PHP写的一个轻量级的DI容器类(转)

<?php
class Di implements \ArrayAccess{
    private$_bindings = array();//服务列表private$_instances = array();//已经实例化的服务
     
    //获取服务publicfunction get($name,$params=array()){
        //先从已经实例化的列表中查找if(isset($this->_instances[$name])){
            return$this->_instances[$name];
        }
         
        //检测有没有注册该服务if(!isset($this->_bindings[$name])){
            returnnull;
        }
         
        $concrete = $this->_bindings[$name][‘class‘];//对象具体注册内容$obj = null;
        //匿名函数方式if($concrete instanceof \Closure){
            $obj = call_user_func_array($concrete,$params);
        }
        //字符串方式elseif(is_string($concrete)){
            if(empty($params)){
                $obj = new$concrete;
            }else{
                //带参数的类实例化，使用反射$class = new \ReflectionClass($concrete);
                $obj = $class->newInstanceArgs($params);
            }
        }
        //如果是共享服务，则写入_instances列表，下次直接取回if($this->_bindings[$name][‘shared‘] == true && $obj){
            $this->_instances[$name] = $obj;
        }
         
        return$obj;
    }
     
    //检测是否已经绑定publicfunction has($name){
        returnisset($this->_bindings[$name]) or isset($this->_instances[$name]);
    }
     
    //卸载服务publicfunction remove($name){
        unset($this->_bindings[$name],$this->_instances[$name]);
    }
     
    //设置服务publicfunction set($name,$class){
        $this->_registerService($name, $class);
    }
     
    //设置共享服务publicfunction setShared($name,$class){
        $this->_registerService($name, $class, true);
    }
     
    //注册服务privatefunction _registerService($name,$class,$shared=false){
        $this->remove($name);
        if(!($class instanceof \Closure) && is_object($class)){
            $this->_instances[$name] = $class;
        }else{
            $this->_bindings[$name] = array("class"=>$class,"shared"=>$shared);
        }
    }
     
    //ArrayAccess接口,检测服务是否存在publicfunction offsetExists($offset) {
        return$this->has($offset);
    }
     
    //ArrayAccess接口,以$di[$name]方式获取服务publicfunction offsetGet($offset) {
        return$this->get($offset);
    }
     
    //ArrayAccess接口,以$di[$name]=$value方式注册服务，非共享publicfunction offsetSet($offset, $value) {
        return$this->set($offset,$value);
    }
     
    //ArrayAccess接口,以unset($di[$name])方式卸载服务publicfunction offsetUnset($offset) {
        return$this->remove($offset);
    }
}

<?php
header("Content-Type:text/html;charset=utf8");
class A{
    public$name;
    public$age;
    publicfunction __construct($name=""){
        $this->name = $name;
    }
}
 
include "Di.class.php";
$di = new Di();
//匿名函数方式注册一个名为a1的服务$di->setShared(‘a1‘,function($name=""){
    returnnew A($name);
});
//直接以类名方式注册$di->set(‘a2‘,‘A‘);
//直接传入实例化的对象$di->set(‘a3‘,new A("小唐"));
 
$a1 = $di->get(‘a1‘,array("小李"));
echo$a1->name."<br/>";//小李$a1_1 = $di->get(‘a1‘,array("小王"));
echo$a1->name."<br/>";//小李echo$a1_1->name."<br/>";//小李$a2 = $di->get(‘a2‘,array("小张"));
echo$a2->name."<br/>";//小张$a2_1 = $di->get(‘a2‘,array("小徐"));
echo$a2->name."<br/>";//小张echo$a2_1->name."<br/>";//小徐$a3 = $di[‘a3‘];//可以直接通过数组方式获取服务对象echo$a3->name."<br/>";//小唐