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如何在PHP中减去microtime并以毫秒显示日期?

作者:互联网

如何在PHP中减去microtime并以毫秒显示日期?

例如:我已设置结束日期和时间

$endtime = 2012-02-21 10:29:59;

然后我有当前日期或开始日期与微量时间转换

$starttime = 2012-02-21 10:27:59.452;

function getTimestamp()
{
        $microtime = floatval(substr((string)microtime(), 1, 8));
        $rounded = round($microtime, 3);
        return date("Y-m-d H:i:s") . substr((string)$rounded, 1, strlen($rounded));
}

echo getTimestamp(); //sample output 2012-02-21 10:27:59.452

现在我想减去:
$finaldate = $endtime – $starttime;

我希望我的输出是这样的:00:00:02.452

解决方法:

您需要使用microtime作为开始/结束值,并且只将其格式化以便在结尾显示.

// Get the start time in microseconds, as a float value
$starttime = microtime(true);

/************/
/* Do stuff */
/************/

// Get the difference between start and end in microseconds, as a float value
$diff = microtime(true) - $starttime;

// Break the difference into seconds and microseconds
$sec = intval($diff);
$micro = $diff - $sec;

// Format the result as you want it
// $final will contain something like "00:00:02.452"
$final = strftime('%T', mktime(0, 0, $sec)) . str_replace('0.', '.', sprintf('%.3f', $micro));

注意:这是从microtime返回浮点值并使用浮点运算来简化数学运算,因此浮动舍入问题可能导致您的数字略微偏离,但您最终将结果舍入为3位数,并且有轻微的波动在处理器时序中,无论如何都要大于浮点错误,所以这对你来说不是多个问题.

标签:php,microtime
来源: https://codeday.me/bug/20190929/1830359.html