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