//Insert canonical link in HTML head if not empty foreach ($this->item->jcfields as $field) { //Replace X with the Canonical URL field ID number if ($field->id === '1') { //Makes sure the Canonical URL field is not empty if (!empty($field->rawvalue)) { //Inserts the Canonical URL field content with markup into the HTML head $canUrl = ''; $document = JFactory::getDocument(); $document->addCustomTag($canUrl); } continue; } };