Saving File into a dir

[renj0806]

I currently have

 

<?php
$getPageContent = $_POST['codeArea'];
$getFfilename = $_POST['filename'];
$createfileName = $getFfilename.".php"; 
$save = fopen($createfileName, "a+");
fwrite($save, stripslashes($getPageContent));
fclose($save);
?>

 

How can i improve this script so that I can save this file to a dir? For example, i would like to save it in a User dir.