Wordpress and PHP 8.0

[TIKTIK]

Hello,

I`m using WordPress last version with PHP 7.4.
I`m getting a fatal error every time I`m trying to upgrade to PHP 8.0.

Fatal error: Uncaught Error: Call to undefined function putenv() in /www/wwwroot/mydomain/wp-content/plugins/woocommerce/includes/class-wc-regenerate-images-request.php:37 Stack trace: #0 /www/wwwroot/mydomain/wp-content/plugins/woocommerce/includes/class-wc-regenerate-images.php(49): WC_Regenerate_Images_Request->__construct() #1 /www/wwwroot/mydomain/wp-includes/class-wp-hook.php(307): WC_Regenerate_Images::init() #2 /www/wwwroot/mydomain/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters() #3 /www/wwwroot/mydomain/wp-includes/plugin.php(476): WP_Hook->do_action() #4 /www/wwwroot/mydomain/wp-settings.php(598): do_action() #5 /www/wwwroot/mydomain/wp-config.php(95): require_once('...') #6 /www/wwwroot/mydomain/wp-load.php(50): require_once('...') #7 /www/wwwroot/mydomain/wp-blog-header.php(13): require_once('...') #8 /www/wwwroot/mydomain/index.php(17): require('...') #9 {main} thrown in /www/wwwroot/mydomain/wp-content/plugins/woocommerce/includes/class-wc-regenerate-images-request.php on line 37
There has been a critical error on your website.

Any one know how to solve it?

 

[Groot]

Stay with 7.4 or try to disable error display on PHP 8.

 

[Lakuma]

Stay with 7.4 or try to disable error display on PHP 8.

You can. However, PHP 7.4 will only receive security updates until 28 Nov 2022. Then you run the risk of being vulnerable to security risks.

It would be better to resolve the root cause.

I would put your site in maintenance mode while troubleshooting with the following:

Try disabling all your plugins and enabling each one to see if any of them are causing the fatal issue.

It might also be your theme that is not compatible with 8.0.

You might also want to look at the backend log files to see additional output other than what you're seeing on the front end.

 

[MrF2br1]

check your php.ini if putenv function is disabled

 

[Groot]

There many the same problems on net, you can find out and try yourself, but I see some cases:
You not use latest stable PHP 8 version, check server info in Site Health to see this. Update to stable which Woo support (8.1.3, avoid 8.0).
Or
The same case & solution:

WooCommerce php 8.1 + WordPress 5.7.2

I have an issue with using new PHP 8.1 on WordPress 5.7.2. Everything work just fine, until turn on WooCommerce 5.3.0. Then whole site fall down. Here is error message what I'm getting: Fatal error:

stackoverflow.com

It not like problems from theme or plugin when we look above errors.

 

[Groot]

check your php.ini if putenv function is disabled

Yep, if see it, remove it from blacklist.

 

[TIKTIK]

check your php.ini if putenv function is disabled

its not

 

[TIKTIK]

PROBLEM SOLVED.
I removed putenv function from the blacklist, and I still got the error.
But, it stopped after I restart the PHP service on my server.
THANK YOU ALL

 

[Groot]

PROBLEM SOLVED.
I removed putenv function from the blacklist, and I still got the error.
But, it stopped after I restart the PHP service on my server.
THANK YOU ALL

Right, you should restart anytime server rules change.