All we know that session can store some infomations on server, a conversation between client and server. But there will slow down the server profermance if server have many requests. So we need another way to handle the session store with session_set_save_handler.

####handleWithMysql.php
This file will introduce how to handle session store by mysql

As we know we can use the mysql engine 'memory' will be better if the server have sufficient memory.

CREATE TABLE 'sessions' ( 'sid' CHAR(40) NOT NULL COMMENT 'session name',
'data' VARCHAR(200) NOT NULL COMMENT 'value of seesion',
'update' INT(10) UNSINGED NOT NULL DEFAULT '0' COMMENT 'update time',
UNIQUE INDEX 'sid' ('sid'))
COLLATE='utf8_general_ci'
ENGINE=MEMORY
ROW_FORMAT=DEFAULT

####handleWithRedis.php This file will introduce how to handle session store by redis