<?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 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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