Getting URL of a current page you are visiting or working on is a common requirement in any web development project. There are various ways you can get the current URL of a page in Magento. Here are some :-
From Mage_Core_Helper_Url class
$currentUrl = Mage::helper('core/url')->getCurrentUrl();
From Mage_Core_Model_Store class
$currentUrl = Mage::app()->getStore()->getCurrentUrl(false);
If you want to get the root URL of your Magento shop then you can use the following code:
// Gives the base url of your magento installation
$baseUrl = Mage::getBaseUrl();
// Gives the url of media directory
$mediaUrl = Mage::getBaseUrl('media');
Another way to get current url
$urlRequest = Mage::app()->getFrontController()->getRequest();
$urlPart = $urlRequest->getServer('ORIG_PATH_INFO');
if(is_null($urlPart))
{
$urlPart = $urlRequest->getServer('PATH_INFO');
}
$urlPart = substr($urlPart, 1 );
$currentUrl = $this->getUrl($urlPart);