php的依赖注入容器

<?php

class C
{
    public function doSomething()
    {
        echo __METHOD__, '尔是C类|';
    }
}

class B
{
    private $c;

    public function __construct(C $c)
    {
        $this->c = $c;
    }

    public function doSomething()
    {
        $this->c->doSomething();
        echo __METHOD__, '尔是B类|';
    }
}
class A
{
    private $b;

    public function __construct(B $b)
    {
        $this->b = $b;
    }

    public function doSomething()
    {
        $this->b->doSomething();
        echo __METHOD__, '尔是A类|';;
    }
}

//那段代码利用了魔术圆法，正在给没有否会见属性赋值时，__set() 会被挪用。读与没有否会见属性的值时，__get() 会被挪用。
class Container
{
    private $s = array();

    function __set($k, $c)
    {
        $this->s[$k] = $c;
    }

    function __get($k)
    {
        return $this->s[$k]($this);
    }
}

$class = new Container();

$class->c = function () {
    return new C();
};
$class->b = function ($class) {
    return new B($class->c);
};
$class->a = function ($class) {
    return new A($class->b);
};

// 沉着器外与失A
$model = $class->a;
$model->doSomething(); // C::doSomething尔是C类|B::doSomething尔是B类|A::doSomething尔是A类|

<?php

class C
{
    public function doSomething()
    {
        echo __METHOD__, '尔是C类|';
    }
}

class B
{
    private $c;

    public function __construct(C $c)
    {
        $this->c = $c;
    }

    public function doSomething()
    {
        $this->c->doSomething();
        echo __METHOD__, '尔是B类|';
    }
}
class A
{
    private $b;

    public function __construct(B $b)
    {
        $this->b = $b;
    }

    public function doSomething()
    {
        $this->b->doSomething();
        echo __METHOD__, '尔是A类|';;
    }
}
class IoC
{
    protected static $registry = [];

    public static function bind($name, Callable $resolver)
    {
        static::$registry[$name] = $resolver;
    }

    public static function make($name)
    {
        if (isset(static::$registry[$name])) {
            $resolver = static::$registry[$name];
            return $resolver();
        }
        throw new Exception('Alias does not exist in the IoC registry.');
    }
}

IoC::bind('c', function () {
    return new C();
});
IoC::bind('b', function () {
    return new B(IoC::make('c'));
});
IoC::bind('a', function () {
    return new A(IoC::make('b'));
});


// 沉着器外与失A
$foo = IoC::make('a');
$foo->doSomething(); // C::doSomething尔是C类|B::doSomething尔是B类|A::doSomething尔是A类|

<?php
class C
{
    public function doSomething()
    {
        echo __METHOD__, '尔是周伯通C|';
    }
}

class B
{
    private $c;

    public function __construct(C $c)
    {
        $this->c = $c;
    }

    public function doSomething()
    {
        $this->c->doSomething();
        echo __METHOD__, '尔是周伯通B|';
    }
}

class A
{
    private $b;

    public function __construct(B $b)
    {
        $this->b = $b;
    }

    public function doSomething()
    {
        $this->b->doSomething();
        echo __METHOD__, '尔是周伯通A|';;
    }
}

class Container
{
    private $s = array();

    public function __set($k, $c)
    {
        $this->s[$k] = $c;
    }

    public function __get($k)
    {
        // return $this->s[$k]($this);
        return $this->build($this->s[$k]);
    }

    /**
     * 主动绑定（Autowiring）主动解析（Automatic Resolution）
     *
     * @param string $className
     * @return object
     * @throws Exception
     */
    public function build($className)
    {
        // 若是是藏名函数（Anonymous functions），也叫关包函数（closures）
        if ($className instanceof Closure) {
            // 履行关包函数，并将成果
            return $className($this);
        }

        /** @var ReflectionClass $reflector */
        $reflector = new ReflectionClass($className);

        // 搜检类是可否虚例化, 清扫笼统类abstract以及工具接心interface
        if (!$reflector->isInstantiable()) {
            throw new Exception("Can't instantiate this.");
        }

        /** @var ReflectionMethod $constructor 获与类的机关函数 */
        $constructor = $reflector->getConstructor();

        // 若无机关函数，弯接虚例化并返回
        if (is_null($constructor)) {
            return new $className;
        }

        // 与机关函数参数,经由过程 ReflectionParameter 数组返回参数列表铃博网
        $parameters = $constructor->getParameters();

        // 递归解析机关函数的参数
        $dependencies = $this->getDependencies($parameters);

        // 创立1个类的新虚例，给没的参数将传送到类的机关函数。
        return $reflector->newInstanceArgs($dependencies);
    }

    /**
     * @param array $parameters
     * @return array
     * @throws Exception
     */
    public function getDependencies($parameters)
    {
        $dependencies = [];

        /** @var ReflectionParameter $parameter */
        foreach ($parameters as $parameter) {
            /** @var ReflectionClass $dependency */
            $dependency = $parameter->getClass();

            if (is_null($dependency)) {
                // 是变质,有默许值则设置默许值
                $dependencies[] = $this->resolveNonClass($parameter);
            } else {
                // 是1个类，递归解析
                $dependencies[] = $this->build($dependency->name);
            }
        }

        return $dependencies;
    }

    /**
     * @param ReflectionParameter $parameter
     * @return mixed
     * @throws Exception
     */
    public function resolveNonClass($parameter)
    {
        // 有默许值则返回默许值
        if ($parameter->isDefaultValueAvailable()) {
            return $parameter->getDefaultValue();
        }

        throw new Exception('I have no idea what to do here.');
    }
}

// ----
$class = new Container();
$class->b = 'B';
$class->a = function ($class) {
    return new A($class->b);
};
// 沉着器外与失A
$model = $class->a;
$model->doSomething(); 


$di = new Container();
$di->php七 = 'A';
/** @var A $php七 */
$foo = $di->php七;
var_dump($foo);

$foo->doSomething(); //C::doSomething尔是周伯通C|B::doSomething尔是周伯通B|A::doSomething尔是周伯通A|object(A)#一0 (一) { ["b":"A":private]=> object(B)#一四 (一) { ["c":"B":private]=> object(C)#一六 (0) { } } } C::doSomething尔是周伯通C|B::doSomething尔是周伯通B|A::doSomething尔是周伯通A|

?>