依赖注入(DI)和控制反转(IOC)【回顾】

　　在java开发中广泛的使用了IOC的思想，在PHP中同样也在广泛使用。

 interface Coder
 {
     public function coding();
 }

实现类Javaer

 class Javaer implements Coder
 {
     var $name;

     public function __construct($name)
     {
         $this->name = $name;
     }
     public function coding()
     {
         echo "$this->name.is coding java code.<br>";
     }
 }

实现类Phper

 class Phper implements Coder
 {
     var $name;

     public function __construct($name)
     {
         $this->name = $name;
     }
     public function coding()
     {
         echo "$this->name.is coding php code.<br>";
     }
 }

业务逻辑类Task

 class Task
 {
     var $name;
     var $owner;

     public function __construct($name)
     {
         $this->name = $name;
     }

     public function setOwner($owner){
         $this->owner = $owner;
     }

     public function start()
     {
         echo "$this->name.started!<br>";
         $this->owner->coding();
     }
 }

测试

         $task = new Task("Task #1");
 //        $owner = new Phper("xiaohb");
         $owner = new Javaer("xiaoxiao");
         $task->setOwner($owner);
         $task->start();

代码的可维护和拓展性显而易见了