code: function(asInterface) {
      const result = [-1, -1, -1];
      if (this.is("T_MEMBER_FLAGS")) {
        let idx = 0,
          val = 0;
        do {
          switch (this.token) {
            case this.tok.T_PUBLIC:
              idx = 0;
              val = 0;
              break;
            case this.tok.T_PROTECTED:
              idx = 0;
              val = 1;
              break;
            case this.tok.T_PRIVATE:
              idx = 0;
              val = 2;
              break;
            case this.tok.T_STATIC:
              idx = 1;
              val = 1;
              break;
            case this.tok.T_ABSTRACT:
              idx = 2;
              val = 1;
              break;
            case this.tok.T_FINAL:
              idx = 2;
              val = 2;
              break;
          }
          if (asInterface) {
            if (idx == 0 && val == 2) {
              // an interface can't be private
              this.expect([this.tok.T_PUBLIC, this.tok.T_PROTECTED]);
              val = -1;
            } else if (idx == 2 && val == 1) {
              // an interface cant be abstract
              this.error();
              val = -1;
            }
          }
          if (result[idx] !== -1) {
            // already defined flag
            this.error();
          } else if (val !== -1) {
            result[idx] = val;
          }
        } while (this.next().is("T_MEMBER_FLAGS"));
      }
  
      if (result[1] == -1) result[1] = 0;
      if (result[2] == -1) result[2] = 0;
      return result;
    }
docs: Read member flags
  @return array
  1st index : 0 => public, 1 => protected, 2 => private
  2nd index : 0 => instance member, 1 => static member
  3rd index : 0 => normal, 1 => abstract member, 2 => final member