markdown顾客

# CUSTOMER
### Name, Surname, Firstname...
```php
$firstName = $customer->getFirstname();
$lastName = $customer->getLastname();
$fullName = $customer->getName();
```
### Verify if there is someone logged in
```php
Mage::getSingleton(&＃39;customer/session&＃39;)->isLoggedIn();
```
### Get Group ID of logged in Customer
```php
Mage::getSingleton(&＃39;customer/session&＃39;)->getCustomerGroupId();
```