Headers already sent – WordPress core

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I’m getting an error on my site regarding “headers already sent”:

Warning: Cannot modify header information – headers already sent by (output started at ………/wp-admin/menu-header.php:161) in ……/wp-includes/pluggable.php on line 881

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I read the WordPress FAQ that discusses this, but – as you can see – this error is caused by the WordPress core (and not even at the end of a file).

Interestingly, I don’t get this error on my local machine. Only on my server.

What can I do about this?

I’m running WordPress 3.4.2

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1 comment

  1. WordPress provides a way to prevent the header HTML from being rendered, by appending &noheader=true to the url.

    That will cause the header HTML to wait for you to call it manually, so that you can do a redirect before that.

    To later render the header HTML from your page, you’ll have to use this:

    if ( isset($_GET['noheader']) ) {
    require_once(ABSPATH . 'wp-admin/admin-header.php');
}

    For more information, read this article: WordPress and wp_redirect() function problem.