PHP 接口

<?php
    interface a
    {
        public function dis1();
    }
    interface b
    {
        public function dis2();
    }
class demo implements a,b
{
    public function dis1()
    {
        echo "method 1...";
    }
    public function dis2()
    {
        echo "method2...";
    }
}
$obj= new demo();
$obj->dis1();
$obj->dis2();
?>

<?php
    interface i1
    {
        public function fun1();
    }
    interface i2
    {
        public function fun2();
    }
class cls1 implements i1,i2
{
    function fun1()
    {
        echo "lidihuo";
    }
    function fun2()
    {
        echo "SSSIT";
    }
}
$obj= new cls1();
$obj->fun1();
$obj->fun2();
?>