我想根据日期的持续时间更改整行的颜色。 例如，如果日期的持续时间在 3 到 6 之间，则颜色为橙色；超过6个必须显示为红色。我可以知道我该怎么做吗？

foreach ($ary_list as $k => $v) {

 $color= xxx;
 echo "";
 echo  "\n";
  echo "\n";
  echo  "\n";
  echo  "  " .$v["seal_area"]. "     ";
  echo  "\n";
  echo  "\n";

  echo "\n";
  echo  "\n";
  echo  "  " .$v["seal_barcode"]. "     ";
  echo  "\n";
  echo  "\n";
  
  echo "\n";
  echo  "\n";
  echo  "  " .$v["dt_issue"]. "     ";
  echo  "\n";
  echo  "";  
  
  echo "\n";
  echo  "\n";
  echo  "  " .$v["issue_admin"]. "     ";
  echo  "\n";
  echo  "";
  
  echo "\n";
  echo  "\n";
  echo  "  " .$v["receive_by"]."     ";
  echo  "\n";
  echo  "";

  echo "\n";
  echo  "\n";
  echo  "  " .$v["receive_id"]."     ";
  echo  "\n";
  echo  "";
 
  
  echo "\n";
  echo  "\n";
  echo  "  " .$v["dt_return"]."     ";
  echo  "\n";
  echo  "";

  echo "\n";
  echo  "\n";
  echo  "  " .$v["return_admin"]."     ";
  echo  "\n";
  echo  "";

  echo "\n";
  echo  "\n";
  echo  "  " .$v["return_by"]. "     ";
  echo  "\n";
  echo  "";
  
  echo "\n";
  echo  "\n";
  echo  "  " .$v["return_id"]."     ";
  echo  "\n";
  echo  "";
  
  /*echo "\n";
  echo  "\n";
  $now = time(); // or your date as well
    $your_date = strtotime($v["dt_issue"]);
    $datediff = $now - $your_date;

//echo round($datediff / (60 * 60 * 24));
    //echo $datediff->format('%R%a days');
  echo  "  " .round($datediff / (60 * 60 * 24))."     ";
  echo  "\n";
  echo  "";*/
  
  echo "\n";
    $now = time();
    $your_date = strtotime($v["dt_issue"]);
    $datediff = $now - $your_date;
    $daysDiff = round($datediff / (60 * 60 * 24));
    $color = $daysDiff < 3 ? '#3C5F84' : ($daysDiff <= 6 ? 'orange' : 'red');
    echo  "\n";
    echo  "  " .$daysDiff."     ";
    echo  "\n";
    echo  "";

  echo  "";
  
}

上面的代码是在 php 中我如何计算周期时间选项卡的。对于 dt_issue，它在插入查询时与 now() 一起使用。我将在下面插入屏幕截图。