状态模式

<?php
class State{
    function WriteProgram(){
    }
}

class Work{
    public $hour,$current;
    function __construct(){
        $this -> hour = 9;
        $this -> current = new ForenoonState();
    }
    function SetState($temp){
        $this -> current = $temp;
    }
    function WriteProgram(){
        $this -> current -> WriteProgram($this);
    }
}

class NoonState extends State{
    function WriteProgram($w){
        print "noon working\n";
        if($w -> hour < 13){
            print "fun.\n";
        }else{
            print "need to rest\n";
        }
    }
}

class ForenoonState extends State{
    function WriteProgram($w){
        if($w -> hour < 12){
            print "morning working\n";
        }else{
            $w -> SetState(new NoonState());
            $w -> WriteProgram();
        }
    }
}

$mywork = new Work();
$mywork -> hour = 9;
$mywork -> WriteProgram();
$mywork -> hour = 14;
$mywork -> WriteProgram();
?>