1. copy $php/php5ts.dll and libmysql.dll into $windows/system32
2. in php.ini
#find extension=php_mysql.dll and add a new line:
extension=php_mysqli.dll
A detail step by step link:
1. copy $php/php5ts.dll and libmysql.dll into $windows/system32
2. in php.ini
#find extension=php_mysql.dll and add a new line:
extension=php_mysqli.dll
A detail step by step link: