You may have a lot of class that you need to load 1)
It's the case when building an object-oriented applications PHP where there is one source file per class definition.
You may write a long list of require/includes at the beginning of each script (one for each class) but this is cumbersome.
You may register a function with the spl_autoload_register() that will be called when a class is not found.
Class exist Method
class-exists second argument permits to control if the autoload registered method are called or not
require_once './vendor/autoload.php'; use Module\Class\Path\Hello echo Hello.get();