<?phpclass 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$di->set('a3',new A("小唐"));echo "<br/><pre> "; print_r($di);$a1 = $di->get('a1',array("小李"));echo $a1->name."<br/>";//小李$a1_1 = $di->get('a1',array("小王"));echo $a1->name."w<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 |
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