建站之友好时间显示

public function format($time)
{
    if (invalid_integer($time)) {
        return '';
    }

    $now = time();
    $today = strtotime(date('Y-m-d', $now));

    $tmp = $now - $time;
    if (60 > $tmp) {
        return '刚刚';
    } elseif (3600 > $tmp) {
        return floor($tmp / 60) . ' 分钟前';
    } elseif (86400 > $tmp) {
        return floor($tmp / 3600) . ' 小时前';
    }

    $time = strtotime(date('Y-m-d', $time));

    foreach (['昨', '前'] as $k => $name) {
        if ($today - 86400 * (1 + $k) <= $time) {
            return $name . '天';
        }
    }

    $week = ['日', '一', '二', '三', '四', '五', '六'];
    $tmp = date('w', $now);
    0 == $tmp && $tmp = 7;
    $tmp = $today - 86400 * $tmp;

    foreach (['', '上'] as $k => $name) {
        if ($tmp - 86400 * 7 * $k < $time) {
            return $name . '周' . $week[date('w', $time)];
        }
    }

    if ($tmp - 86400 * 7 * 2 < $time) {
        return '3 周前';
    }

    $tmp = strtotime(date('Y-m-01', $now));
    if ($tmp <= $time) {
        return format_integer(($today - $time) / 86400) . ' 天前';
    }

    $tmp = strtotime(date('Y-m-01', $tmp - 1));
    if ($tmp <= $time) {
        return '上月';
    }

    $tmp = strtotime(date('Y-01-01', $now));
    if ($tmp <= $time) {
        return (date('n', $now) - date('n', $time)) . ' 月前';
    }

    foreach (['去', '前'] as $name) {
        $tmp = strtotime(date('Y-01-01', $tmp - 1));
        if ($tmp <= $time) {
            return $name . '年';
        }
    }

    return (date('Y', $now) - date('Y', $time)) . ' 年前';
}