共享数据之间的冲突

Question

This is a common problem about sharing data.

As i am building a system that allow user share their mailing list to their colleague.

I suspect there is a problem when userA open the page , userB open the same page and edit the data, after that user A edit the data and submit and the changes of userB will be cancel.

As i am using PHP , is their any way to prevent this kind of error??? Thank you.|

Are there any coding example provided in php /jquery??? Thanks a lot

Answer 1

Make editions log, so user A will update conent ver. 123 to ver. 124 , user B will try too to update ver. 123 in his own way, but on server there is already ver. 124, so you will show message to user B, that content was recently modified by another user.

This principe is used in SVN for example.