check whether on product page or category - Magento

The easy and fastest way to check whether you are on product page or category page is to check the registry to see if we have a single product that we are looking at:

<?php 

if(Mage::registry('current_product')) {
  
  echo "You are on product page" ;

} else {
  echo "You are outside the product page";
}

?>

For any Category / Product page, you are getting the ID from

<?php
Mage::app()->getRequest()->getParam('id');
$product = Mage::getModel('catalog/product')
               ->load(Mage::app()->getRequest()->getParam('id'));
if(!empty($product->getSku())) {
    echo 'Inside the Product page definitely';
}

This method works, but less faster than the above one. 


You can also check the page type (category or product) by reading the controller name:
Mage::app()->getRequest()->getControllerName(); 
if($this->getRequest()->getControllerName()=='product') {
echo "You are on product page" ; 
}
if($this->getRequest()->getControllerName()=='category'){
 echo "You are on category page";
}

 ?>