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Note that you cannot perform any database functions using
the PDO extension by itself; you must install a database-specific
PDO driver like

 * databases/pecl-PDO_MYSQL
 * databases/pecl-PDO_PGSQL
 * databases/pecl-PDO_SQLITE
 * databases/pecl-PDO_ODBC
 * databases/pecl-PDO_DBLIB
 * databases/pecl-PDO_OCI

to access a database server.

And you should uninstall and re-install your individual database drivers
whenever you upgrade the base PDO package, otherwise you will see an
error about PDO API numbers when you run your PHP scripts.

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