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prevent user from accessing page


barrowvian

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I've recently decided to use paypal standard on my site and to implement the return function so that the user goes back to my site. When the user is redirected I use php to perform some checks (like the code provided on paypal) and then move on with a bit of post paypal processing (taking some extra details and images from the user, which is then emailed to me). However, I have a small problem.....once the user submits the required details on my site they can simply press the back button and then start again, effectively allowing them to submit multiple entries when I only want to allow them to do it once. Is there anyway to prevent them from doing this? I dont want to create a login system though as its not needed.

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https://forums.phpfreaks.com/topic/201962-prevent-user-from-accessing-page/
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