CMS中PHP判断系统是否已经安装的方法示例
这篇文章主要介绍了CMS中PHP判断系统是否已经安装的方法示例,需要的朋友可以参考下
当今很多常用的CMS系统都带有安装程序,为了用户的使用方便,新下载的系统在使用前,都会判断该CMS系统是否已经安装过,若安装了则就给出提示,不需要重复安装,若未安装则进入安装界面,指导用户按步骤顺利安装CMS,那么基于PHP环境的CMS到底是如何用代码来实现这种判断机制呢?下面通过一个实例代码加以说明:
<?php define("PHPOK_SET",true); define("APP_ID","www"); //定义应用的根目录!(这个不是系统的根目录)本程序将应用目录限制在独立应用下 define("ROOT",str_replace("\\","/",dirname(__FILE__))."/"); //如果程序出程,请将ROOT改为下面这一行 //define("ROOT","./"); //定义框架 define("FRAMEWORK",ROOT."framework/"); //检测是否已安装,如未安装跳转到安装页面 //建议您在安装成功后去除这个判断。 if(!is_file(ROOT."data/install.lock"))//这个文件是当系统安装完成后会生成,特用来判断是否安装过 { header("Location:install/index.php"); exit; } ?>

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