php class knowledge --- Interface

<?php
interface wenwa
{
   function eat();
}
interface duwa
{
    function drink();
}
class cpc implements duwa,wenwa
{
    public function eat()
    {
        echo "喜欢吃粤菜"."\n";
    }
    public function drink()
    {
        echo "喜欢喝汤"."\n";
    }
}
$cpc = new cpc();
$cpc->eat();
$cpc->drink();
?>

Output:

I like to eat Cantonese
like soup