# SQLite Functions (PDO_SQLITE)

## Introduction

PDO_SQLITE is a driver that implements the PHP Data Objects (PDO) interface to enable access to SQLite 3 databases.

In PHP 5.1, the SQLite extension also provides a driver for SQLite 2 databases; while it is not technically a part of the PDO_SQLITE driver, it behaves similarly, so it is documented alongside it. The SQLite 2 driver for PDO is provided primarily to make it easier to import legacy sqlite 2 database files into an application that uses the faster, more efficient sqlite 3 driver. As a result, the SQLite 2 driver is not as feature-rich as the SQLite 3 driver.

## Table of Contents

- PDO_SQLITE DSN — Connecting to SQLite databases
- PDO->sqliteCreateAggregate() — Registers an aggregating User Defined Function for use in SQL statements
- PDO->sqliteCreateFunction() — Registers a User Defined Function for use in SQL statements