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这里为啥用exit

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Jun 23, 2016 pm 01:32 PM

下面是ecshop的入口代码，是防止重新安装的，其中exit我不理解。
我现在的理解是：如果上面都不成立，那么就退出了。比如安装了后，然后程序读到这里，一看条件都满足就退出了，退然都退了，整个网站不全挂了，反过来，没有安装他给你安装一下，安装了，就退出执行整个网站程序了，这到底是什么回事，主要是exit的运行机制是啥
if (!file_exists(ROOT_PATH . 'data/install.lock') && !file_exists(ROOT_PATH . 'includes/install.lock')
    && !defined('NO_CHECK_INSTALL'))
{
    header("Location: ./install/index.php\n");

    exit;
}

回复讨论(解决方案)

没有安装就header跳向安装界面
下面的exit就是一种保险的写法吧，万一没跳，也不让你执行后面的程序
exit就是退出，不运行后面的程序

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