example doctrine bootstrapper

bootstrap.php

<?php
use Doctrine\Common\ClassLoader,
    Doctrine\ORM\Tools\Setup,
    Doctrine\ORM\Mapping\Driver\AnnotationDriver,
    Doctrine\Common\Annotations\AnnotationReader,
    Doctrine\ORM\EntityManager;

// Autoloaders
require_once __DIR__ . '/../lib/doctrine/lib/Doctrine/ORM/Tools/Setup.php';
Doctrine\ORM\Tools\Setup::registerAutoloadGit(__DIR__ . '/../lib/doctrine');
$classLoader = new ClassLoader('Entities', __DIR__);
$classLoader->register();
$classLoader = new ClassLoader('DoctrineProxies', __DIR__);
$classLoader->register();
$classLoader = new ClassLoader('Classes', __DIR__);
$classLoader->register();

// Config
$isDevMode = true; //you want to autogenerate stuff and not use caches. So yes, it is dev mode!
$proxyDir = __DIR__ . DIRECTORY_SEPARATOR . 'DoctrineProxies'; //that's what the Setup tool uses internally
$config = Setup::createConfiguration($isDevMode, $proxyDir);
$paths = array(__DIR__ . DIRECTORY_SEPARATOR . 'Entities'); // paths that are crawled by the annotation metadata driver
$config->setMetadataDriverImpl(new AnnotationDriver(
    new AnnotationReader(),
    $paths
));
$dbParams = array(
    'dbname'   => DB_DATABASE,
    'user'     => DB_USERNAME,
    'password' => DB_PASSWORD,
    'host'     => DB_HOST_URL,
    'driver'   => 'pdo_mysql',
);

return EntityManager::create($dbParams, $config);