remove information from mysql table when user close his Browser

i m creating t开发者_Go百科wo table(in mysql) named

1. table_temp_guest
2. table_temp_order

now if a guest enters then we save his personal information in this first table and if he purchase something from any stall ,it saved as a temporary order in table_temp_order.

now my question is :

i m using session id, so when user goes to logout( without checkout) then i delete his information(personal and order) from both table )using session id, BUT if he close the browser, or does not go to checkout(any reson) then how to delete his information from both tables please suggest me how to do this?

additional question: is there any other way to do this whole process by some other manner.

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You can't detect when a user closes the browser or types in a new address. You basically need to have a "timeout" facility like the rest of the websites have.

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There is a window.onunload event that you can detect with javascript, but it's not universally supported, and it detects window closes, not browser closes.

Your best resolution is probably going to be tracking the session_id and last accessed date. Re-update the table's last_accessed_date on every page load, and delete everything that's older than a few hours.

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A timeout would be the best method.

Record the last active time in the guest table. Have a cron job running periodically on the web server cleaning up sessions that exceed the maximum time that you wish to allow.

Be careful about the amount of time that you allow. You have to allow for slow users and dropped connections.

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If you're using session_id() anyway (I guess this is what you mean by session id), just use php sessions. PHP automatically invalidates them for you and you don't need those two tables (you can store everything you need in $_SESSION).

There is no way to check if the broswer wasn't closed you could rely on.

If you don't want to change the way your project works now, just add a created field to the tables and set it to the current time() whenever you're "seeing" the specific user. Then set up a cronjob which deletes all records from this table which are older than a specific timeout.

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Also you can try to have a script that would run on the client side and ping the server so that you know if the script has not pinged for a while, the user closed the browser. That being said, I would agree with the previous posters, a timeout/ cleanup procedure would be best.

For that you would add a ModifiedDate field to your tables, you can set it as an "ON UPDATE" field for ease of use, then just delete all records that have an ModifiedDate field of older then several hours.