WordPress site has error after upgrading to PHP 8.2

Question

I tried to update the PHP of my site on WHM from PHP 7.4 to PHP 8.2.

But before updating I make sure that themes, plugins, and core WordPress are up to date.

After upgrading to PHP 8.2 I've got this error.

    Fatal error: Uncaught TypeError: call_user_func_array():
    Argument #1 ($callback) must be a valid callback, 
    non-static method wp_meta_robots_plugin::meta_robots_addcolumn() 
    cannot be called statically in 
     /home/fixmywri/public_html/wp-includes/class-wp-hook.php:310 
Stack trace: #0 /home/fixmywri/public_html/wp-includes/class-wp-hook.php(334): WP_Hook->apply_filters(NULL, Array)
 #1 /home/fixmywri/public_html/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
 #2 /home/fixmywri/public_html/wp-settings.php(632): do_action('init')
 #3 /home/fixmywri/public_html/wp-config.php(90): require_once('/home/fixmywri/...')
 #4 /home/fixmywri/public_html/wp-load.php(50): require_once('/home/fixmywri/...')
 #5 /home/fixmywri/public_html/wp-blog-header.php(13): require_once('/home/fixmywri/...')
 #6 /home/fixmywri/public_html/index.php(17): require('/home/fixmywri/...')
 #7 {main} thrown in /home/fixmywri/public_html/wp-includes/class-wp-hook.php on line 310

I am using the Twenty Twenty theme. I tried to switch to a different theme, but the error still persists.

What could be the problem with this?

O. Jones · Accepted Answer · 2023-09-23 13:36:08Z

Your site contains a plugin called WordPress Meta Robots that hasn't been cleaned up to comply with recent versions of php. The php developers are cleaning up the language to make it more secure, and they've prevented certain operations like the one that caused your error.

How do I know this? I looked at the first couple of lines of your error message where it says

Fatal error: Uncaught TypeError: call_user_func_array():
    Argument #1 ($callback) must be a valid callback, 
    non-static method wp_meta_robots_plugin::meta_robots_addcolumn() 
    cannot be called statically in 
     /home/fixmywri/public_html/wp-includes/class-wp-hook.php:310

Then I used https://wpdirectory.net/ to search the plugin repo's source code for meta_robots_addcolumn and boom, there it was. A non static method being called as if it were static.

Get rid of the plugin, or get the developer to bring it into compliance, or rollback php to an earlier version, or fix it yourself.

Jason Olson · Accepted Answer · 2023-09-23 04:30:23Z

0

Currently Wordpress only fully supports PHP 7.4, and it only supports with exceptions PHP 8.0 & 8.1; and PHP 8.2 is only in BETA (ie not fully supported for production).

Your error: it leads me to believe that you haven't updated to Wordpress 6.3 yet -- which you should do before updating PHP. Fortunately, the latest version of Wordpress 6.3.1 fully supports PHP 7.4 -- start with the detailed Upgrading WordPress Docuemnation -- as part of that process you'll also go through and update your plug ins.

After that, then you'll look to upgrade your PHP from 7.4 to 8.2 -- but be prepared it is possible your plugins might not support PHP 8.2.

P.S. Your theme should work fine with 8.2 as I have that running on a test website running on PHP 8.2 -- and the error does not suggest that this is a plugin issue.

answered Sep 23, 2023 at 4:30

Jason Olson

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2 Comments

Len Over a year ago

Hi thanks for your answer, but I believe I have the latest version of WordPress before upgrading the PHP. Current version: 6.3.1 Last checked on September 22, 2023 at 8:38 pm GMT-0800. And it's weird, I have another WP site and it is already in PHP 8.2 and it is working with no problem at all.

Jason Olson Over a year ago

Perhaps try disabling all plug ins and see what you get. Also maybe review the upgrade docs to see if you skipped over any steps.

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