protected static function makePostArray( eZHTTPTool $http, $key )
    {
        if ( $http->hasPostVariable( $key ) && $http->postVariable( $key ) !== '' )
        {
            $value = $http->postVariable( $key );
            if ( is_array( $value ) )
                return $value;
            elseif( strpos($value, ',') === false )
                return array( $value );
            else
                return explode( ',', $value );
        }
        return array();
    }