patchouli/startup.php

<?php
namespace Patchouli;

define('PAT_STARTUP',   microtime(true));
define('PAT_ROOT',      __DIR__);
define('PAT_DEBUG',     is_file(PAT_ROOT . '/.debug'));
define('PAT_PUB',       PAT_ROOT . '/public');  // WWW visible
define('PAT_SRC',       PAT_ROOT . '/src');     // Patchouli namespace
define('PAT_LIB',       PAT_ROOT . '/lib');     // Other unresolved namespaces

ini_set('display_errors', PAT_DEBUG ? 'on' : 'off');
error_reporting(PAT_DEBUG ? -1 : 0);

mb_internal_encoding('utf-8');

set_include_path(PAT_SRC . PATH_SEPARATOR . PAT_LIB . PATH_SEPARATOR . get_include_path());
spl_autoload_register(function(string $className) {
    $parts = explode('\\', trim($className, '\\'), 2);
    if($parts[0] === __NAMESPACE__)
        require_once PAT_SRC . DIRECTORY_SEPARATOR . str_replace('\\', DIRECTORY_SEPARATOR, $parts[1]) . '.php';
    else
        require_once PAT_LIB . DIRECTORY_SEPARATOR . str_replace('\\', DIRECTORY_SEPARATOR, $className) . '.php';
});