function moban5_time($tm, $num) {
    if ($num == 1) {
        $tm = strtotime($tm);
    }
    $cur_tm = time();
    $dif = $cur_tm - $tm;
    $pds = array('秒', '分钟', '小时', '天', '周', '个月', '年');
    $lngh = array(1, 60, 3600, 86400, 604800, 2630880, 31570560);
    for ($v = sizeof($lngh) - 1; ($v >= 0) && (($no = $dif / $lngh[$v]) <= 1); $v--) {
        if ($v < 0) $v = 0;
    }
    $_tm = $cur_tm - ($dif % $lngh[$v]);
    $no = floor($no);
    $x = sprintf("%d%s", $no, $pds[$v]);
    return $x . "前";
}

列表内容页调用

'.moban5_time($r[newstime], 0).'

<?=moban5_time($navinfor[newstime], 0)?>