stop inserting data in the database when refreshing the page

Question

I am looking for a way to stop inserting or sending data in the database when refreshing the page.

here is my code:

user_details_page.php

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Answer 1

We can stop it without redirect , best way to use PHP $_SESSION like this :

if($_SERVER['REQUEST_METHOD'] == 'POST' && empty($_SESSION['form_submit']) )
{ 
    extract($_POST);
    $sql=""INSERT INTO table (username, useremail, email) VALUES('$username','$useremail','$email')";
    $_SESSION['form_submit']='true'; 
} 
else
 {
    $_SESSION['form_submit']='NULL';
 }