php 依赖注入类

class Di implements ArrayAccess{    private $_bindings = array();//服务列表    private $_instances = array();//已经实例化的服务         //获取服务    public function get($name,$params=array()){        //先从已经实例化的列表中查找        if(isset($this->_instances[$name])){ // no Closure             return $this->_instances[$name];        }                 //检测有没有注册该服务        if(!isset($this->_bindings[$name])){            return null;        }                 $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){            echo "---"; print_r($name);  echo "---";            $obj = call_user_func_array($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] = $obj;        }        print_r($obj);        return $obj;    }         //检测是否已经绑定    public function has($name){        return isset($this->_bindings[$name]) or isset($this->_instances[$name]);    }         //卸载服务    public function remove($name){        unset($this->_bindings[$name],$this->_instances[$name]);    }         //设置服务    public function set($name,$class){        $this->_registerService($name, $class);    }         //设置共享服务    public function setShared($name,$class){        $this->_registerService($name, $class, true);    }         //注册服务    private function _registerService($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    public function offsetExists($offset) {        return $this->has($offset);    }         //ArrayAccess接口,以$di[$name]方式获取服务    public function offsetGet($offset) {        return $this->get($offset);    }         //ArrayAccess接口,以$di[$name]=$value方式注册服务，非共享    public function offsetSet($offset, $value) {        return $this->set($offset,$value);    }         //ArrayAccess接口,以unset($di[$name])方式卸载服务    public function offsetUnset($offset) {        return $this->remove($offset);    }}  header("Content-Type:text/html;charset=utf8");class A{    public $name;    public $age;    public function __construct($name=""){        $this->name = $name;    }}   $di = new Di();//匿名函数方式注册一个名为a1的服务$di->set('a1',function($name=""){    echo "--1-"; print_r($name);  echo "--1-";    return new 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$di->set('a3',new A("小唐"));echo "
 "; print_r($di);$a1 = $di->get('a1',array("小李"));echo $a1->name."
";//小李$a1_1 = $di->get('a1',array("小王"));echo $a1->name."w
";//小李echo $a1_1->name."
";//小李 $a2 = $di->get('a2',array("小张"));echo $a2->name."
";//小张$a2_1 = $di->get('a2',array("小徐"));echo $a2->name."
";//小张echo $a2_1->name."
";//小徐 $a3 = $di['a3'];//可以直接通过数组方式获取服务对象echo $a3->name."
";//小唐
http://www.cjjjs.com/paper/gzsh/2017217135916798.aspx
php 依赖注入类

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