Lightweight, PSR-0 compliant SPL Autoloader

spl_autoload.php

<?php

$paths = array
(
	__DIR__ . '/vendor/',
	__DIR__ . '/vendor/phunction/phunction.php',
);

foreach ($paths as $path)
{
	if (is_dir($path) === true)
	{
		spl_autoload_register(function ($class) use ($path)
		{
			if (($namespace = strrpos($class = ltrim($class, '\\'), '\\')) !== false)
			{
				$path .= strtr(substr($class, 0, ++$namespace), '\\', '/');
			}

			require($path . strtr(substr($class, $namespace), '_', '/') . '.php');
		});
	}

	else if (is_file($path) === true)
	{
		require($path);
	}
}