关于PHP的依赖倒置(Dependency Injection)

后端开发|php教程关于PHP的依赖倒置(Dependency Injection)

PHP,依赖倒置,Dependency,Injection

后端开发-php教程实现类：

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setings[$abstract] = $concrete;    }     public function get($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：

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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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