container实现

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纸上得来终觉浅，得知此事需躬行。

之前看phalcon框架DI的实现方式，觉得很好用，但是由于是c扩展，看不了源码，并不知道是如何实现的，后来看laravel的服务容器，发现是实现了php的SPL接口，然后用这些接口实现的。

一个典型的「container」便是实现了arrayaccess，Demo如下。

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<?php
namespace skylee;

class A
{
    public function say()
    {
        return   __METHOD__;
    }
    
}

class B
{

    public function say()
    {
        return   __METHOD__;
    }
}

// 容器
class Container implements \arrayaccess
{

    private $container = array();

    public function __construct(array $array = [])
    {
        $this->container = $array;
    }

    public function __get($id)
    {
        return $this->offsetGet($id);
    }

    public function offsetSet($offset, $value)
    {
        if (is_null($offset))
        {
            $this->container[] = $value;
        }
        else
        {
            $this->container[$offset] = $value;
        }
    }

    public function offsetExists($offset)
    {
        return isset($this->container[$offset]);
    }

    public function offsetUnset($offset)
    {
        unset($this->container[$offset]);
    }

    public function offsetGet($offset)
    { 
        $raw = $this->container[$offset];
        
        return $this->container[$offset] = $raw();
    }
    
    public function register($Manage)
    {
        $Manage->register($this);
    }
}

// provide
interface  ServiceProvide 
{
  public function register(Container $container);
}

class ProvideA implements ServiceProvide
{
    public function register(Container $container)
    {
        $container['A'] = function ()
        {
           return new skylee\A;  
        };
    }
}

class ProvideB implements ServiceProvide
{
    public function register(Container $container)
    {
        $container['B'] = function ()
        {
            return new skylee\B;
        };
    }
}

class App extends Container
{
    public $service = [
        skylee\ProvideA::class,
        skylee\ProvideB::class
    ];
    
    public function __construct()
    {
        parent::__construct();
        
        $this->registerProvide();
    }
    
    public function registerProvide()
    {
        foreach ($this->service as $v)
        {
            $this->register(new $v());
        }
    }
}

$obj = new App();

$a = $obj["A"]->say();

$b = $obj["B"]->say();

var_dump($a);

var_dump($b);