将两个时间戳的差（秒）转化成字符串

比如“x分钟前”、“x小时前”

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<?php
/**
* 时间转换易读的文字
* @author   technofiend<2281551151@qq.com>
* https://blog.csdn.net/technofiend/article/details/78627161
*/
function time2Readability($time, $contrastTime = 0)
{
    if ($contrastTime <= 0) {
        $contrastTime = time();
    }

    if ($time <= 0) {
        return '未知';
    }

    // 非今年发布的时间
    if (date('Y', $time) != date('Y', $contrastTime)) {
        return date('Y-m-d H:i:s', $time);
    }

    // 发布时间的零点
    $dateTime1  = new \DateTime();
    $dateTime1->setTimestamp($time);
    $dateTime1->setTime(0, 0, 0);
    $time1      = $dateTime1->getTimestamp();

    // 今天的零点
    $todayObj   = new \DateTime();
    $todayObj->setTimestamp($contrastTime);
    $todayObj->setTime(0, 0, 0);
    $today      = $todayObj->getTimestamp();

    // 距离发表时间的秒数
    $elapseTime = $contrastTime - $time;

    // 发表时间等于今天
    if ($time1 == $today) {
        // 今天发表的
        if ($elapseTime <= 5 * 60) {
            // 5分钟内
            return '刚刚';
        } else if ($elapseTime <= 60 * 60) {
            // 一个钟头内
            return floor($elapseTime / 60) . ' 分钟前';
        } else {
            return floor($elapseTime / (60 * 60)) . ' 小时前';
        }
    }

    $dateTime3 = new \DateTime();
    $dateTime3->setTimestamp($contrastTime);
    $dateTime3->modify('-1 day');
    $dateTime3->setTime(0, 0, 0);
    $yesterday = $dateTime3->getTimestamp();

    // 发表时间等于昨天
    if ($time1 == $yesterday) {
        if (($contrastTime - 6 * 60 * 60) < $today) {
            // 如果当前时间是凌晨
            $hourBefore = floor($elapseTime / (60 * 60));
            if ($hourBefore <= 9) {
                return $hourBefore . ' 小时前';
            } else {
                return '昨天：' . date('H:i', $time);
            }
        } else {
            return '昨天：' . date('H:i', $time);
        }
    }

    return date('m-d H:i:s', $time);
}
?>
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$today = new DateTime();
$today->setTime(23, 0, 0);

$t     = new DateTime();
$t->modify('-1 year -1 day');
$t->setTime(1, 0, 0);

echo time2Readability($t->getTimestamp(), $today->getTimestamp());

参考：https://blog.csdn.net/technofiend/article/details/78627161