src/ReflectionController.php
public function hasChildController($controllerName)
    {
        $methodName = $this->parseControllerName($controllerName);
        return $this->reflection->hasMethod($methodName);
    }
public function hasChildController($controllerName)
    {
        $methodName = $this->parseControllerName($controllerName);
        return $this->reflection->hasMethod($methodName);
    }
Check if the named controller exists as a child of this controller.

Takes the requested child controller name and checks for a corresponding
class method name. (Note: The class method will end with the word
Controller)

@param $controllerName
@return bool