【www.gdgbn.com--php常用代码】

date_default_timezone_set("prc");
/**
* 求取从某日起经过一定天数后的日期,
* 排除周六周日和节假日
* @param $start       开始日期
* @param $offset      经过天数
* @param $exception 例外的节假日
* @param $allow       允许的日期(预留参数)
* @return
*  examples:输入(2010-06-25,5,""),得到2010-07-02
*/
function getendday( $start="now", $offset=0, $exception="", $allow="" ){
    //先计算不排除周六周日及节假日的结果
    $starttime = strtotime($start);
    $endtime = $starttime + $offset * 24 * 3600;
    $end = date("y-m-d", $endtime);
    //然后计算周六周日引起的偏移
    $weekday = date("n", $starttime);//得到星期值：1-7
    $remain = $offset % 7;
    $newoffset = 2 * ($offset - $remain) / 7;//每一周需重新计算两天
    if( $remain > 0 ){//周余凑整
        $tmp = $weekday + $remain;
        if( $tmp >= 7 ){
            $newoffset += 2;
        }else if( $tmp == 6 ){
            $newoffset += 1;
        }
        //考虑当前为周六周日的情况
        if( $weekday == 6 ){
            $newoffset -= 1;
        }else if( $weekday == 7 ){
            $newoffset -= 2;
        }
    }
    //再计算节假日引起的偏移
    if( is_array($exception) ){//多个节假日
        foreach ($exception as $day){
            $tmp_time = strtotime($day);
            if( $tmp_time>$starttime && $tmp_time<=$endtime ){//在范围(a,b]内
                $weekday_t = date("n", $tmp_time);
                if($weekday_t <= 5){//防止节假日与周末重复
                    $newoffset += 1;
                }
            }
        }
    }else{//单个节假日
        if( $exception!="" ){
            $tmp_time = strtotime($exception);
            if( $tmp_time>$starttime && $tmp_time<=$endtime ){
                $weekday_t = date("n", $tmp_time);
                if($weekday_t <= 5){
                    $newoffset += 1;
                }
            }
        }
       
    }
    //根据偏移天数，递归做等价运算111cn.net
    if($newoffset > 0){
        #echo "[{$start} -> {$offset}] = [{$end} -> {$newoffset}]"."
";
        return getendday($end,$newoffset,$exception,$allow);
    }else{
        return $end;
    }
}
/**
* 暴力循环方法
*/
function getendday2( $start="now", $offset=0, $exception="", $allow="" ){
    $starttime = strtotime($start);
    $tmptime = $starttime + 24*3600;
   
    while( $offset > 0 ){
        $weekday = date("n", $tmptime);
        $tmpday = date("y-m-d", $tmptime);
        $bfd = false;//是否节假日
        if(is_array($exception)){
            $bfd = in_array($tmpday,$exception);
        }else{
            $bfd = ($exception==$tmpday);
        }
        if( $weekday<=5 && !$bfd){//不是周末和节假日
            $offset--;
            #echo "tmpday={$tmpday}"."
";
        }
        $tmptime += 24*3600;
    }
   
    return $tmpday;
}
$exception = array(
    "2010-01-01","2010-01-02","2010-01-03",
    "2010-04-03","2010-04-04","2010-04-05",
    "2010-05-01","2010-05-02","2010-05-03",
    "2010-06-14","2010-06-15","2010-06-16",
    "2010-09-22","2010-09-23","2010-09-24",
    "2010-10-01","2010-10-02","2010-10-03","2010-10-04",
    "2010-10-05","2010-10-06","2010-10-07",
   
);
//echo getendday("2010-08-27",3,"");
//echo getendday("2010-06-25",15,"2010-07-07");
$t1 = microtime();
echo getendday("2010-05-12",66,$exception)."
";
$t2 = microtime();echo "use ".($t2-$t1)." s
";
echo getendday2("2010-05-12",66,$exception)."
";
$t3 = microtime();echo "use ".($t3-$t2)." s
";

本文来源：http://www.gdgbn.com/jiaocheng/25528/