Suppose we want to get all information of login User like Full Name, First Name, Middle Name, Last Name etc. We can also check user registration date, Date of Birth and many more information. Below is code to display information of customer.

// Check if any customer is logged in or not
if (Mage::getSingleton('customer/session')->isLoggedIn()) {
// Load the customer's data
$customer = Mage::getSingleton('customer/session')->getCustomer();
$customer->getPrefix();
$customer->getName(); // Full Name
$customer->getFirstname(); // First Name
$customer->getMiddlename(); // Middle Name
$customer->getLastname(); // Last Name
$customer->getSuffix();
// All other customer data
$customer->getWebsiteId(); // ID
$customer->getEntityId(); // ID
$customer->getEntityTypeId(); // ID
$customer->getAttributeSetId(); // ID
$customer->getEmail();
$customer->getGroupId(); // ID
$customer->getStoreId(); // ID
$customer->getCreatedAt(); // yyyy-mm-ddThh:mm:ss+01:00
$customer->getUpdatedAt(); // yyyy-mm-dd hh:mm:ss
$customer->getIsActive(); // 1
$customer->getDisableAutoGroupChange();
$customer->getTaxvat();
$customer->getPasswordHash();
$customer->getCreatedIn(); // Admin
$customer->getGender(); // ID
$customer->getDefaultBilling(); // ID
$customer->getDefaultShipping(); // ID
$customer->getDob(); // yyyy-mm-dd hh:mm:ss
$customer->getTaxClassId(); // ID
}