You are reading this article because you are seeing a message on your website: Your PHP installation appears to be missing the MySQL extension which is required by WordPress
The error message "Your PHP installation appears to be missing the MySQL extension which is required by WordPress" can appear when you are using a PHP version which is incompatible with your scripts version.
Meaning your WordPress installation is most likely outdated.
Since the 'MySQL' extension is deprecated (no longer supported) from PHP 7.0 and beyond, changing your PHP version to 5.6 or lower will fix the issue.
This can be done inside of Cpanel by accessing the "MultiPHP Manager".
However, the best solution would be to update your WordPress installation.
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