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问题二，这个其实也不算问题，就是写法上的优化,我们是不是每次都要传递第二个参数并且每次都要写一个闭包进去？

# class Container# 复制上面的代码

class Person{
    public $name;
}

$container = new Container();
$container->bind('person' , function(){
    return new Person();
},true);

　　

我们来分析一下，实际上我已经知道了Person类，那么我们能不能想下面代码中的这么实现呢

...
$container = new Container();
$container->bind('Person' , 'Person' , true);
$container->bind('Person');
...

　　

接下来继续改进

class Container {

    private $bindings = [];

    private $instances = [];

    #这里是生成闭包的地方
    public function getClosure($concrete) {
        return function() use($concrete) {
            return new $concrete;
        };
    }

    public function bind($abstract , $concrete=null, $shared = false)
    {
        if (is_null($concrete)) {
            $concrete = $abstract;
        }

        # 如果$concrete 不是一个闭包生成一个闭包
        if (!$concrete instanceof Closure) {
            $concrete = $this->getClosure($concrete);
        }

        $this->bindings[$abstract] = [
            'concrete' => $concrete,
            'shared' => $shared
        ];
    }

    public function make($abstract) {
        if (!isset($this->bindings[$abstract])) {
            return false;
        }

        if (isset($this->instances[$abstract])) {
            return $this->instances[$abstract];
        }

        $object = $this->bindings[$abstract]['concrete']();
        if($this->bindings[$abstract]['shared']) {
            $this->instances[$abstract] = $object;
        }

        return $object;
    }
}

class Person{
    public $name;
}

# testing
$container = new Container();
$container->bind('Person' , 'Person' , false);
$p1 = $container->make('Person');
$p2 = $container->make('Person');
var_dump($p1 , $p2 , $p1 === $p2);

$c1 = new Container();
$c1->bind('Person');
$p3 = $c1->make('Person');
$p4 = $c1->make('Person');
var_dump($p3 , $p4 , $p3 === $p4);

$c2 = new Container();
$c2->bind('Person','Person', true);
$p5 = $c2->make('Person');
$p6 = $c2->make('Person');
var_dump($p5 , $p6 , $p5 === $p6);

　　

入门我们自己写这个container大部门人会在make里去判断是否是一个闭包，写完就不再优化了...