<?
class greeting{
　function hello(){ return "こんにちは"; }
　function goodevening(){ return "こんばんは"; }
}
class bibiru extends greeting{
　function goodevening(){ return "こんばんみ"; }
}
class arare extends greeting{
　function hello(){ return "んちゃ"; }
}
$bibiru = new bibiru();
echo $bibiru->hello()." ".$bibiru->goodevening()."<br>";
$arare = new arare();
echo $arare->hello()." ".$arare->goodevening()."<br>";
?>