composer/tests/Composer/Test/Autoload/Fixtures/autoload_target_dir.php

<?php

// autoload.php generated by Composer
if (!class_exists('Composer\\Autoload\\ClassLoader', false)) {
    require __DIR__.'/ClassLoader.php';
}

return call_user_func(function() {
    $loader = new \Composer\Autoload\ClassLoader();

    $map = require __DIR__.'/autoload_namespaces.php';
    foreach ($map as $namespace => $path) {
        $loader->add($namespace, $path);
    }

    $classMap = require __DIR__.'/autoload_classmap.php';
    if ($classMap) {
        $loader->addClassMap($classMap);
    }

    spl_autoload_register(function($class) {
        $prefixes = array('Main\\Foo', 'Main\\Bar');
        foreach ($prefixes as $prefix) {
            if (0 !== strpos($class, $prefix)) {
                continue;
            }
            $path = dirname(dirname(__DIR__)) . '/' . implode('/', array_slice(explode('\\', $class), 2)).'.php';
            if (!stream_resolve_include_path($path)) {
                return false;
            }
            require_once $path;
            return true;
        }
    });

    $loader->register();

    return $loader;
});