在做数据统计图表时，需要计算一个时间段内的周数量，每周的开始时间和结束时间；

下面是php的实现方法：

/**
 * 获取指定时间段内有几周，每周的开始日期和结束日期
 * @return [] [[s:开始日期，e:结束日期],[s:开始日期，e:结束日期]]
 */
function count_weeks($start_string, $end_string = '')
{       
    $startDate = date('Y-m-d', strtotime($start_string) );
    if(empty($end_string)) {
        $endDate = date('Y-m-d');
    }else{
        $endDate = date('Y-m-d', strtotime($end_string));
    }
    
    $sw = date("Ymw",strtotime($startDate));
    $ew = date("Ymw",strtotime($endDate));
    if($sw == $ew){            
        $weekList[] =array('s'=>  date("Y-m-d",strtotime("this week 00:00:00", strtotime($startDate))), 'e'=> date("Y-m-d",strtotime("next week 00:00:00 -1second", strtotime($endDate))));        
    }else{
        
        $week_end    = date("Y-m-d",strtotime("next week 00:00:00  -1second", strtotime($startDate)));            
        $weekList[]  = array('s'=>date("Y-m-d", strtotime("this week 00:00:00", strtotime($startDate))), 
                    'e'=> date("Y-m-d",strtotime("next week 00:00:00  -1second", strtotime($startDate))) ); 

        if($week_end >= $endDate){
            $weekList[] = array('s'=> strtotime("this week 23:59:59", strtotime($startDate)), 
            'e'=> strtotime("next week 00:00:00", strtotime($endDate)));
           
        }else{ 
            while($week_end <= $endDate){
                $start         = date("Y-m-d",strtotime(" +1 day", strtotime($week_end)));
                $week_end     = date("Y-m-d",strtotime("next week 00:00:00  -1second", strtotime($start)));
                if($week_end <= $endDate){
                    $weekList[]  = array('s'=>$start, 'e'=>date("Y-m-d",strtotime("$week_end")));
                }else{
                    $weekList[]  = array('s'=>$start, 'e'=>date("Y-m-d",strtotime("next week 00:00:00  -1second",strtotime("$endDate") )));
                }
            }
        }
    }
    return $weekList;
}

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