PDO Installation is very easy as PDO and the PDO_SQLITE driver is enabled by default as of PHP 5.1.0. we may need to enable the PDO driver for your database of choice;
Windows users
PDO and all the major drivers ship with PHP as shared extensions, and simply need to be activated by editing the php.ini file:
extension=php_pdo.dll
extension=php_pdo_mysql.dll extension=php_pdo_oci.dll extension=php_pdo_oci8.dll extension=php_pdo_odbc.dll extension=php_pdo_pgsql.dll
but This step is not necessary for PHP 5.3 and above, as a DLL is no longer required for PDO.