Form Submission to Database and Redirect in PHP

Suppose we have a form:

<form method="POST">
	<input name="test1">
	<input name="test2">
	<input type="submit">
</form>

Let's save this form's data to the database:

<?php
	if (!empty($_POST)) {
		// save to database
	}
?>

However, there is a problem here: if you refresh the browser page, the form will be submitted and saved again, creating a duplicate data entry.

To solve this problem, you need to perform a redirect to the same page after saving the form:

<?php
	if (!empty($_POST)) {
		// save to database
		
		header('Location: form.php');
		die();
	}
?>

Create a form and implement its saving to the database after submission. Eliminate double saving after submission.