protected function get_filepicker_unique_id() : string {
        if (empty($this->filepickeruniqueid)) {
            $this->filepickeruniqueid = uniqid();
        }
        return $this->filepickeruniqueid;
    }
protected function get_filepicker_unique_id() : string {
        if (empty($this->filepickeruniqueid)) {
            $this->filepickeruniqueid = uniqid();
        }
        return $this->filepickeruniqueid;
    }
protected function get_filepicker_unique_id ( ) : string { if ( empty ( $ this -> filepickeruniqueid ) ) { $ this -> filepickeruniqueid = uniqid ( ) ; } return $ this -> filepickeruniqueid ; }
Returns the unique id of the file picker associated with this url element, setting it in the process if not set.

@return string the unique id of the file picker.
Returns the unique id of the file picker associated with this url element setting it in the process if not set .