uk		   	   	   
# Author     : Hyde-Design    		   	   	   	   
# Email      : sales@hyde-design.co.uk 	   	   	   
# Version    : 3.2                        	   	    	
# License    : http://www.gnu.org/copyleft/gpl.html GNU/GPL  

// no direct access
defined('_JEXEC') or die('Restricted access');
$buffer = JResponse::getBody();
jimport('joomla.plugin.plugin');
jimport('joomla.application.component.model');




class plgSystemHD_OG extends JPlugin
{function plgSystemHD_OG(&$subject, $config)	{parent::__construct($subject, $config);	
	$this->_plugin = JPluginHelper::getPlugin( 'system', 'HD_OG' );
	}
	
	function onAfterRender()
	{ $element_url = '/administrator/'; $current_url = $_SERVER['REQUEST_URI'];
	global $mainframe;
	$buffer = JResponse::getBody();
	if (strstr($current_url, $element_url)) {;} else {
	
	$document = &JFactory::getDocument();
	$app = JFactory::getApplication();

	$hdog_title_tmp = $document->getTitle();
	$hdog_title = '
<meta property="og:title" content="'.$hdog_title_tmp.'"/>
';
	$hdog_type_tmp = $this->params->get( 'hdog_type' );
	$hdog_type =  '<meta property="og:type" content="'.$hdog_type_tmp.'"/>
';
	$hdog_base = $document->getBase();
	$hdog_url =   '<meta property="og:url" content="'.$hdog_base.'"/>
';

	//get thumbnail image
	$doc = new DOMDocument();
@$doc->loadHTML($buffer);
$images = $doc->getElementsByTagName('img');
if (strlen($hdog_base) <= 26) 
{
    $image = $images->item(0)->getAttribute('src');
} 
else 
{
    $image = $images->item(1)->getAttribute('src');
}
if (substr($image, 0, 4)!= 'http') $image = JURI::base().$image;
$hdog_image =   '<meta property="og:image" content="'.$image.'" />
';

	
        //check article view

        $view =JRequest::getVar('view'); 
        if ($view == "article") {
        $articlesModel = JModel::getInstance('ContentModelArticle'); 
        $articleId = JRequest::getInt('id', 0); 
        $hdog_image_thumb = '<meta property="og:image" content="'.$articleId.'" />
';            $article = $articlesModel->getItem($articleId); 
              $imagesCode = $article->images; $thumbCode = str_replace("\/", "/", $imagesCode); $thumb = explode('"', $thumbCode); $thumb_img = $thumb[03];
              if (!empty($thumb_img)) {$hdog_image_thumb = '<meta property="og:image" content="'.JURI::base().$thumb_img.'" />
';}           else {$hdog_image_thumb = '<meta property="og:image" content="'.JURI::base().$hdog_image_tmp.'" />
';}}          
        //check category view
        if ($view == "category") {
        $categoriesModel = JModel::getInstance('ContentModelCategories'); 
        $category = JRequest::getVar('id'); 
        $category = '9';
        $db = JFactory::getDbo();
        $query = $db->getQuery(true);
         $query->select ('alias');
         $query->from('#__categories');
         $query->where('id=$category');

             $db->setQuery($query);
             $results = $db->loadObjectList();

             
//       echo 'xx '.$results.' xx';
                 
        };
         $hdog_image_thumb = '<meta property="og:image" content="'.$categoryId.'" />
';            
              
			  if (!empty($thumb_img)) {$hdog_image_thumb = '<meta property="og:image" content="'.JURI::base().$thumb_img.'" />
';}           else {$hdog_image_thumb = ''.$hdog_image.'
';};

        //get meta description
	$hdog_desc_tmp = $document->getDescription();
	$hdog_desc =   '<meta property="og:description" content="'.$hdog_desc_tmp.'" />
';

        //get site name
	$hdog_name_tmp = $app->getCfg('sitename'); 
        $hdog_name =   '<meta property="og:site_name" content="'.$hdog_name_tmp.'" />
';

        //get locale
        $lang =& JFactory::getLanguage(); $sitelanguage = $lang->getTag(); $oglanguage = str_replace ('-', '_', $sitelanguage);
	$hdog_locale = '<meta property="og:locale" content="'.$oglanguage.'"/>
';
        
        //get admin id
	$hdog_admins_tmp = $this->params->get( 'hdog_admins' );
        $hdog_admins =   '<meta property="fb:admins" content="'.$hdog_admins_tmp.'"/>
';

        // render all to screen
	$hdog_all = $hdog_title.$hdog_type.$hdog_url.$hdog_image_thumb.$hdog_desc.$hdog_name.$hdog_locale;
	$use_admin = $this->params->get( 'use_admin' );
	if ($use_admin == '1') {$hdog_all = $hdog_all.$hdog_admins;}
        $buffer = str_replace ('<html xmlns="http://www.w3.org/1999/xhtml"', '<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:og="http://ogp.me/ns#"
      xmlns:fb="http://www.facebook.com/2008/fbml" ', $buffer);
	    $buffer = str_replace ('</title>', '</title>'.$hdog_all, $buffer);
			
		JResponse::setBody($buffer);
		return true;
	}}}

public function fetchHead

meta name

<meta property="og:title" content="Heidi Klum Парфюмерная серия - Компания LR Украина "/>
<meta property="og:type" content="website"/>
<meta property="og:url" content="http://lr-company.com.ua/katalog/heidi-klum/heidi-klum-parfyumernaya-seriya"/>
<meta property="og:image" content="http://lr-company.com.ua/" />
<meta property="og:description" content="Heidi Klum Парфюмерная серия" />
<meta property="og:site_name" content="Компания LR Украина " />
<meta property="og:locale" content="ru_RU"/>

$buffer .= $tab . '<meta property="og:description" content="' . htmlspecialchars($documentDescription). '" />' . $lnEnd;
$buffer .= $tab . '<meta property="og:title" content="' . htmlspecialchars($document->getTitle(), ENT_COMPAT, 'UTF-8'). '"/>' . $lnEnd;
$buffer .= $tab . '<meta property="og:url" content="' . $document->getBase(). '" />' . $lnEnd;
$buffer .= $tab . '<meta property="og:site_name" content="EGGoup CCTV" />' . $lnEnd;
$buffer .= $tab . '<meta property="og:type" content="website" />' . $lnEnd;