php: environment dependent config autoloading Yii startup

index.php

<?php
define("APP_DIR", dirname(dirname(__FILE__)));
define("WWW_DIR", dirname(APP_DIR));
define("CONF_DIR", APP_DIR . "/protected/config/");

$clusters = require_once(CONF_DIR . "clusters.php");
$mainConfig = require_once(CONF_DIR . "main.php");

// 根据应用程序所在环境加载配置, 默认为develop
if (isset($clusters["product"]) && in_array(strtolower(php_uname("n")), $clusters["product"])) {
	defined("YII_DEBUG") || define("YII_DEBUG", false);
	defined("YII_TRACE_LEVEL") or define("YII_TRACE_LEVEL", 0);
	$clusterConfig = require_once(CONF_DIR . "conf.d/product.php");
} else {
	defined("YII_DEBUG") || define("YII_DEBUG", true);
	defined("YII_TRACE_LEVEL") or define("YII_TRACE_LEVEL", 3);
	$clusterConfig = require_once(CONF_DIR . "conf.d/develop.php");
}

require_once (WWW_DIR . "/thirdlib/yii/framework/yii.php");

Yii::setPathOfAlias("jike", WWW_DIR . "/jikelib");			//jike namespace
Yii::setPathOfAlias("third", WWW_DIR . "/thirdlib");		//third namespace
Yii::import("jike.yiiext.*");								//import jike.yiiext
Yii::import("third.*");										//import third

$GLOBALS ["THRIFT_ROOT"] = APP_DIR . "/protected/lib/thrift/";

// Run Application
$config = CMap::mergeArray($mainConfig, $clusterConfig);
Yii::createWebApplication($config)->run();