Php 尝试从非对象中减去时出错

我试图得到数据库在给定时间段内打开和关闭时的总差异（以分钟为单位）。当我的数据库包含的打开时间多于关闭时间时，或者反之亦然，我会得到一个错误，因为它试图从一个不存在的关闭时间中减去一个打开时间。我做错了什么？有没有办法忽略没有匹配的剩余时间

PHP

当我试着用这个从开始的时间中减去结束的时间

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您对$closing\u time和$opening\u time使用相同的迭代器，但仅基于$closing\u time的计数。你能保证它们有相同数量的元素吗？不，就是这样，有时候它们没有相同数量的元素，我不知道如何设置，这样在发生这种情况时就不会出错。你可以使用isset（）检查并默认为

isset（$closing_time[$x]）$结束时间[$x]：0

另外，如果您的日志日期<'to'u date'不是日志日期，我将尝试设置，但对于日志日期，我不希望在当前日期中包含任何内容

$closing = "SELECT log_time FROM log_table WHERE database_name = '$d' AND server_protocol = '98' AND log_date >= '$from_date' AND log_date < '$to_date' ORDER BY log_date DESC, log_time DESC";
 $query = $this->db->prepare($closing);
 $query->execute();
 $closing_time = $query->fetchAll();

 $opening = "SELECT log_time FROM log_table WHERE database_name = '$d' AND server_protocol = '94' AND log_date >= '$from_date' AND log_date < '$to_date' ORDER BY log_date DESC, log_time DESC";
 $query = $this->db->prepare($opening);
 $query->execute();
 $opening_time = $query->fetchAll();

foreach ($opening_time as $o) {
     print "<pre>";
     print "------OPENING TIME -----";
     print_r($o);
     print "</pre>";
     }
foreach ($closing_time as $c) {
     print "<pre>";
     print "------CLOSING TIME -----";
     print_r($c);
     print "</pre>";
     }

FMServer_Sample
------OPENING TIME -----stdClass Object
(
    [log_time] => 14:42:51
)
 ------OPENING TIME -----stdClass Object
(
    [log_time] => 13:24:36
)
------OPENING TIME -----stdClass Object
(
     [log_time] => 10:19:58
)
------CLOSING TIME -----stdClass Object
(
     [log_time] => 15:02:21
)
------CLOSING TIME -----stdClass Object
(
     [log_time] => 14:54:21
)
------CLOSING TIME -----stdClass Object
(
    [log_time] => 14:20:25
)
------CLOSING TIME -----stdClass Object
(
    [log_time] => 12:08:04
)

iCDS
------OPENING TIME -----stdClass Object
(
    [log_time] => 14:40:00
)
 ------OPENING TIME -----stdClass Object
(
    [log_time] => 13:00:00
)
------CLOSING TIME -----stdClass Object
(
     [log_time] => 14:50:00
)
------CLOSING TIME -----stdClass Object
(
     [log_time] => 13:10:00
)

$result = 0;
for ($x = 0; $x < count($closing_time); $x++) {
     if ($closing_time != "" && $opening_time != "") {
           $result += (strtotime($closing_time[$x]->log_time) -strtotime($opening_time[$x]->log_time));
      }
}
$result = round($result / 60);

Notice: Undefined offset 19
Notice: Trying to get property of non-object

iCDS 23377537 //should be 20