This is an enigmatical matter.
I’m sure my php settings is true. In my “phpinfo.php” showing as below:
PDO
PDO support enabled
PDO drivers sqlite, mssql, mysql, odbc, sqlite2
pdo_mysql
PDO Driver for MySQL, client library version 5.0.51a
But when I installing Piwik on step “systemCheck”, Page showing as below:
PDO extension √
Piwik requires either the mysqli extension or both the PDO and pdo_mysql extensions.
On a Windows server you can add the following lines to your php.ini:
extension=php_mysqli.dll
extension=php_pdo.dll
extension=php_pdo_mysql.dll
More information on: PHP PDO and MYSQLI.