这篇文章主要介绍了PHP依赖倒置(Dependency Injection)代码实例本文只提供实现代码,需要的朋友可以参考下
实现类：
<?php class Container{ protected $setings = array(); public function set($abstract, $concrete = null) { if ($concrete === null) { $concrete = $abstract; } $this->setings[$abstract] = $concrete; } public function ge<em style="color:transparent">本@文来源[email protected]搞@^&代*@码网(</em><q>搞代gaodaima码</q>t($abstract, $parameters = array()) { if (!isset($this->setings[$abstract])) { return null; } return $this->build($this->setings[$abstract], $parameters); } public function build($concrete, $parameters) { if ($concrete instanceof Closure) { return $concrete($this, $parameters); } $reflector = new ReflectionClass($concrete); if (!$reflector->isInstantiable()) { throw new Exception("Class {$concrete} is not instantiable"); } $constructor = $reflector->getConstructor(); if (is_null($constructor)) { return $reflector->newInstance(); } $parameters = $constructor->getParameters(); $dependencies = $this->getDependencies($parameters); return $reflector->newInstanceArgs($dependencies); } public function getDependencies($parameters) { $dependencies = array(); foreach ($parameters as $parameter) { $dependency = $parameter->getClass(); if ($dependency === null) { if ($parameter->isDefaultValueAvailable()) { $dependencies[] = $parameter->getDefaultValue(); } else { throw new Exception("Can not be resolve class dependency {$parameter->name}"); } } else { $dependencies[] = $this->get($dependency->name); } } return $dependencies; }}
实现实例：
<?php require 'container.php'; interface MyInterface{}class Foo implements MyInterface{}class Bar implements MyInterface{}class Baz{ public function __construct(MyInterface $foo) { $this->foo = $foo; }} $container = new Container();$container->set('Baz', 'Baz');$container->set('MyInterface', 'Foo');$baz = $container->get('Baz');print_r($baz);$container->set('MyInterface', 'Bar');$baz = $container->get('Baz');print_r($baz);
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转载请注明原文链接：关于PHP的依赖倒置(Dependency Injection)
转载请注明原文链接：关于PHP的依赖倒置(Dependency Injection)
