php计算四柱(生辰八字)

niangan = $last - 3;
        $tiangan = $a[$this->niangan - 1];
        $last = $year % 100;
        if($year >= 1800 && $year <= 1899)
        {
            $nianzhi = $last + 9;
        }
        else if($year >= 1900 && $year <= 1999)
        {
            $nianzhi = $last + 1;
        }
        else if($year >= 2000 && $year <= 2099)
        {
            $nianzhi = $last + 5;
        }
        if($nianzhi > 12)
        {
            $nianzhi %= 12;
        }
        $this->nianzhi = $nianzhi;
        $dizhi = $b[$nianzhi - 1];
        return $tiangan . $dizhi;
    }
    function yuezhu($month)
    {
        $a = array('甲','乙','丙','丁','戊','己','庚','辛','壬','癸');
        $b = array('寅','卯','辰','巳','午','未','申','酉','戌','亥','子','丑');
        $this->yuegan = $this->niangan * 2 + $month;
        if($this->yuegan > 10)
        {
            $this->yuegan %= 10;
        }
        return $a[$this->yuegan - 1] . $b[$month - 1];
    }
    function rizhu($year,$month,$day)
    {
        $a = array('甲','乙','丙','丁','戊','己','庚','辛','壬','癸');
        $b = array('子','丑','寅','卯','辰','巳','午','未','申','酉','戌','亥');
        $today = strtotime("{$year}-{$month}-{$day}");
        $year_start = strtotime("{$year}-01-01");
        $days = ( $today - $year_start )/86400 + 1;
        $n = (int)(($year - 1900) * 5 + ($year - 1900 + 3) / 4 + 9 + $days);
        $n = $n % 60;
        $this->rigan = $n % 10;
        if($this->rigan == 0)
        {
            $this->rigan = 10;
        }
        $dizhi = $n % 12;
        if($dizhi == 0)
        {
            $dizhi = 12;
        }
        return $a[$this->rigan - 1] . $b[$dizhi - 1];
    }
    function shizhu($hour)
    {
        $a = array('甲','乙','丙','丁','戊','己','庚','辛','壬','癸');
        $b = array('子','丑','寅','卯','辰','巳','午','未','申','酉','戌','亥');
        if($hour >= 23 || $hour < 1)
        {
            $shizhi = 1;
        }
        else if($hour >= 1 && $hour < 3)
        {
            $shizhi = 2;
        }
        else if($hour >= 3 && $hour < 5)
        {
            $shizhi = 3;
        }
        else if($hour >= 5 && $hour < 7)
        {
            $shizhi = 4;
        }
        else if($hour >= 7 && $hour < 9)
        {
            $shizhi = 5;
        }
        else if($hour >= 9 && $hour < 11)
        {
            $shizhi = 6;
        }
        else if($hour >= 11 && $hour < 13)
        {
            $shizhi = 7;
        }
        else if($hour >= 13 && $hour < 15)
        {
            $shizhi = 8;
        }
        else if($hour >= 15 && $hour < 17)
        {
            $shizhi = 9;
        }
        else if($hour >= 17 && $hour < 19)
        {
            $shizhi = 10;
        }
        else if($hour >= 19 && $hour < 21)
        {
            $shizhi = 11;
        }
        else if($hour >= 21 && $hour < 23)
        {
            $shizhi = 12;
        }
        $n = $this->rigan * 2 + $shizhi - 2;
        if($n > 10)
        {
            $n %= 10;
        }
        return $a[$n - 1] . $b[$shizhi - 1];
    }
    
    public function test(){
        $a= $this->rizhu(2049, 11, 2);
        var_dump($a);
    }
}