php日期方面

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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){                     $newoffset += 1;                 }             }         }              }     //根据偏移天数，递归做等价运算     if($newoffset > 0){         #echo "[{$start} -> {$offset}] = [{$end} -> {$newoffset}]"."<br />\n";         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}"."<br />";         }         $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)."<br />"; $t2 = microtime();echo "use ".($t2-$t1)." s <br />"; echo getEndDay2('2010-05-12',66,$exception)."<br />"; $t3 = microtime();echo "use ".($t3-$t2)." s <br />"; //转载 http://bbs.phpchina.com/thread-186689-1-1.html