将数据库配置信息转换成配置文件

function update_sys_config()
{
	$filename = APP_ROOT_PATH."public/sys_config.php";
	if(!file_exists($filename))
	{
		//定义DB
		require APP_ROOT_PATH.'system/db/db.php';
		$dbcfg = require APP_ROOT_PATH."public/db_config.php";
		define('DB_PREFIX', $dbcfg['DB_PREFIX']); 
		if(!file_exists(APP_ROOT_PATH.'public/runtime/app/db_caches/'))
			mkdir(APP_ROOT_PATH.'public/runtime/app/db_caches/',0777);
		$pconnect = false;
		$db = new mysql_db($dbcfg['DB_HOST'].":".$dbcfg['DB_PORT'], $dbcfg['DB_USER'],$dbcfg['DB_PWD'],$dbcfg['DB_NAME'],'utf8',$pconnect);
		//end 定义DB

		$sys_configs = $db->getAll("select * from ".DB_PREFIX."conf");
		$config_str = "
 $v)
		{
			$config_str.="'".$v['name']."'=>'".addslashes($v['value'])."',\n";
		}
		$config_str.=");\n ?>";	
		file_put_contents($filename,$config_str);
		$url = APP_ROOT."/";
		app_redirect($url);
	}
}