setSaveHandler(AbstractProxy|NativeSessionHandler|SessionHandlerInterface|null $saveHandler = null)
Registers session save handler as a PHP session handler.
To use internal PHP session save handlers, override this method using iniset with session.savehandler and session.save_path e.g.
ini_set('session.save_handler', 'files');
ini_set('session.save_path', '/tmp');
or pass in a NativeSessionHandler instance which configures session.save_handler in the constructor, for a template see NativeFileSessionHandler or use handlers in composer package drak/native-session
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