PHP refresh pops up a pop-up box to resubmit the form

Problem: On the PHP form page, the form has been submitted, and the pop-up box for resubmitting the form will continue to pop up after refreshing. If I click Continue, there will be two duplicate records in the database.

Solution: After

post, manually add the refresh code, as follows:

echo "<script>location.reload()</script>";

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