code: public function getAssessmentItemRefsByPlaceholder(\tao_models_classes_service_StorageDirectory $privateCompilationDirectory, AssessmentItemRef $placeholder)
      {
          $urlinfo = parse_url($placeholder->getHref());
          $adaptiveSectionId = ltrim($urlinfo['path'], '/');
          
          $compilationDataService = $this->getServiceLocator()->get(CompilationDataService::SERVICE_ID);
          $filename = "adaptive-assessment-section-${adaptiveSectionId}";
          
          $component = $compilationDataService->readPhpCompilationData(
              $privateCompilationDirectory,
              "${filename}.php",
              $filename
          );
  
          return $component->getComponentsByClassName('assessmentItemRef')->getArrayCopy();
      }
docs: Get AssessmentItemRefs corresponding to a given Adaptive Placeholder.
  
  This method will return an array of AssessmentItemRef objects corresponding to an Adaptive Placeholder.
  
  @return array