$file = fopen($dir . '/' . $file_to_write,"w");

$template_content = '
$sql_data_element =  "UPDATE artister SET data_one="'$data_one'" WHERE username= '' . $username. ''";
'; // END OF HTML

fwrite($file, $template_content);

fclose($file);

$sql_data_element =  "UPDATE artister SET data_one='$data_one' WHERE username='new user' ";