session无法传递，files保存可以，mysql保存却无法传递
将验证码保存在session，当用files来保存session的时候，用户注册的时候能在后台$_SESSION['captcha']读取到这个验证码，也就是说能正常传递，但是改为用mysql来保存session的时候，能正常储存session（在数据库里能看到有captcha的session值），在生成验证码的那个页面用$_SESSION['captcha']也是能读到那个值的，但是之后用户注册后台另一个页面却读取不到这个值，（也就是说不能传递了），很久之前都是可以的，现在发现居然不行了，有没有谁能想到是什么原因？
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