Symptoms
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Administrator receives mail notifications with the following content:
Instance "My CMS" (http://example.com/wordpress): PHP Warning: PHP Startup: Unable to load dynamic library '/opt/plesk/php/5.6/lib64/php/modules/mysqli.so' - /opt/plesk/php/5.6/lib64/php/modules/mysqli.so: undefined symbol: mysqlnd_connect in Unknown on line 0
PHP Warning: Module 'mysqlnd' already loaded in Unknown on line 0
PHP Warning: Module 'json' already loaded in Unknown on line 0
PHP Warning: Module 'Phar' already loaded in Unknown on line 0 -
The following warnings received when updating the plugins/themes at WP Toolkit under [Websites &] Domains > example.com > WordPress > Updates:
PHP Warning: PHP Startup: Unable to load dynamic library 'mysqli.so' (tried: /opt/plesk/php/7.4/lib64/php/modules/mysqli.so (/opt/plesk/php/7.4/lib64/php/modules/mysqli.so: undefined symbol: mysqlnd_global_stats), /opt/plesk/php/7.4/lib64/php/modules/mysqli.so.so (/opt/plesk/php/7.4/lib64/php/modules/mysqli.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
Cause
Incorrect configuration for PHP: extensions mentioned in the error messages are directly compiled into the PHP binary. When present in /opt/plesk/php/X.X/etc/php.ini file, they are also loaded even though they are already compiled into the PHP binary.
Resolution
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Connect to the server via SSH.
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Open the
php.inifile in the working folder of PHP version used on the domain:/opt/plesk/php/X.X/etc/php.ini, where X.X is the PHP version.
For example, if the warning mentions/opt/plesk/php/7.4/lib64/php/modules/mysqli.so, the file is/opt/plesk/php/7.4/etc/php.ini. -
Comment out (put
;symbol at the beginning of) the lines with extensions mentioned in the error messages like follows:; extension=mysqli.so
; extension=mysqlnd.so
; extension=json.so
; extension=phar.so
with