PDO is extension that aims to provide a common API to access different types of databases.
The original PDO extension requires PHP 5. However, PHP 5 is currently only being used in about 4% of the PHP hosts, against about 95% that still use PHP 4.
This package provides an API compatible with PDO but it works in PHP 4. It makes possible using PDO by developers that use only PHP 4, without having to upgrade their PHP hosts.
This package implements the PDO database abstraction interface that is compatible with PHP 4.
PDO is an extension introduced in PHP 5 that provides a common interface to several types of relational databases.
Since PDO only became standard extension with PHP 5.1 and very few hosting companies provide PHP 5.1 servers, the idea of this package is to provide an implementation of the PDO API that works under PHP 4 without special extension in a compatible way to the PHP 5 extension.