- You would use it to stop a user from clicking the back button if they decide not to view as a result of a click. //Maybe
- You would use this function if you have some important processing to do and you do not want to stop it, even if your users click Cancel.
- You would use this function if you wanted to abort the script for all logged-in users, not just the one who disconnected.
- You would use this function if you want a PHP script to run forever.
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