Kod :
if (isset($_POST['rtutarpost'])) {
$rtutar = trim(filter_input(INPUT_POST, 'rtutar', FILTER_SANITIZE_STRING));
$refurl = "https://SANSÜR/test.php?tutar=".$rtutar."";
header('Location: '.$refurl);
die();
}*sansürü ben koydum şimdi* 13
●131
if (isset($_POST['rtutarpost'])) {
$rtutar = trim(filter_input(INPUT_POST, 'rtutar', FILTER_SANITIZE_STRING));
$refurl = "https://SANSÜR/test.php?tutar=".$rtutar."";
header('Location: '.$refurl);
die();
}*sansürü ben koydum şimdi* 
<?php
if (isset($_POST['rtutarpost'])) {
$rtutar = trim(filter_input(INPUT_POST, 'rtutar', FILTER_SANITIZE_STRING));
$refurl = "https://SANSÜR/test.php?tutar=".$rtutar."";
header('Location: '.$refurl);
die();
}
?>
<form action="" method="post">
<input name="rtutar" type="text" class="form-control" placeholder="Tutarı Giriniz" max="10000" min="1">
<button name="rtutarpost" class="btn btn-success btn-round">Devam</button>
</form>