make sure you enable the pdo extensions in your php.ini file. to enable this extension, start wamp, then use the wamp tray icon menu and to to:
php settings -> php extensions (located at the very bottom of the list) and enalbe php_pdo_mysql and if you want to use pdo with sqlite, then also enable php_pdo_sqlite.
after you change each setting, wamp will automatically restart apache for your new settings to take effect. then open up your phpinfo and pdo should be there.
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