目录
1、使用容器实现框架加载类运行
2、 创建框架容器类core/fm/Di.php
3、框架使用容器类来执行public/index.php
4、运行效果还是一样
1、使用容器实现框架加载类运行
2、 创建框架容器类core/fm/Di.php
什么是容器？容器就相当于盒子，把很多类放里面，重复利用，防止多次实例化，节约资源等
<?php
namespace fm;
use ArrayAccess;class Di implements ArrayAccess{protected static $instance;protected $instances = [];//已实例化类protected $bind=['core'=>core::class,];//服务列表//单例模式 防止多次newpublic static function getInstance(){if(self::$instance){return self::$instance;}static::$instance = new static;return static::$instance ;}//获取实例化类public static function get($abstract, $vars = []){return static::getInstance()->make($abstract, $vars = []);}//获取类库public function make($abstract, $vars = []){//先从已经实例化的列表中查找if (isset($this->instances[$abstract])) {return $this->instances[$abstract];}//检测有没有注册该服务if(!isset($this->bind[$abstract])){return null;}$concrete = $this->bind[$abstract];//对象具体注册内容$obj = null;//匿名函数方式if($concrete instanceof \Closure){$obj = call_user_func_array($concrete,$vars);}elseif(is_string($concrete)){//字符串方式if(empty($vars)){$obj = new $concrete;}else{//带参数的类实例化，使用反射$class = new \ReflectionClass($concrete);$obj = $class->newInstanceArgs($vars);}}return $obj;}public function bindTo($abstract, $concrete = null){if (is_array($abstract)) {$this->bind = array_merge($this->bind, $abstract);} elseif ($concrete instanceof Closure) {$this->bind[$abstract] = $concrete;} elseif (is_object($concrete)) {if (isset($this->bind[$abstract])) {$abstract = $this->bind[$abstract];}$this->instances[$abstract] = $concrete;} else {$this->bind[$abstract] = $concrete;}return $this;}//检测是否已经绑定public function has($abstract){return isset($this->bind[$abstract]) || isset($this->instances[$abstract]);}//卸载服务public function remove($abstract){return static::getInstance()->delete($abstract);}public function delete($abstract){unset($this->instances[$abstract]);}//继承接口必要继承方法public function offsetExists($offset) {return $this->has($offset);}public function offsetGet($offset) {return $this->make($offset);}public function offsetSet($offset, $value) {$this->bindTo($offset, $value);}public function offsetUnset($offset) {return $this->remove($offset);}public function getIterator() {return new ArrayIterator($this->instances);}public function count() {return count($this->instances);}}3、框架使用容器类来执行public/index.php
<?php
namespace fm;
error_reporting(E_ALL);
ini_set('display_errors', 'On');
// 加载基础文件
require __DIR__ . '/../core/base.php';
Di::get('core')->run();
4、运行效果还是一样
