/PHP/How to clear post array on referesh + not refill when return

How to clear post array on referesh + not refill when return

if (!isset($_SESSION)) {
session_start();
}

if ($_SERVER['REQUEST_METHOD'] == 'POST') {
$_SESSION['postdata'] = $_POST;
unset($_POST);
header("Location: ".$_SERVER[REQUEST_URI]);
exit;
}

if (@$_SESSION['postdata']){
$_POST=$_SESSION['postdata'];
unset($_SESSION['postdata']);
}

Source: stackoverflow.com

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