public function marshal($value)
    {
        if ($value === null || $value === '' || is_array($value)) {
            return null;
        }

        return (string)$value;
    }
public function marshal($value)
    {
        if ($value === null || $value === '' || is_array($value)) {
            return null;
        }

        return (string)$value;
    }
public function marshal ( $ value ) { if ( $ value === null || $ value === '' || is_array ( $ value ) ) { return null ; } return ( string ) $ value ; }
Marshals request data into a PHP string

@param mixed $value The value to convert.
@return string|null Converted value.
Marshals request data into a PHP string