Problem bei php Dateien in Unicode

[Anton]

Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at D:\ona_utf\pages\shop_overview.php:1) in D:\ona_utf\pages\shop_overview.php on line 2

Datei shop_overview.php fängt so an:

<?php
session_start();

Warning: Cannot modify header information - headers already sent by (output started at D:\ona_utf\pages\shop_overview.php:1) in D:\ona_utf\classes\_project\page_ona.class.php on line 37

page_ona.class.php :

Zeile 37: header('Content-Type: text/html; charset=utf-8');

Warning: Cannot modify header information - headers already sent by (output started at D:\ona_utf\pages\shop_overview.php:1) in D:\ona_utf\classes\_project\page_ona.class.php on line 37