eZ\Publish\Core\Base\Container\ApiLoader\FieldTypeCollectionFactory::getConcreteFieldTypesIdentifiers PHP Method

    public function getConcreteFieldTypesIdentifiers()
    {
        return $this->concreteFieldTypesIdentifiers;
    }

 /**
  * Returns a hash, with fieldType identifiers as keys and human readable names as values.
  *
  * @return array
  */
 private function getFieldTypeList()
 {
     $list = [];
     foreach ($this->fieldTypeCollectionFactory->getConcreteFieldTypesIdentifiers() as $fieldTypeIdentifier) {
         $list[$fieldTypeIdentifier] = $this->translator->trans("{$fieldTypeIdentifier}.name", [], 'fieldtypes');
     }
     asort($list, SORT_NATURAL);
     return $list;
 }