Dynamic extension loading errors when trying to run the samples

You likely have not enabled dynamically loaded extensions.

Navigate to your php.ini files, find the flag enable_dl and make sure enable_dl = On.

Note that some versions of PHP have two or more copies of php.ini.

For example with PHP 7.2:

/etc/php/7.2/cli/php.ini
/etc/php/7.2/apache2/php.ini