Php 异常的原因，而不是处理它们，但我已经更新，以包括关于排除异常处理的说明。从OOP显示的代码中，$epoch是一个有效值数组。如果这些值是timestampints，是的，那是行不通的，我个人发现DateTime构造远不如其他DateTime方法灵活。谢谢！

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异常的原因，而不是处理它们，但我已经更新，以包括关于排除异常处理的说明。从OOP显示的代码中，

$epoch

是一个有效值数组。如果这些值是timestamp

int

s，是的，那是行不通的，我个人发现

DateTime

构造远不如其他DateTime方法灵活。谢谢！只是想让你知道，作者一直是。现在已删除的答案解决了问题，这导致OP现在遇到的时间戳数组出现问题。@fyrye再次感谢。我看到了你关于数组迭代的帖子，这是一个很好的解释，我不想对你的答案进行讨论，但我想对问题上显示的具体错误（仅）进行分类和澄清。很多关于SO的帖子都是OP问题的多米诺骨牌效应…@fyrye我已经对我的答案进行了大量修改。我还删除了关于时区的部分。干杯

// getting controller ap info //

    $name=$status=$uptime=$last_seen=[];
foreach ($ligowave->result as $index => $obj) {
    $name[]      = $obj->name;
    $status[]    = $obj->status;
    $uptime[]    = $obj->uptime;
    $last_seen[] = $obj->last_seen;
}


// time settings //

$epoch = $uptime;
$uptimetime = (new DateTime("@$epoch"))->format(' H:i:s');

$epoch = $last_seen;
$lastseendate = (new DateTime("@$epoch"))->SetTimeZone(new DateTimeZone('Europe/Amsterdam'))->format(' d-m-Y H:i:s');

if ($status == "up") {
    echo $name;
    echo " is up, ";
    echo "uptime is:" . $uptimetime;
} else {
    echo $name;
    echo " is down, ";
    echo "device is last seen:" . $lastseendate;
}
return array($name, $status, $epoch, $uptimetime, $lastseendate);
}

   //...

    // getting controller ap info //

        $values = [];
        foreach ($ligowave->result as $index => $obj) {
            //convert the unix timestamps to DateTime objects
            $uptime = (new DateTime('@' . $obj->uptime));
            $last_seen = (new DateTime('@' . $obj->last_seen))->setTimeZone(new DateTimeZone('Europe/Amsterdam'));

            //store the return values into an array
            $values[] = $value = [
                'name' => $obj->name,
                'status' => $obj->status,
                'uptimetime' => $uptime->format('H:i:s'),
                'lastseendate' => $last_seen->format('d-m-Y H:i:s')
            ];

            //output each of the statuses
            printf('%s is %s, ', $obj->name, $obj->status);
            if ('up' === $obj->status) {
                echo 'uptime is: ' . $value['uptimetime'];
            } else {
                echo 'device is last seen: ' . $value['lastseendate'];
            }
        }

        return $values;
}

foo is up, uptime is: 10:20:54
bar is down, device is last seen: 01-06-2019 08:22:30

array (
  0 => 
  array (
    'name' => 'foo',
    'status' => 'up',
    'uptimetime' => '10:20:54',
    'lastseendate' => '05-06-2019 11:16:21',
  ),
  1 => 
  array (
    'name' => 'bar',
    'status' => 'down',
    'uptimetime' => '10:20:54',
    'lastseendate' => '01-06-2019 08:22:30',
  ),
)

//...

$uptime = (new DateTime('@' . $obj->uptime))->setTimeZone(new DateTimeZone('Europe/Amsterdam'));
$last_seen = (new DateTime('@' . $obj->last_seen))->setTimeZone(new DateTimeZone('Europe/Amsterdam'));
$values[] = $value = [
    'name' => $obj->name,
    'status' => $obj->status,
    'lastseendate' => $last_seen->format('d-m-Y H:i:s'),
    'uptimetime' => $uptime->diff($last_seen)->format('%a.%H:%I:%S'), //DD.HH:MM:SS
];

//...

foo is up, uptime is: 12.22:48:26

$epoch = $uptime;

try{ 
     /***
      * Uptime appears to be a numeric array of time string values 
      * Therefore go for the first one. 
      * You may want to wrap this code in a loop to catch each one.  
      ***/
     $uptimeTime = new DateTime("@".(string)$epoch[0]);
}
catch (Exception $ex){
    /***
     * If you wish to ignore these errors simply leave this block empty
     ***/
    error_log("There was a problem on line ".__LINE__."! ".print_r($ex));
}
/***
 * By default UTC timestamps are not zoned.   
 ***/
// $uptimeTime->setTimeZone(new DateTimeZone('Europe/Amsterdam'));

$uptimeTimeOutput = $uptimeTime->format('H:i:s');
/***
 * $uptimeTimeOutput is the correctly formatted date from $epoch[0]
 ***/
 print $uptimeTimeOutput;