Magento:: current url, category, product

   >>   mage::helper('core/url')->getCurrentUrl(); 

         //  It will show the current url     

   >>   mage::helper('core/url')->getHomeUrl();   

        //  It will show the home url    

   >> Current category ::
         $cat = Mage::registry('current_category');
         echo $cat->getName();

  >> Current Product ::
         $_product = Mage::registry('current_product');
       

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