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        // Iterate over all conditions and compare them to the entity

        // properties. We cannot use array_diff_assoc() here since the

        // conditions can be nested arrays, too.

        foreach ($conditions as $property_name => $condition) {

          if (is_array($condition)) {

            // Multiple condition values for one property are treated as OR

            // operation: only if the value is not at all in the condition array

            // we remove the entity.

            if (!in_array($entity->{$property_name}, $condition)) {

              unset($entities[$entity->{$this->idKey}]);

              continue 2;

            }

          }

          elseif ($condition != $entity->{$property_name}) {

            unset($entities[$entity->{$this->idKey}]);

            continue 2;

          }