PHP依赖倒置(Dependency Injection)代码实例

实现类：

代码如下:
<?php
 
class Container
{
    protected $setings = array();
 
    public function set($abstract, $concrete = null)
    {
        if ($concrete === null) {
            $concrete = $abstract;
        }
 
        $this->setings[$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) {