最高级别的时间差（年、月、日、时、分、秒） #php

timespan.php

/**
 * Timespan
 *
 * 返回最高级别的时间差（年、月、日、时、分、秒）
 *
 * @access    public
 * @param    integer    a number of seconds
 * @param    integer    Unix timestamp
 * @return    integer
 */
if (!function_exists('timespan')) {
    function timespan($seconds = 1, $time = '')
    {
        if (!is_numeric($seconds)) {
            $seconds = 1;
        }

        if (!is_numeric($time)) {
            $time = time();
        }

        if ($time <= $seconds) {
            $seconds = 1;
        } else {
            $seconds = $time - $seconds;
        }

        $str = '';
        $years = floor($seconds / 31536000);

        if ($years > 0) {
            $str .= $years . '年前 ';
            return $str;
        }

        $seconds -= $years * 31536000;
        $months = floor($seconds / 2628000);

        if ($years > 0 OR $months > 0) {
            if ($months > 0) {
                $str .= $months . '月前';
            }

            $seconds -= $months * 2628000;
            return $str;
        }

        $weeks = floor($seconds / 604800);

        if ($years > 0 OR $months > 0 OR $weeks > 0) {
            if ($weeks > 0) {
                $str .= $weeks . '周前';
            }

            $seconds -= $weeks * 604800;
            return $str;
        }

        $days = floor($seconds / 86400);

        if ($months > 0 OR $weeks > 0 OR $days > 0) {
            if ($days > 0) {
                $str .= $days . '天前';
            }

            $seconds -= $days * 86400;
            return $str;
        }

        $hours = floor($seconds / 3600);

        if ($days > 0 OR $hours > 0) {
            if ($hours > 0) {
                $str .= $hours . '小时前';
            }

            $seconds -= $hours * 3600;
            return $str;
        }

        $minutes = floor($seconds / 60);

        if ($days > 0 OR $hours > 0 OR $minutes > 0) {
            if ($minutes > 0) {
                $str .= $minutes . '分钟前';
            }

            $seconds -= $minutes * 60;
            return $str;
        }

        if ($str == '') {
            $str .= $seconds . '秒前';
        }

        return $str;
    }
}