autoload.php

class FileNotFoundException extends Exception{}

function __autoload($ClassName) {
    $classPath = join(DIRECTORY_SEPARATOR, explode('\\', trim($ClassName,'\\')));
    $extentions = explode(',', spl_autoload_extensions());

    $includePaths = explode(PATH_SEPARATOR, get_include_path());

    foreach($includePaths as $key=>$path) {
        $includePaths[$key] = rtrim($path, DIRECTORY_SEPARATOR);
    }

    foreach ($includePaths as $path) {
        foreach ($extentions as $ext):
            $file = $path.DIRECTORY_SEPARATOR.$classPath.$ext;
//          echo "Trying $file . . .\n";
            if (is_file($file)) {
//              echo "Found $file . . .\n\n";
                require $file;
                return;
            }
        endforeach;
    }

    throw new FileNotFoundException("Couldn't find $classPath using extentions: (". join('|', $extentions).').');
}
spl_autoload_extensions('.class.php,.php,.inc');
spl_autoload_register('__autoload', true);