3 个月订单价值小于 1 个月订单价值

问：

我有一个报告结构，我们根据特定时间段检索订单值。使用存储的过程从数据库中获取数据。在前端：这是我编程的：

    $curPage = $this->getRequest()->getParam('curPage', null);
    $numPerPage = $this->getRequest()->getParam('numPerPage', null);
    $search = $this->getRequest()->getParam('search', '');
    $period = $this->getRequest()->getParam('period', '');
        $index = $this->getRequest()->getParam('index', 1);

    $labels = [];
    $dataArr = [];
    $data = [];
    $colors = [];
    $startDate = '2017-01-01';
    $endDate = date('Y-m-d');
    if ($period == 'LM') {
      $now = date_create(date('Y-m-d'));
      $period = date('Y-m-d', strtotime('-' . '90' . ' days'));
      $startDate1 = date('Y-m-d', strtotime("first day of -1 month"));
      $endDate = date('Y-m-d', strtotime("last day of -1 month"));
      $p = intval(90);
    } else if ($period == 'PM') {
      $now = date_create(date('Y-m-d'));
      $period = date('Y-m-d', strtotime('-' . '90' . ' days'));
      $startDate1 = date('Y-m-d', strtotime("first day of -2 month"));
      $endDate = date('Y-m-d', strtotime("last day of -2 month"));
      $p = intval(90);
    } else if ($period == 'TM') {
      $now = date_create(date('Y-m-d'));
      $period = date('Y-m-d', strtotime('-' . '90' . ' days'));
      $startDate1 = date('Y-m-d', strtotime("first day of this month"));
      $endDate = date('Y-m-d', strtotime("last day of this month"));
      $p = intval(90);`

现在，当我检查过去 90 天的报告时，它显示的订单价值低于 LM（上个月）报告。

我在编程方面非常陌生，并且卡在根据所选日期范围修复数据中的错误时陷入困境。任何帮助将不胜感激。