Invece di aggiungere manualmente il codice in head.phtml, potresti farlo in un modulo che è molto più pulito e flessibile.
app / code / local / SE / Ogmeta / blocchi / Html / head.php
<?php
/**
* Class StackExchange_Ogmeta_Block_Html_Head
*/
class SE_Ogmeta_Block_Html_Head extends Mage_Page_Block_Html_Head
{
public function _construct()
{
$this->setTemplate('se_og_meta/meta.phtml');
}
protected function _prepareLayout()
{
try {
$baseUrl = Mage::getBaseUrl(Mage_Core_Model_Store::URL_TYPE_MEDIA);
$storeId = $this->helper('core')->getStoreId();
$coreStringHelper = Mage::helper('core/string');
if ($currentProduct = Mage::registry('current_product')) {
$title = $currentProduct->getMetaTitle();
$description = $currentProduct->getMetaDescription();
$productName = $currentProduct->getName();
$amount = $currentProduct->getFinalPrice();
$productDescription = $currentProduct->getDescription();
$productImages = $currentProduct->getMediaGalleryImages();
$currency = Mage::app()->getStore()->getCurrentCurrencyCode();
if ($title) {
$this->setOgTitle($title);
} else {
$this->setOgTitle($coreStringHelper->substr($productName, 0, 255));
}
if ($description) {
$this->setOgDescription($description);
} else {
$this->setOgDescription(
$coreStringHelper->substr(
$coreStringHelper->stripTags($productDescription), 0, 255
)
);
}
foreach ($productImages->getItems() as $image) {
$images[] = $baseUrl . 'catalog/product' . $image->getFile();
}
if ($images) {
$this->setImages($images);
}
if ($amount) {
$this->setOgAmount($amount);
}
if ($currency) {
$this->setOgCurrency($currency);
}
} elseif ($currentCategory = Mage::registry('current_category')) {
$title = $currentCategory->getMetaTitle();
$categoryName = $currentCategory->getName();
$categoryMetaDescription = $currentCategory->getMetaDescription();
$categoryDescription = $currentCategory->getDescription()
$categoryThumbnail = $currentCategory->getThumbnail();
if ($title) {
$this->setOgTitle($title);
} else {
$this->setOgTitle($coreStringHelper->substr($categoryName, 0, 255));
}
if ($categoryMetaDescription) {
$this->setOgDescription($categoryMetaDescription);
} else {
$this->setOgDescription($coreStringHelper->substr($coreStringHelper->stripTags($categoryDescription)), 0, 255));
}
if ($categoryThumbnail) {
$this->setImages([$baseUrl . 'catalog/category/' . $image]);
}
}
$this->setCurrentUrl($this->helper('core/url')->getCurrentUrl());
$title = $this->getOgTitle();
if (!$title) {
$this->setOgTitle(Mage::getStoreConfig('design/og_meta_head/og_default_title', $storeId));
}
$description = $this->getOgDescription();
if (!$description) {
$this->setOgDescription(Mage::getStoreConfig('design/og_meta_head/og_default_description', $storeId));
}
$images = $this->getImages();
if (!$images) {
$this->setImages([$baseUrl . 'ogmeta/' . Mage::getStoreConfig('design/og_meta_head/og_default_image', $storeId)]);
}
} catch (Exception $e) {
Mage::log($e->getMessage());
}
}
}
app / code / local / SE / Ogmeta / etc / config.xml
<?xml version="1.0"?>
<config>
<modules>
<SE_Ogmeta>
<version>0.1.0</version>
</SE_Ogmeta>
</modules>
<global>
<blocks>
<se_ogmeta>
<class>SE_Ogmeta_Block</class>
</se_ogmeta>
</blocks>
<helpers>
<se_ogmeta>
<class>SE_Ogmeta_Helper</class>
</se_ogmeta>
</helpers>
<models>
<se_ogmeta>
<class>SE_Ogmeta_Model</class>
</se_ogmeta>
</models>
</global>
<frontend>
<layout>
<updates>
<se_ogmeta>
<file>se_og_meta.xml</file>
</se_ogmeta>
</updates>
</layout>
</frontend>
</config>
app / code / local / SE / Ogmeta / etc / system.xml
<config>
<sections>
<design translate="label">
<groups>
<og_meta_head translate="label" module="se_ogmeta">
<label>OG Meta Head</label>
<frontend_type>text</frontend_type>
<sort_order>30</sort_order>
<show_in_default>1</show_in_default>
<show_in_website>1</show_in_website>
<show_in_store>1</show_in_store>
<fields>
<og_default_image translate="label comment">
<label>OG Meta Default Image</label>
<comment>Allowed file types: PNG, GIF, JPG, JPEG. Not all browsers support all these formats!</comment>
<frontend_type>image</frontend_type>
<backend_model>se_ogmeta/system_config_backend_image_metaimage</backend_model>
<base_url type="media" scope_info="1">ogmeta</base_url>
<sort_order>5</sort_order>
<show_in_default>1</show_in_default>
<show_in_website>1</show_in_website>
<show_in_store>1</show_in_store>
</og_default_image>
<og_default_title translate="label">
<label>OG Meta Default Title</label>
<frontend_type>text</frontend_type>
<sort_order>10</sort_order>
<show_in_default>1</show_in_default>
<show_in_website>1</show_in_website>
<show_in_store>1</show_in_store>
</og_default_title>
<og_default_description translate="label">
<label>OG Meta Default Description</label>
<frontend_type>textarea</frontend_type>
<sort_order>20</sort_order>
<show_in_default>1</show_in_default>
<show_in_website>1</show_in_website>
<show_in_store>1</show_in_store>
</og_default_description>
</fields>
</og_meta_head>
</groups>
</design>
</sections>
</config>
htdocs / app / code / local / SE / Ogmeta / Helper / Data.php
<?php
class SE_Ogmeta_Helper_Data extends Mage_Core_Helper_Data
{
}
app / code / local / SE / Ogmeta / modello / sistema / Config / backend / Immagine / Metaimage.php
/**
* System config image field backend model for Zend PDF generator
*/
class SE_Ogmeta_Model_System_Config_Backend_Image_Metaimage extends Mage_Adminhtml_Model_System_Config_Backend_Image
{
/**
* The tail part of directory path for uploading
*/
const UPLOAD_DIR = 'ogmeta';
/**
* Token for the root part of directory path for uploading
*/
const UPLOAD_ROOT = 'media';
/**
* Return path to directory for upload file
* @return string
* @throw Mage_Core_Exception
*/
protected function _getUploadDir()
{
$uploadDir = $this->_appendScopeInfo(self::UPLOAD_DIR);
$uploadRoot = $this->_getUploadRoot(self::UPLOAD_ROOT);
$uploadDir = $uploadRoot . '/' . $uploadDir;
return $uploadDir;
}
/**
* Makes a decision about whether to add info about the scope.
* @return boolean
*/
protected function _addWhetherScopeInfo()
{
return true;
}
/**
* Getter for allowed extensions of uploaded files.
* @return array
*/
protected function _getAllowedExtensions()
{
return ['png', 'gif', 'jpg', 'jpeg', 'apng', 'svg'];
}
/**
* Get real media dir path
* @param $token
* @return string
*/
protected function _getUploadRoot($token)
{
return Mage::getBaseDir($token);
}
}
app / design / frontend / base / default / layout / se_og_meta.xml
<?xml version="1.0"?>
<layout version="0.1.0">
<default>
<reference name="head">
<block type="se_ogmeta/html_head" name="ogmeta" />
</reference>
</default>
</layout>
app / design / frontend / base / default / template / se_og_meta / meta.phtml
<?php
/**
* Template for SE_Ogmeta_Head
*/
?>
<meta name="og:title" content="<?php echo $this->escapeHtml($this->getOgTitle()) ?>"/>
<meta name="og:url" content="<?php echo $this->escapeHtml($this->getCurrentUrl()) ?>"/>
<meta name="og:type" content="website"/>
<?php if (count($this->getImages()) > 0) : ?>
<?php foreach ($this->getImages() as $image) : ?>
<meta name="og:image" content="<?php echo $this->escapeHtml($image) ?>"/>
<?php endforeach; ?>
<?php endif; ?>
<meta name="og:description" content="<?php echo $this->escapeHtml($this->getOgDescription()) ?>"/>
<?php if ($this->getOgAmount() && $this->getOgCurrency()): ?>
<meta property="og:price:amount" content="<?php echo $this->escapeHtml($this->getOgAmount()) ?>" />
<meta property="og:price:currency" content="<?php echo $this->escapeHtml($this->getOgCurrency()) ?>" />
<?php endif; ?>
app / etc / modules / SE_Ogmeta.xml
<?xml version="1.0"?>
<config>
<modules>
<SE_Ogmeta>
<active>true</active>
<codePool>local</codePool>
</SE_Ogmeta>
</modules>
</config>