PHP 5引入了“类型提示”,它使函数和方法能够声明“类型化”参数(对象).对于大多数情况,端口示例应该不是一项大任务,例如从Java到PHP 5.

一个非常简单的例子：

interface MyClient
{
  public function DOSomething();
  public function doSomethingElse();
}

class MyHighLevelObject
{
  PRivate $client;

  public __construct(MyClient $client)
  {
    $this->client = $client;
  }

  public function getStuffDone()
  {
    if ( any_self_state_check_or_whatever )
      $client->doSomething();
    else
      $client->doSomethingElse();
  }

  // ...
}

class MyDIP implements MyClient
{
  public function doSomething()
  {
    // ...
  }

  public function doSomethingElse()
  {
    // ...
  }
}