php如何实现多重接口（附代码介绍）

<?php 
interface jiekou_1 //接口1 
{ 
  function setID($id); 
  function getID(); 
}   
interface jiekou_2 //接口2 
{ 
  function setName($name); 
  function getName(); 
}     
class staff implements jiekou_1, jiekou_2 //接口的实现 
{ 
  private $id; 
  private $name; 
  function setID($id) 
  { 
    $this->id = $id; 
  } 
  function getID()  
  { 
    return $this->id; 
  } 
  function setName($name)  
  { 
    $this->name = $name; 
  } 
  function getName()  
  { 
    return $this->name; 
  } 
  function otherFunc() 
  { 
   echo "接口测试"; 
  } 
 } 
?>