On Windows, make sure the extension_dir = "ext" line in php.ini is uncommented and pointing to the correct extensions directory if different from "ext".
The SQLite3 extension is enabled by default as of PHP 5.3.0. It's possible to disable it by using --without-sqlite3 at compile time.
Windows users must enable php_sqlite3.dll in order to use this extension. This DLL is included with Windows distributions of PHP as of PHP 5.3.0.
Note:
This extension was briefly a PECL extension but that version is only recommended for experimental use.
On Windows, make sure the extension_dir = "ext" line in php.ini is uncommented and pointing to the correct extensions directory if different from "ext".
On CentOS 6.4 many libraries are not activated... SQLite is one of them.