Heim >Backend-Entwicklung >PHP-Tutorial >PHPCMS配置文件的读取_PHP教程
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PHPCMS的入口文件index.php里的代码较少,主要做了三件事,如下:
<span>//</span><span>1.定义PHPCMS根目录(入口文件所在目录),PHPCMS_PATH全局可用</span> <span>define</span>('PHPCMS_PATH', <span>dirname</span>(<span>__FILE__</span>).<span>DIRECTORY_SEPARATOR) </span><span>//</span><span>2.引入框架入口文件(与入口文件同级的框架目录phpcms中的base.php)</span> <span>include</span> PHPCMS_PATH.'/phpcms/base.php'<span>; </span><span>//</span><span>3.调用框架入口文件中基类pc_base的静态方法create_app(),进行应用程序初始化</span> pc_base::create_app();
代码虽少,但是将 做了很多事的框架入口文件base.php加载进来后,等于直接就进入了PHPCMS的核心。
---------------------------@chenwei 黑眼诗人
简单说下base.php主要做的事:
1.定义一系列常量,如框架路径,缓存文件夹路径等,全局可用。
2.加载框架自带函数库,全局可用。
3.通过读取配置文件,将配置值定义为常量,全局可用。
4.自带PHPCMS基类(pc_base),定义了加载系统类,应用类,数据模型,系统函数库,应用函数库,插件类库,插件数据模型,配置文件等的方法。
define('CSS_PATH', pc_base::load_config('system', 'css_path'));
上面定义了CSS路径为常量,以便 前后台的全局使用,那它是如何加载配置文件的,如下方法:
/** <br /> * 加载配置文件 <br /> * @param string $file 配置文件 <br /> * @param string $key 要获取的配置键 <br /> * @param string $default 默认配置。当获取配置项目失败时该值发生作用。 <br /> * @param boolean $reload 强制重新加载。 <br /> */<br /><span> public</span> <span>static</span> <span>function</span> load_config(<span>$file</span>, <span>$key</span> = '', <span>$default</span> = '', <span>$reload</span> = <span>false</span><span>) { </span> <span>static</span> <span>$configs</span> = <span>array</span><span>(); <span><span>//<span># 定义存放配置值的空数组</span></span></span><br /><br /></span> //----------------------------------------- <span>if</span> (!<span>$reload</span> && <span>isset</span>(<span>$configs</span>[<span>$file</span><span>])) { <span>//<span># 如果重新加载 且 设置了$configs[$file](这里不执行)</span></span></span> <span>if</span> (<span>empty</span>(<span>$key</span><span>)) {</span> <span>return</span> <span>$configs</span>[<span>$file</span><span>]; <span>//<span># <span><span><span>如果配置键为空,返回整个配置数组(配置文件以一维数组形式返回,如:return array('a'=>'','b'=>''))</span></span></span></span></span> } </span><span>elseif</span> (<span>isset</span>(<span>$configs</span>[<span>$file</span>][<span>$key</span><span>])) { </span> <span>return</span> <span>$configs</span>[<span>$file</span>][<span>$key</span><span>]; <span><span>//<span># 如果设置了有配置键的值,返回</span></span></span> } </span><span>else</span><span> {</span> <span>return</span> <span>$default</span><span>; <span><span>//<span># 默认返回配置default</span></span></span> } }<br /> //----------------------------------------- </span> <span>$path</span> = CACHE_PATH.'configs'.DIRECTORY_SEPARATOR.<span>$file</span>.'.php'<span>;<span>//<span># 系统配置文件路径,$path = PHPCMS_PATH.'caches/configs/system.php';</span></span></span> <span>if</span> (<span>file_exists</span>(<span>$path</span><span>)) {</span> <span>$configs</span>[<span>$file</span>] = <span>include</span> <span>$path</span><span>; <span><span><span>//<span># 如果system配置文件存在,引入</span></span></span></span> } </span> <span>if</span> (<span>empty</span>(<span>$key</span><span>)) { <span><span><span><span>//<span># 根据$key取配置值,否则返回default值,同上虚线间代码</span></span></span></span></span></span> <span>return</span> <span>$configs</span>[<span>$file</span><span>]; } </span><span>elseif</span> (<span>isset</span>(<span>$configs</span>[<span>$file</span>][<span>$key</span><span>])) {</span> <span>return</span> <span>$configs</span>[<span>$file</span>][<span>$key</span><span>]; } </span><span>else</span><span> {</span> <span>return</span> <span>$default</span><span>; } }</span>
所以在使用load_config()时,只需传入配置文件名 和 配置键,即可获取配置值; 一般获取配置项的原理类似。