我需要根据商店的营业时间加上偏移量来生成交货时间。正确生成了开放时间，并且正确生成了偏移量，但我似乎无法正确组合它们。我已经尝试了几种方法：
$open = array('open_hr' => 14, 'open_min' => 0);
$tmpTime = mktime($open['open_hr'], $open['open_min']);
$openTime = date('G:i', $tmpTime);
$tmpOffset = 90; //in minutes
$tmpOpenWithOffset = $tmpTime + $tmpOffset * 60;
$finalTime = date('G:1', $tmpOpenWithOffset);
echo "open time: " . $openTime . "; offset in minutes: " .$tmpOffset . "; final time: " .$finalTime;
结果是：
开放时间：14:00；以分钟为单位的偏移量：90；最后时间：15:1
我预计将 90 分钟添加到 14:00 将导致 15:30。
我也试过这样：
$open = array('open_hr' => 14, 'open_min' => 0);
$tmpTime = mktime($open['open_hr'], $open['open_min']);
$openTime = date('G:i', $tmpTime);
$tmpOffset = 90;
$finalTime = strtotime('+'.$tmpOffset . ' minutes', $openTime);
echo "open time: " . $openTime . "; offset in minutes: " .$tmpOffset . "; final time: " .$finalTime;
这导致：
open time: 14:00; offset in minutes: 90; final time: 5414
我也尝试过使用eval来评估 的第一个参数strtotime，如下所示：
$open = array('open_hr' => 14, 'open_min' => 0);
$tmpTime = mktime($open['open_hr'], $open['open_min']);
$openTime = date('G:i', $tmpTime);
$tmpOffset = 90;
$tmpStr = eval('+'.$tmpOffset . ' minutes');
$finalTime = strtotime($tmpStr, $openTime);
echo "open time: " . $openTime . "; offset in minutes: " .$tmpOffset . "; final time: " .$finalTime;
这导致：
Parse error: syntax error, unexpected $end in /t.php(7) : eval()'d code on line 1
open time: 14:00; offset in minutes: 90; final time:
同样，期望的结果是 14:00 加上 90 分钟将返回 15:30。我在这里做错了什么？