code: func (c *Context) GetPostFormArray(key string) ([]string, bool) {
  	req := c.Request
  	if err := req.ParseMultipartForm(c.engine.MaxMultipartMemory); err != nil {
  		if err != http.ErrNotMultipart {
  			debugPrint("error on parse multipart form array: %v", err)
  		}
  	}
  	if values := req.PostForm[key]; len(values) > 0 {
  		return values, true
  	}
  	if req.MultipartForm != nil && req.MultipartForm.File != nil {
  		if values := req.MultipartForm.Value[key]; len(values) > 0 {
  			return values, true
  		}
  	}
  	return []string{}, false
  }
docs: // GetPostFormArray returns a slice of strings for a given form key, plus
  // a boolean value whether at least one value exists for the given key.