Not really sure what your trying to achieve, but I'll try to answer based on what you've shown here.
One option is that you could use record locking in your database and then use php to check if the record is locked due to concurrent users and send to an error/alternate page.
Another option is that you may have to play around with sessions/cookies and there is plenty of example code for this via Google search.
I'll have a peek and see what I can dig up for you.
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