[resolved] Cannot modify header information - headers already sent (2 posts)

  1. sfong15
    Posted 9 years ago #

    I have justed installed XAMPP at one PC at home, installed WP2.0.4 there which was super easy. Tried activativing some plugins but a few of them failed having warning as "can't modify header info ....already sent" something like that. When I clicked back button of my FF the plugin was activiated alright.

    What caused that?

    I used to have separate installation of Apache, MySQL and PHP and running WP (earlier versions) on localhost which was OK.

  2. Chris_K
    Posted 9 years ago #

    First off, have a look at the plugin files (the .php) and ensure that there are no spaces or extra lines at the very top or very bottom. In other words, there can't be anything before <?php nor anything after the last ?>

    Secondly, see this link for more info: http://codex.wordpress.org/FAQ_Troubleshooting#How_do_I_solve_the_Headers_already_sent_warning_problem.3F

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