autoload.php
Autoloads files for PHP_CodeSniffer and tracks what has been loaded.
Due to different namespaces being used for custom coding standards, the autoloader keeps track of what class is loaded after a file is included, even if the file is ultimately included by another autoloader (such as composer).
This allows PHP_CodeSniffer to request the class name after loading a class when it only knows the filename, without having to parse the file to find it.