code: public static function getUoms()
      {
          if (!isset(static::$uoms)) {
              static::$uoms = json_decode(
                  utf8_encode(
                      file_get_contents(__DIR__.'/uoms.json')
                  ),
                  true
              );
          }
  
          return static::$uoms;
      }
docs: Get uoms
  
  @author Tom Haskins-Vaughan <tom@tomhv.uk>
  @since  0.3.0
  
  @return array