PHP框架三（视图）
上一节我们简单地实现了控制器。这一节我们实现一下视图。
这个视图文件非常简单。主要利用的就是ob_start() ,ob_get_content();这个文件位于includes文件夹内
view.php
<?phpclass view{ //视图类型 default / wap public static $view_type = null; public function __construct(){ ob_start(); } public function finish(){ $content = ob_get_contents(); return $content; } public static function set_view_type(){ switch(true){ case stripos($_SERVER['HTTP_USER_AGENT'], 'Windows CE') !== FALSE : self::$view_type = 'wap'; break; default : self::$view_type = 'default'; } } public static function show($location , $param = array()){ if(is_null(self::$view_type)){ self::set_view_type(); } $view = SIMPLE_PATH . '/view/' . self::$view_type . '/' . $location; extract($param, EXTR_OVERWRITE); ob_start(); file_exists($view) ? require $view : exit($view . ' 不存在'); $content = ob_get_contents(); return $content; }}对于OB函数，我们可以简单地认为，在PHP编译之后，它不会立刻返回到页面，而是先放到缓冲区。
上述视图只是做了一个简单的实现，如果我们要扩展它，可以完善set_view_type()方法，也可以增加缓存，还可以增加模板的支持。
具体实现我会在以后的章节加上，今天我们试着使用一下这个VIEW。
还是昨天controller文件夹下的index.php 文件
<?phpclass index{ public function demo(){ view::show('index.htm' , array('message' => 'HELLO WORLD')); }}然后再在view文件夹内新建一个default文件夹，再在新建一个index.htm
<html><head><title></title></head><body> <?php echo $message;?></body></html>
我们运行站点，便可以看到结果，“HELLO WORLD”。
我觉得这个结果，便是每个程序员对新的思想的一种见证。
如果在这个文件中，你还想插入头部，或尾部，只要再新建一个head.htm。然后再在index.htm中加入
<html><head><title></title></head><body> <?php echo $message; view::show('head.htm');?></body></html>就可以实现公共部分的加入了。
至此，我们这个小型的视图类就实现了。
大家可自行去实验，如果不行，我们再交流。
下一节就是我以前在BLOG里介绍的DAO层，即MODULES。
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