This excerpt from PHP and MySQL Web Development outlines a key step in object-oriented PHP.

Built-in Classes Every OOP language comes with some built-in classes, and PHP is no exception. PHP 5 introduces the Standard PHP Library (SPL), which provides a number of ready-made classes and ...

I'll demonstrate how easy it is to use the PEAR::Image_Barcode class in PHP to dynamically create barcodes for your Web applications.