PHP 인터페이스 언어 및 애플리케이션 시나리오

interface animal {
    //public $age = 2;
    public function eat();}interface monkey extends animal {
    public function run();
    public function cry();}interface wisdom {
    public function think();}interface bird extends animal {
    public function fly();}class Human implements monkey,wisdom {
    public function eat() {
        echo '吃';
    }    public function run() {
        echo '跑';
    }    public function cry() {
        echo '哭';
    }    public function think() {
        echo '思考';
    }
}

abstract class db {
    public abstract function connect($h,$u,$v,$p);

    public abstract function query($sql);

    public abstract function close();}

class oracle extends db {}class mssql extends db {}class postsql extends db {}

class mysql extends db {
    public function connect($h,$h,$h,$h) {
        return true;
    }    public function query($sql) {

    }    public function close() {

    }
}

interface UserBase {
    public function login($u,$p);

    public function logout();}interface UserMsg {
    public function writeMsg($to,$title,$content);
    public function readMsg($from,$title);}interface UserFun {
    public function spit($to);
    public function showLove($to);}