Генерирование meta description из описания товара "на лету" - SEO

setMetaData($product->meta_title, $product->meta_keyword, $product->meta_description);

        if ($product->meta_description =="") {
        $new_descr = $product->name.",".strip_tags($product->description);
        $new_descr =  substr($new_descr , 0, 151);
        setMetaData($product->meta_title, $product->meta_keyword, $new_descr );
        } else {
        setMetaData($product->meta_title, $product->meta_keyword, $product->meta_description);
        }

if ($product->meta_keyword ==""){
        $new_keyw =$category->name." ".$product->name;
        $new_keyw =str_replace('"' , "", $new_keyw);
		setMetaData($product->meta_title, $new_keyw, $new_descr );}

$doc = JFactory::getDocument();
$descr = getDescription(). formatprice($this->product->getPriceCalculate());
$doc->setDescription($descr);

<?php
$doc = JFactory::getDocument();
$descr = $doc->getMetadata('description');
$price_descr = $descr.' Цена '. round(getPriceFromCurrency($this->product->min_price, $this->product->currency_id), 2).' грн.';
$doc->setMetadata('description', $price_descr);
?>

$price_descr = $descr . ' ' . _JSHOP_PRICE . ' ' . formatprice(getPriceFromCurrency($this->product->min_price, $this->product->currency_id));

<?php
$doc = JFactory::getDocument();
$descr = $doc->getMetadata('description');
$price_descr =  $descr . ' ' . _JSHOP_PRICE . ' ' . strip_tags(formatprice(getPriceFromCurrency($this->product->min_price, $this->product->currency_id)));
$doc->setMetadata('description', $price_descr);
?>