This article mainly introduces the dependency injection, container and appearance mode (lower part) about chatting framework development. It has a certain reference value. Now I share it with you. Friends in need can refer to it
Appearance mode: facade, also called facade mode
1. In one sentence: it encapsulates operations and provides a unified interface to the outside world
2. Because operations may be distributed in multiple classes , and the container I just learned can encapsulate different classes and implementations
3. Therefore, appearance mode and dependent containers are golden partners, and are often used together
<?php /** * 用户登录的操作涉及三个操作 * 1.连接数据库 * 2.用户数据验证 * 3.输出提示信息 */ require 'container.php'; //创建Facade类,实现以上三个功能 class Facade { //连接数据库 public static function connect(Container $container) { return $container->make('db')->connect(); } //用户数据验证 public static function check(Container $container) { return $container->make('validate')->check(); } //输出提示信息 public static function display(Container $container) { return $container->make('view')->display(); } } //客户端调用 echo Facade::connect($container); echo Facade::check($container); echo Facade::display($container); //可以在外观模型中使用初始化方法事先注入容器对象,来简化客户端调用 require 'container.php'; class Facade { //创建成员属性保存容器对象 protected static $container = null; //创建初始化方法为容器对象赋值 public static function initialize(Container $container) { static::$container = $container; } /** * 因为已经在初始化方法中将容器对象导入到了当前类中, * 并且保存到了类的静态属性中,为所有类成员所共享, * 所以以下方法可直接调用不用再容器注入 * 注意:这里全部采用后期静态延迟绑定方法来访问当前容器对象 * 这主要是为了方便用户在静态继承的上下文环境中进行调用 */ //连接数据库 public static function connect() { return static::$container->make('db')->connect(); } //用户数据验证 public static function check() { return static::$container->make('validate')->check(); } //输出提示信息 public static function display() { return static::$container->make('view')->display(); } } //客户端调用 //初始化类门面类中的容器对象 Facade::initialize($container); //静态统一调用内部的方法(无须重复注入依赖容器对象啦,实现了细节隐藏,通用性更强) echo Facade::connect(); echo Facade::check(); echo Facade::display();
The following Integrate the code together:
<?php //数据库操作类 class Db { //数据库连接 public function connect() { return '数据库连接成功<br>'; } } //数据验证类 class Validate { //数据验证 public function check() { return '数据验证成功<br>'; } } //视图图 class View { //内容输出 public function display() { return '用户登录成功'; } } /******************************************************************************/ //一.创建容器类 class Container { //创建属性,用空数组初始化,该属性用来保存类与类的实例化方法 public $instance = []; //初始化实例数组,将需要实例化的类,与实例化的方法进行绑定 public function bind($abstract, Closure $process) { //键名为类名,值为实例化的方法 $this->instance[$abstract] = $process; } //创建类实例 public function make($abstract, $params=[]) { return call_user_func_array($this->instance[$abstract],[]); } } /******************************************************************************/ //二、服务绑定: 将类实例注册到容器中 $container = new Container(); //将Db类绑定到容器中 $container->bind('db', function(){ return new Db(); }); //将Validate类实例绑定到容器中 $container->bind('validate', function(){ return new Validate(); }); //将View类实例绑定到容器中 $container->bind('view', function(){ return new View(); });
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