I'm hooking auth_redirect to wp_head, but it's returning cannot modify header information. Do I have to hook it to a different action? Something that loads before wp_head? I tried hooking it to get_headers and send_headers, but then it didn't even work.

Any ideas? Thanks!


function check_if_logged_in() {
  $pageid = get_option('sd_page_id');
  if ( !is_user_logged_in() && is_page($pageid) ) {

Also, to clarify, for some reason it works in localhost but not on my server. Weird.

  • Could you post the exact function that you are using to hook auth_redirect? Sep 12, 2012 at 4:15
  • Ok added code in my original post
    – zen
    Sep 12, 2012 at 21:53

1 Answer 1


It works fine on my localhost as well.

The reason it probably doesn't work on your server is that it's not using output buffering. Hooking into wp_head means that the page has already started printing to the client's screen. Meaning auth_redirect's use of wp_redirect will fail: the headers have already been sent and you see the "headers already sent" error.

Try hooking into template_redirect instead of wp_head. I wouldn't use auth_redirect here either. You're already checking if the user is logged in (which auth_redirect does as well). Simply sent users to the login page with an appropriate "redirect_to" argument if they aren't logged in.

function wpse64899_check_if_logged_in()
    $pageid = 2; // or whatever you want it to be
    if(!is_user_logged_in() && is_page($pageid))
        $url = add_query_arg(
  • Aha! That solved it. Is there a reason why you wouldn't use auth_redirect though? Just curious. Thanks!
    – zen
    Sep 12, 2012 at 22:57
  • 1
    auth_redirect does the user logged in checking for you as well. If you're going to use it, there's no need to check of the user is logged in first. if(is_page($your_page)) { auth_redirect(); } It's also a pluggable function. Sep 12, 2012 at 23:24
  • Oh ok I see. Got it!
    – zen
    Sep 13, 2012 at 0:03
  • @chrisguitarguy thanks a lot for the explanation. Just learned the template_redirect thing in WordPress, and learned why wp_redirect() was showing "headers already sent". Thanks a lot for the explanation. Apr 16, 2015 at 5:26

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