PHP依赖倒置(Dependency Injection)代码实例

实现类：

复制代码 代码如下:
<"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：

复制代码 代码如下:
<?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);