og-tc

<?php
defined('_JEXEC') or die;

$doc = JFactory::getDocument();
// $og_title
$og_title = trim($this->item->title);
// $og_site_name
$og_site_name = $siteName;
// $og_url
$og_url = $surl;
// $og_description
$og_description = $intro;
// $og_type
$og_type = "article";


// add declarations
$doc->addCustomTag('<meta name="twitter:card" content="summary_large_image" />');
$doc->addCustomTag('<meta name="twitter:site" content="@CarlosL24295" />');
$doc->addCustomTag('<meta property="og:title"  content="'.$og_title.'"/>');
$doc->addCustomTag('<meta property="og:site_name" content="'.$og_site_name.'"/>');
$doc->addCustomTag('<meta property="og:url" content="'.$og_url.'"/>');
$doc->addCustomTag('<meta property="og:description" content="'.$og_description.'"/>');
$doc->addCustomTag('<meta property="og:image" content="'.$base.$introImg.'"/>');
$doc->addCustomTag('<link rel="image_src" href="'.$introImg.'"/>');
$doc->addCustomTag('<meta property="og:type" content="'.$og_type.'"/>');