[李景山php]每天TP5-20170102|thinkphp5-Env.php

<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006~2016 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <[e-mail]>
// +----------------------------------------------------------------------

namespace think;
// 环境配置 类
class Env
{
    /**
     * 获取环境变量值
     * @param string    $name 环境变量名（支持二级 .号分割）
     * @param string    $default  默认值
     * @return mixed
     */
    public static function get($name, $default = null)// 简单的 环境 函数 获取配置
    {
        $result = getenv(ENV_PREFIX . strtoupper(str_replace('.', '_', $name)));
        if (false !== $result) { // 默认情况 返回
            return $result;
        } else {
            return $default;
        }
    }
}