AJAX

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>jQuery POST Example</title>
<script type="text/javascript" src="jquery-2.1.4.js"></script>
<script type="text/javascript">
var toUser = "you";
$(document).ready(function(){
    $("#driver").click(function(event){
        $.post("processtext.php", {sometxt:"Hallo ", moretxt:toUser}, function(data){$("#stage").html(data);});
    });
});
</script>
</head>
<body>
<div id="stage">
STAGE
</div>

<button id="driver">Run script</button>
</body>
</html>

<?php
if($_REQUEST["sometxt"]){
    $exampletext = $_REQUEST["sometxt"];
    $secondstring = $_REQUEST["moretxt"];
    echo "The text: ".$exampletext." ".$secondstring;
}
?>