Automap is a fast map-based PHP autoloader.

Unlike path-based autoloaders, map-based autoloaders locate required PHP scripts using symbol maps. These maps are created offline by a program (included) which scans script files and extracts the symbols they define. At runtime, map files are loaded when the application starts and are then used to resolve undefined symbols and load the corresponding PHP script files.

As a complement to the base Automap software, an optional PECL extension acts as an accelerator, making Automap probably the fastest PHP autoloader available today.

For an introduction and a list of features, please start here.