A lot of warnings appear in php-fpm log after updating Plesk: PHP Warning: Zend OPcache can't be temporary enabled

Leo Mastropierro

Updated October 25, 2025 08:00

kb: bug kb: fixed kb: technical Plesk Obsidian for Linux

Applicable to:

After updating Plesk to version 18.0.71.2 many websites are reporting the following warning:

WARNING: [pool example.com] child 933098 said into stderr: "PHP message: PHP Warning: Zend OPcache can't be temporary enabled (it may be only disabled till the end of request) in Unknown on line 0"
The following setting exists in website's php-fpm configuration file:

# grep "opcache.enable" /opt/plesk/php/X.X/etc/php-fpm.d/example.com.conf
php_admin_value[opcache.enable] = 1
Same setting is defined in domain's php.ini file:

# grep "opcache.enable" /var/www/vhosts/system/example.com/etc/php.ini
opcache.enable = 1

Product issue:

#PPPM-15067 "Fixed the issue where âZend OPcache canât be temporary enabledâ errors appeared in the PHP-FPM error logs."
Fixed in:
- Plesk Obsidian 18.0.72 19 August 2025 (Linux)

Please consider updating your server:

If update is not possible for some reason you may try the following

workaround

If the issue persists after updating Plesk to the latest build, the following manual action is required:

Connect to the server via SSH
Temporarily remove the conflicting setting with the following command:

# sed -i '/php_admin_value\[opcache\.enable\] = 1/d' /opt/plesk/php/*/etc/php-fpm.d/*
Restart PHP Handlers:

# systemctl restart plesk-php*-fpm.service
Run plesk repair utility to rebuild configuration files:

# plesk repair web -y