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CMS中PHP判断系统是否已经安装的方法示例,cms示例

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:

<&#63;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;
}
&#63;>

以上代码是从PHPok中摘录的,为帮助读者加以理解增加了注释,对于读者开发自己的CMS系统有一定的参考价值。

php开源问题

这些建站系统都是mvc模式的,那些css文件都放在存放模板的文件夹下,你可以学习下MVC模式编程,另外,那个install.lock文件不是连接数据库的,是个安装锁定文件,是防止重复安装的,当你运行安装文件中的index.php时都会先检查是否有这个文件存在,如果有的话程序是不能继续安装的,你必须要先删除这个文件才能重新安装,一般的CMS(内容管理系统,就是你说的建站系统)系统都是用这种方式来判断此程序是否已经安装。作为一个php的新手建议你现在不要去看那些cms系统的代码,你应先数量掌握php基本语法,就像你学asp一样,然后在去接触更高深的问题,如mvc编程等等,找本好的教材,像《细说php》这书的确不错,适合初学者(另外我不是为此书做广告的,这是我学php时读过的,感觉很好),内容很详细,有一个mvc程序设计案例和一个cms系统案例教程,你可以学学,不用急,慢慢来,你会懂得。
 

研究PHP语言的CMS系统,应该以怎的思路去读懂程序结构,怎可以看出它是怎架构的?怎实现各个功

首先要有网页设计和网站组建基础知识,才能用好PHPCMS。

本地使用方法:在安装好Apache服务器(网上有一键安装版下载,要找集成MYSQL数据库的那种),然后把安装文件拷贝到本地网站主目录,再按提示一步一步安装就可以使用了,远程使用方法也一样,只不过是空间供应商会帮你事先装好PHP环境,另外必须知道的是连接数据库的用户名和密码,本地默认是root,密码为空!
工作原理:PHPCMS该软件采用模块化开发,支持多种分类方式,使用它可方便实现个性化网站的设计、开发与维护,说白了PHPCMS就是把你网站要用到的功能模块进行一个组合,从而实现网站的建设。
 

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