registerClass() — register a class for use in the templates
void registerClass(string class_name,
                   string class_impl);
   Smarty allows you to access static classes from templates as long as the 
   Security Policy does not
   tell it otherwise. If security is enabled, classes registered with 
   registerClass() are accessible to templates.
  
Example 14.36. Register class for use within a template
<?php
class Bar {
  $property = "hello world";
}
$smarty = new Smarty();
$smarty->registerClass("Foo", "Bar");
   
{* Smarty will access this class as long as it's not prohibited by security *}
{Bar::$property}
{* Foo translates to the real class Bar *}
{Foo::$property}
   
Example 14.37. Register namespaced class for use within a template
<?php
namespace my\php\application {
  class Bar {
    $property = "hello world";
  }
}
$smarty = new Smarty();
$smarty->registerClass("Foo", "\my\php\application\Bar");
   
{* Foo translates to the real class \my\php\application\Bar *}
{Foo::$property}
   
   See also
   registerObject(),
   and
   Security.