PHP:WARN in Canonical.php

  • Resolved affinityinspiration

    (@affinityinspiration)


    1 year, 8 months ago

    I’m consistently getting this in my logs.

    PHP Warning:  Undefined array key “host” in /Users/robert/www/Chalmers/wp-includes/canonical.php on line 716,727,and 730 and 751. Probably others. Also from time to time “scheme”

    Which is all the places the warning appears. Now I know that this has been around for ages so I’m wondering when it is going to be solved. It’s nothing to do with a plugin, but I think more to do with redirection. Which is usually handled by .htaccess to start with. However…

    Undefined array key usually means just that. The ‘key’ isn’t being defined for some reason.

    Anybody got any current ideas on what’s going on here?

    Thanks

Viewing 3 replies - 1 through 3 (of 3 total)
  • royjemee

    (@royjemee)

    1 year, 8 months ago

    The PHP warning “Undefined array key” typically indicates that your code is attempting to access an index in an array that does not exist. In the context of WordPress, this could happen for a variety of reasons, such as a misconfiguration in the .htaccess file, issues with redirections, or problems with the WordPress core files or plugins.

    Here are some steps to troubleshoot and resolve the issue:

    Check the .htaccess File:
    Ensure that the .htaccess file is correctly configured. Incorrect rewrite rules or missing directives can cause redirection issues that lead to undefined array keys. You can use the basic .htaccess file and try – https://developer.wordpress.org/advanced-administration/server/web-server/httpd/

    WordPress Core Files:
    Also, it’s possible that something went wrong during an update or that files have been corrupted. To address this –

    • Go to the WordPress Dashboard -> Updates and click on “Re-Install Now” to ensure you have the latest version of WordPress¹.
    • If the issue persists, manually download the latest WordPress package and replace the wp-includes and wp-admin directories via FTP.

    Theme and Plugins:

      • Temporarily switch to the default WordPress theme to rule out any theme-related issues.
      • Deactivate all plugins and reactivate them one by one to identify if a specific plugin is causing the issue¹.

      PHP Version:
      The warning may also be related to the PHP version you are using. If you recently upgraded to PHP 8.x, some older code might not be fully compatible. Switch to a different PHP version for testing.

      These all debugging ideas came to my mind now. Wish you good luck with testing.

      Thread Starter affinityinspiration

      (@affinityinspiration)

      1 year, 8 months ago

      Thanks,

      But none of these options fixed the issue. I’m running

      Current version: 6.5.4
      Last checked on June 12, 2024 at 9:58 am GMT+0000.

      The .htaccess file is good. All pages work fine. In fact everything works fine. Except I’m seeing the PHP Warn notices in the error_log

      Can’t find anything wrong?

      Moderator threadi

      (@threadi)

      1 year, 8 months ago

      This is a known bug that apparently only occurs in a few constellations. See: https://core.trac.wordpress.org/ticket/34353 – I would recommend that you join the ticket and describe your environment as precisely as possible so that it can be recreated and solved.

    Viewing 3 replies - 1 through 3 (of 3 total)

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