I encountered a problem when using PHP chain calls:
There is a class "Site" below:

api = new Api(); return $this->api; } } ?>

There is also a class "Api" located in "class.Api.php":

Use the following code to instantiate:

$site = new Site();

Call the following code again:

$site->api()->auth(); $site->api()->render();

Will PHP repeat require() and create new object API? If so, require() can be replaced by require_once(), but how to make "$site->api()" return the same object? Thanks!