Evitare al refresh della pagina la ritrasmissione di un form

[Jakub Lemiszewski]

Salve, nel codice seguente vorrei evitare quando faccio il refresh della pagina che mi faccia la ritrasmissione dei dati ma non so come fare ho provato usando header (location:...) ma nulla. Se avete un'idea da mostrarmi vi ringrazio.

<?php /*************NEWSLETTER FORM******************/
function Newsletter(Database $db, Request $request){
  	$name = "";
	$email = "";
	$msg_to_user = "";	
	if (isset($_POST['name'])) {
    $name = $_POST['name'];
	$email = $_POST['email'];
	$sql = "SELECT * FROM newsletter WHERE email='$email'";
	$result = $db->getData($sql);
	$numRows =0;
	foreach ($result as $row){
		$numRows++; 
	}
	
	//echo "num ".$numRows." ....";
	if (!$email) {
		
		$msg_to_user = "<br /><br /><h4><font color='FF0000'>Please type an email address '$name'</font></h4>";
	
	} else if ( $numRows > 0) {
		
		$msg_to_user = "<br /><br /><h4><font color='FF0000'>'$email' is already in the system.</font></h4>";
		
	} else {
		
		$sql = "INSERT INTO newsletter (name, email, dateTime) VALUES('$name','$email',now())";
		$db->query($sql);// !!!!!!IMPORTANT FOR RUN THE SQL!!!!!!!!!!!!!!!!
		//echo mysql_error();
		$msg_to_user = "<br /><br /><h4><font color='0066FF'>Thanks '$name', you have been added successfully.</font></	h4>";
		$name = "";
        $email = "";
	}
}

	$out  ="<section class='subscribe'>";
    $out .="<form action='index.php?page=home&amp;newsletterState=submitted' method='post' class='subscribe-form'>";
    $out .="<fieldset class='letter'>";
    $out .="<legend>Newsletter</legend>";
    $out .="<input type='name' name='name' class='subscribe-name' placeholder='Name' autofocus>";
    $out .="<input type='email' name='email' class='subscribe-email' placeholder='Email address' autofocus>";         
    $out .="<button type='submit' class='subscribe-submit'>Subscribe</button>";
    $out .= "$msg_to_user";
    $out .="</fieldset>";
    $out .="</form>";
	$out .="</section>";
	//include_once("views/letter.php");
	//$out .= letter($db, $request);
	
	return $out;
	
}
Function SendLetter(Database $db, Request $request){	
$subscribeState = $request->get("newsletterState");

if ($subscribeState === "submitted") {
		include_once("views/letter.php");
		$out = letter($db, $request);
		//$url ="index.php?page=home";
		header("location: index.php?page=home&amp;newsletterState=submitted");	
		}else{
			$out = Newsletter($db, $request);
		}
	return $out;
	}

 

[Salvo Salvi]

se ho capito bene quello che vuoi fare devi fare così

form.php (contiene la parte del form e reindirizza il form a script/readForm.php)
script/readForm.php(contiene il codice per interpretare il form)