public static function setVaryByParam($actionName, $value) {
        if (!self::canCache($actionName)) { return; }
        self::$settings[$actionName]['varyByParam'] = $value;
    }
public static function setVaryByParam($actionName, $value) {
        if (!self::canCache($actionName)) { return; }
        self::$settings[$actionName]['varyByParam'] = $value;
    }
public static function setVaryByParam ( $ actionName , $ value ) { if ( ! self :: canCache ( $ actionName ) ) { return ; } self :: $ settings [ $ actionName ] [ 'varyByParam' ] = $ value ; }
Sets the vary-by-param value.

@param string $actionName Action name.
@param string $value A semicolon-separated list of strings that correspond to query-string values for the GET method, or to parameter values for the POST method.

@return void
Sets the vary - by - param value .