到目前为止的strtotime返回false

Question

我有这组unix时间戳：

1. 1473804000 1471831200

我无法以此格式('Y-m-d H:i:s')为每个unix时间戳分配日期。

我的代码：

$eventhour = '1473804000';
$client = array(
                'pt' => $pt,
                'eventhour' => date('Y-m-d H:i:s', $eventhour),
                'activepower' => $avg['system.avg(activepower)']
            );

eventhour键为空，我猜函数date返回false。 unix时间戳是有效的，为什么它返回false？

我的循环代码

foreach ($result as $row):
        $pt = $row['pt'];

        $statement = new \Cassandra\SimpleStatement("select avg(activepower) FROM datavalue_test_by_hour WHERE pt= :pt AND eventhour = :eventhour;");
        $options = new \Cassandra\ExecutionOptions(
            array('arguments' => array('pt' => $pt, 'eventhour' => $row['eventhour'])))
        ;
        $data = $this->cassandra->executeWithOptions($statement, $options);
        $eventhour = $row['eventhour'];
        echo $eventhour . PHP_EOL;
        $avg = $data->first();
        $client = array(
            'pt' => $pt,
            'eventhour' => date('Y-m-d H:i:s', $eventhour),
            'activepower' => $avg['system.avg(activepower)']
        );
        print_r($client);
        //fputcsv($fp, $client);
    endforeach;

我的print_r（）：

1462554000
Array
(
    [pt] => AFH0AEFB0BFDEI
    [eventhour] => 
    [activepower] => 0.02475
)
1474887600
Array
(
    [pt] => A0A0AEAF0DI0H0
    [eventhour] => 
    [activepower] => 0.1115
)
1475244000
Array
(
    [pt] => AFH0ADE0AB0GDI
    [eventhour] => 
    [activepower] => 0.0905
)
1473008400
Array
(
    [pt] => A0A0AEAF0GDFHB
    [eventhour] => 
    [activepower] => 0.014
)
1470693600
Array
(
    [pt] => AFH0AEE00AF0FG
    [eventhour] => 
    [activepower] => 0.051
)
1452200400
Array
(
    [pt] => AFH0AEE00BACIC
    [eventhour] => 
    [activepower] => 0.152
)
1463637600
Array
(
    [pt] => AFH0ACFB00CD0F
    [eventhour] => 
    [activepower] => 0.041
)

Answer 1

我通过将返回的$row['eventhour']从数据库转换为 INT 来解决了这个问题。

$eventhour = (int) $row['eventhour'];

现在正在工作。