获取一周，一月的所有日期方法

• 获取一周

  $get_week = function ($time = '', $format='Y-m-d'){
              $time = $time != '' ? $time : time();
              //获取当前周几
              $week = date('w', $time);
              $date = [];
              for ($i=1; $i<=7; $i++){
                  $date[$i] = date($format ,strtotime( '+' . $i-$week .' days', $time));
              }
              return $date;
          };

• 获取一月

  $get_month = function ($time = '', $format='Y-m-d'){
              $time = $time != '' ? $time : time();
              // 获取天
              $day = (int)date('d', $time);
              // 获取月份有多少天
              $t = date('t', $time);
              $date = [];
              for ($i=1; $i<=$t; $i++){
                  dump('+' . $i-$day .' days');
                  $date[$i] = date($format ,strtotime( '+' . $i-$day .' days', $time));
              }
              return $date;
          };

• 获取近七天

  $get_near_day = get_weeks($time = '', $format='Y-m-d'){
    $time = $time != '' ? $time : time();
    $date = [];
    for ($i=1; $i<=7; $i++){
      $date[$i] = date($format ,strtotime( '+' . $i-7 .' days', $time));
    }
    return $date;
  };