Installation

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.