修改magento页面的title，description等------------进而可以写一个descroption数组，让description随机生成-----方便seo，节省在添加产品的时候...

在对用的block文件中加入：一般是content最大的block里面设定，譬如：Mage_Catalog_Block_Category_View

protected function _prepareLayout()

{

parent::_prepareLayout();

$this->getLayout()->createBlock('catalog/breadcrumbs');

if ($headBlock = $this->getLayout()->getBlock('head')) {

$category = $this->getCurrentCategory();

if ($title = $category->getMetaTitle()) {

$headBlock->setTitle($title);

}

if ($description = $category->getMetaDescription()) {

$headBlock->setDescription($description);

}

if ($keywords = $category->getMetaKeywords()) {

$headBlock->setKeywords($keywords);

}

if ($this->helper('catalog/category')->canUseCanonicalTag()) {

$headBlock->addLinkRel('canonical', $category->getUrl());

}

/*

want to show rss feed in the url

*/

if ($this->IsRssCatalogEnable() && $this->IsTopCategory()) {

$title = $this->helper('rss')->__('%s RSS Feed',$this->getCurrentCategory()->getName());

$headBlock->addItem('rss', $this->getRssLink(), 'title="'.$title.'"');

}

}

return $this;

}

例子：

protected function _prepareLayout()

{

$this->getLayout()->createBlock('catalog/breadcrumbs');

if ($headBlock = $this->getLayout()->getBlock('head')) {

if ($title = $this->getProduct()->getMetaTitle()) {

$headBlock->setTitle($title);

}

//title =name以name当title。

else{$headBlock->setTitle($this->getProduct()->getName());}

if ($keyword = $this->getProduct()->getMetaKeyword()) {

$headBlock->setKeywords($keyword);

} elseif( $currentCategory = Mage::registry('current_category') ) {

//keyword 这里写keywords

$keywords ="Replica Watches, Rolex Watches";

$headBlock->setKeywords($keywords);

// $headBlock->setKeywords($this->getProduct()->getName());

}

if ($description = $this->getProduct()->getMetaDescription()) {

$headBlock->setDescription( ($description) );

} else {

//

$zz =$this->getProduct()->getName();

//$arr1 = array($zz."111",$zz."222",$zz."333",$zz."444",$zz."555",$zz."666");

//rand descroption array!这里写要随机出来的description。

$arr1 = array(

$zz." on sale",

$zz." for sale"

);

$ss = array_rand($arr1);

//

$headBlock->setDescription($arr1[$ss]);

//$headBlock->setDescription( $this->getProduct()->getDescription() );

}

}

return parent::_prepareLayout();

}