What happened to php_mysql.dll?

Thanks to the comment of Naruto I figured out that the dynamic loading of all the modules in the php\ext folder wasn't the culprit. Because the file php_mysql.dll wasn't in that folder, so it couldn't be loaded from there. After further analyses it seems that in the latest PHP (7.02) download for Windows 64-bit the php.ini file still contains this:

[PHP_MYSQL]
extension=php_mysql.dll

After commenting out the section the error in the log file was gone. As we obviously can't load that dll file anymore.

;[PHP_MYSQL]
;extension=php_mysql.dll

For PHP 7.2 when using PDO for MySQL I had to un-comment the following line:

;extension=pdo_mysql

extension=pdo_mysql

It's worth noting that there are other versions of the PDO extension also commented out:

;extension=pdo_firebird
;extension=pdo_mysql
;extension=pdo_oci
;extension=pdo_odbc
;extension=pdo_pgsql
;extension=pdo_sqlite

mysql extension was deprecated on v5.5 and removed on v7 please check out link below, https://wiki.php.net/rfc/remove_deprecated_functionality_in_php7