UniversalClassLoader implements a "universal" autoloader for PHP 5.3. It is able to load classes that use either:

• The technical interoperability standards for PHP 5.3 namespaces and class names.
• The PEAR naming convention for classes.

Classes from a sub-namespace or a sub-hierarchy of PEAR classes can be looked for in a list of locations to ease the vendoring of a sub-set of classes for large projects.

Example usage:

$loader = new UniversalClassLoader();

// register classes with namespaces
$loader->registerNamespaces(array(
    'Symfony\Component' => __DIR__.'/component',
    'Symfony' => __DIR__.'/framework',
));

// register a library using the PEAR naming convention
$loader->registerPrefixes(array(
    'Swift_' => __DIR__.'/Swift',
));

// activate the autoloader
$loader->register();

In this example, if you try to use a class in the Symfony\Component namespace or one of its children (Symfony\Component\Console for instance), the autoloader will first look for the class under the component/ directory, and it will then fallback to the framework/ directory if not found before giving up.

###Credits This UniversalClassLoader is a copy of The Symfony2 UniversalClassLoader. It's made & opensourced by Fabien Potencier of Sensio Labs for the Symfony2 Framework, the original can be found on the Symfony2 github page.