类继承多接口

<?php 

interface iUsb1 {

public function test1();

}

interface iUsb2{

public function test2();

}

interface iUsb3 extends iUsb1,iUsb2{

public function test3();

}

class A implements iUsb3{

public function test1(){

echo '<br> test1()';

}

public function test2(){

echo '<br> test2()';

}

public function test3(){

echo '<br> test3()';

}

}

?>