<?php     function format($a,$b){         //检查两个日期大小，默认前小后大，如果前大后小则交换位置以保证前小后大         if(strtotime($a)>strtotime($b)) list($a,$b)=array($b,$a);         $start  = strtotime($a);         $stop   = strtotime($b);         $extend = ($stop-$start)/86400;         $result['extends'] = $extend;         if($extend<7){                //如果小于7天直接返回天数             $result['daily'] = $extend;         }elseif($extend<=31){        //小于28天则返回周数，由于闰年2月满足了             if($stop==strtotime($a.'+1 month')){                 $result['monthly'] = 1;             }else{                 $w = floor($extend/7);                 $d = ($stop-strtotime($a.'+'.$w.' week'))/86400;                 $result['weekly']  = $w;                 $result['daily']   = $d;             }         }else{             $y=    floor($extend/365);             if($y>=1){                //如果超过一年                 $start = strtotime($a.'+'.$y.'year');                 $a     = date('Y-m-d',$start);                 //判断是否真的已经有了一年了，如果没有的话就开减                 if($start>$stop){                     $a = date('Y-m-d',strtotime($a.'-1 month'));                     $m =11;                     $y--;                    }                 $extend = ($stop-strtotime($a))/86400;             }             if(isset($m)){                 $w = floor($extend/7);                 $d = $extend-$w*7;             }else{                 $m = isset($m)?$m:round($extend/30);                 $stop>=strtotime($a.'+'.$m.'month')?$m:$m--;                 if($stop>=strtotime($a.'+'.$m.'month')){                     $d=$w=($stop-strtotime($a.'+'.$m.'month'))/86400;                     $w = floor($w/7);                     $d = $d-$w*7;                 }             }             $result['yearly']  = $y;             $result['monthly'] = $m;             $result['weekly']  = $w;             $result['daily']   = isset($d)?$d:null;         }         return array_filter($result);     }     print_r(format('2012-10-1','2012-12-15')); ?>

/** * @file * @version  1.1 * @author  QQ83989686 * @date  2012-8-7 最后修改时间 * @brief */     //获取某个日期的 周数、周对应的开始结束时间     private function getWeekStartEndDay($day)     {         $g  = strftime("%u",strtotime($day));         return array('week_num'=>strftime("%V",strtotime($day)),'week_start_day'=>strftime('%Y-%m-%d',strtotime($day)-($g-1)*86400),'week_start_day_cn'=>strftime('%Y年%m月%d日',strtotime($day)-($g-1)*86400),'week_end_day'=>strftime('%Y-%m-%d',strtotime($day) + (7-$g)*86400),'week_end_day_cn'=>strftime('%Y年%m月%d日',strtotime($day) + (7-$g)*86400));     }