I'm writing a plugin that includes customized login and register forms. The forms will be integrated in a normal page, the "naked" standard login page of WP must not appear at any time...
Now I've got the problem that of course there's already some HTML output before this line:
$user = wp_signon('', $secure_cookie);
And of course this produces the well known 'headers already sent' error message. As I'm not much used to hooks and filters, I have no idea right now how I can make the wp_signon() function being called before any output has started from within the function inside my plugin php file.
So, what could be a solution for this?