My header is loaded with every page (include). So I start the session and check for a running session when the header is loaded again.
if(session_status() == 1){ // 1 = none
session_name('vitisynth_sess');
session_start();
}
I open the index.php page, everything is OK. I open the next page and get:
Warning: session_name(): Cannot change session name when headers already sent in /www/htdocs/v080275/development/vitisynth/header.php on line 3
Asking for an existing session seems to be completely superfluous.