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由年份及第几周得出其起码与结束时间
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Chen Liqiang  
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 More options May 18 2007, 3:52 am
From: Chen Liqiang <chen...@gmail.com>
Date: Fri, 18 May 2007 07:52:19 -0000
Local: Fri, May 18 2007 3:52 am
Subject: 由年份及第几周得出其起码与结束时间
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function getWeekStart($year, $weekOrder){
        $weekDay = date('N', mktime(0,0,0, 1, 1, intval($year)));
        $diff = (8 - $weekDay) < 7 ? (8 - $weekDay) : 0;
        $days = ($weekOrder - 1) * 7 + 1;
        if (($days + $diff) < 31){
                return $year . '-01-' . sprintf('%02s', ($days + $diff));
        }
        for ($i=1; $i<=12; $i++){
                $tDays = daysOfMonth($year, $i);
                if (($days + $diff) < $tDays){
                        return $year . '-' . sprintf('%02s',$i) . '-' . sprintf('%02s',
($tDays + $diff));
                }
                $days -= $tDays;
                if ($days < daysOfMonth($year, $i + 1)){
                        if (($days + $diff) > 0){
                                return $year . '-' . sprintf('%02s', ($i + 1)) . '-' .
sprintf('%02s', ($days + $diff));
                        } else {
                                return $year . '-' . sprintf('%02s', $i) . '-' . sprintf('%02s',
($days + $tDays + $diff));
                        }
                }
        }

}

function getWeekEnd($year, $weekOrder){
        $weekDay = date('N', mktime(0,0,0, 1, 1, intval($year)));
        $diff = (8 - $weekDay) < 7 ? (8 - $weekDay) : 0;
        $days = $weekOrder * 7;
        if (($days + $diff) < 31){
                return $year . '-01-' . sprintf('%02s', ($days + $diff));
        }
        for ($i=1; $i<=12; $i++){
                $tDays = daysOfMonth($year, $i);
                if (($days + $diff) < $tDays){
                        return $year . '-' . sprintf('%02s',$i) . '-' . sprintf('%02s',
($tDays + $diff));
                }
                $days -= $tDays;
                if ($days < daysOfMonth($year, $i + 1)){
                        if (($days + $diff) > 0){
                                return $year . '-' . sprintf('%02s', ($i + 1)) . '-' .
sprintf('%02s', ($days + $diff));
                        } else {
                                return $year . '-' . sprintf('%02s', $i) . '-' . sprintf('%02s',
($days + $tDays + $diff));
                        }
                }
        }
}

function daysOfMonth($year,$month){
        switch($month){
        case 1:
        case 3:
        case 5:
        case 7:
        case 8:
        case 10:
        case 12: return 31;
        case 4:
        case 6:
        case 9:
        case 11:
        case 13: return 30;
        case 2:
                if ( $year/400 == 0 || ($year/4 == 0 && $year/100 != 0) ){
                        return 29;
                } else {
                        return 28;
                }
        default: return 0;
        }


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