<?php
class Animal {
    var $name;
 
    function __construct($name) {
        $this->name = $name;
    }
 
    function play() {
    }
}
 
class Dog extends Animal {
    function __construct($name) {
        parent::__construct($name);
    }
 
    function play() {
        echo "わんわん！" . $this->name . "だよ\n";
    }
}
 
class Cat extends Animal {
    var $sleep;
 
    function __construct($name, $sleep) {
        parent::__construct($name);
        $this->sleep = $sleep;
    }
 
    function play() {
        echo "にゃん！" . $this->name . "だよ\n";
        if($this->sleep == 1) {
            echo "...でも寝る\n";
        }
    }
}
?>
 

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