php框架开发2(SPL库和controller)
php框架开发二(SPL库和controller)
根据上话的目录结构(如果不清楚的可以看上一篇)。我在simple文件夹内新建了一个simple.php.
<p>require 'includes/exceptions.php'; require 'includes/autoloader.php'; session_start();</p><p>//$view = new view(); lib::set_item('controller' , new controller()); lib::get_item('controller' , lib::PERSIST_STORGE)->render(); //$content = $view->finish();</p>
这一章主要是讲SPL,所以我们只看第二行的autoloader.php.当我们在index.php中加入
require 'simple/simple.php';
之后。
我们看一下autoloader.php的源码
<?php class autoloader{ public static function includesautoloader($class){ $path = defined('SIMPLE_PATH') ? SIMPLE_PATH : $_SERVER['DOCUMENT_ROOT']; $file_name = $path . '/includes/' . $class . '.php'; if(is_readable($file_name)) require $file_name; } public static function modulesautoloader($class){ $path = defined('SIMPLE_PATH') ? SIMPLE_PATH : $_SERVER['DOCUMENT_ROOT']; $file_name = $path . '/modules/' . $class . '.php'; if(is_readable($file_name)) require $file_name; } public static function controllerautoloader($class){ $path = defined('SIMPLE_PATH') ? SIMPLE_PATH : $_SERVER['DOCUMENT_ROOT']; $file_name = $path . '/controller/' . $class . '.php'; if(is_readable($file_name)) require $file_name; } } spl_autoload_register('autoloader::includesautoloader'); spl_autoload_register('autoloader::modulesautoloader'); spl_autoload_register('autoloader::controllerautoloader');
这个类都是静态方法,当引用这个PHP文件后,程序会自动载入这三个文件夹下的内容,这样我们不用重复去required 或include。如果对SPL有不了解的,可以直接去百度,这里只是告诉大家,这个SPL作用相当广。
然后在includes文件夹内新建一个lib.php
<?php class lib{ const SETTING_ARRAY = true; const PERSIST_STORGE = false; public static function set_item($name , $value , $is_array = false){ if($is_array){ $_SESSION[$name] = array(); $_SESSION[$name][] = $value; } else{ $_SESSION[$name] = $value; } } public static function get_item($name , $persist = true){ $result = null; if(isset($_SESSION[$name])){ $result = $_SESSION[$name]; } if(!$persist){ unset($_SESSION[$name]); } return $result; } public static function sendto($url = ''){ if(empty($url)){ $url = '/'; } die(header('Location:' . $url)); } }
这个类目前只用于设置SESSION相关的内容。
当执行到lib::set_item('controller' , new controller());时,这里新建了一个控制器对象,并对象存入SESSION中。
controller.php
<?php class controller{ //URL部分 protected $parts; //方法参数 protected $params; public function __construct(){ $this->parts = array(); $this->analysis(); } public function analysis(){ $path_info = $_SERVER['PATH_INFO']; if(substr($path_info , 0 , 1) == '/'){ $path_info = substr($path_info , 1); } $parts = explode('/' , $path_info); if(empty($parts[0])) $parts[0] = 'index'; if(empty($parts[1])) $parts[1] = 'demo'; $this->parts = $parts; array_shift($parts); array_shift($parts); $this->params = $parts; } public function render(){ if(!class_exists($this->parts[0])){ throw new ControllerDoesntExistsException($this->parts[0] . ' not exists!'); } if(!method_exists($this->parts[0] , $this->parts[1])){ throw new ActionDoesntExistsException($this->parts[0] . 'of ' . $this->parts[1] . ' not exists!'); } $new_controller = new $this->parts[0]; $called = call_user_func_array(array($new_controller , $this->parts[1]) , $this->params); if($called === false){ throw new ActionFailedException($this->parts[0] . 'of ' . $this->parts[1] . ' failed to excute property!'); } } }
这个类只用PATH_INFO模式来获取调用的控制器和ACTION,并将参数传递到相应的ACTION方法里。当controller初始化之后,会自动分析PATH_INFO的内容,
lib::get_item('controller' , lib::PERSIST_STORGE)->render();
然后调用render()就会在相应的控制器目录找到控制器和ACTION。
例如我在controller文件夹内新建一个index.php
<?php class index{ public function demo(){ echo "sdfsdf"; } }
那么执行http://localhost/index.php/index/demo就会输出"sdfsdf";(这是我的本地路径)。
以上代码难度不高,如果没有看懂的同学,请Q我,也可以去PHP官网上去查找相应函数的用法。
下一节相会对视图作一个简单的介绍。

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