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';
 }

Answer 2

Once an insert or update is done in your code you always need to redirect to another page.

See here on how to do that: How to make a redirect in PHP?

(You want to use a PHP redirect, not a Javascript or HTML one, because you obviously really need this to work.)

The confirm page should be what you redirect to after the update, not what does the insert.

Answer 3

The fast way is to redirect the page to it's current location:

if (isset($_POST['submit'])) 
{
//do somthing
header("Location: $current_url");
}

Answer 4

The best way to prevent that is to add header('Location: filename') after your query. Thus in your case,

if (isset($_POST['submit'])) 
{
$user= $_POST['username'];
$email = $_POST['useremail'];
$pass= $_POST['password']; 

mysql_query("INSERT INTO table (username, useremail, email) VALUES ('$username','$useremail','$email');
//must be inside the condition to prevent too many redirects
header('Location: user_details_page.php');
}