PHP会话与Cookie [重复]

Question

Possible Duplicate:
Cookie VS Session
PHP: How do Cookies and Sessions work?

I'm trying to learn PHP. I have a project website where numbers are constantly being generated, and changed and stored in javascript variables. There is very little php involved except in storing these variables to a database when the user hits the "store to database" button. Today I was using the site, navigated to another website and went back and all my data was gone as i had not stored it to the database first. I would like to save that data so it repopulates if I leave the page. what would be the best method of doing this? php sessions, cookies, or javascript cookies? please advise, thanks in advance!

Answer 1

php sessions, cookies, or javascript cookies?

There is either a session or cookie so there are two things not three.

Now a session is also a cookie but is saved on server unlike simple JS cookie which is saved in user's machine.

I would like to save that data so it repopulates if I leave the page

If it is sensitive information, always use database to store it and if it is not sensitive data:

• Use cookies or localStorage but it can be deleted by user
• Use session which can't be deleted by a user but will expire based on php.ini settings

On the other hand, to save it permanently, use the database instead.