注意函数transfer_time()中的参数$time必须为Unix时间戳，如果不是请先用strtotime()将其转换成Unix时间戳

<?php

date_default_timezone_set('PRC');
$date = "1351836000";
echo tranTime($date);

function transfer_time($time)
{
    $rtime = date("m-d H:i",$time);
    $htime = date("H:i",$time);

    $time = time() - $time;

    if ($time < 60)
    {
        $str = '刚刚';
    }
    elseif ($time < 60 * 60)
    {
        $min = floor($time/60);
        $str = $min.'分钟前';
    }
    elseif ($time < 60 * 60 * 24)
    {
        $h = floor($time/(60*60));
        $str = $h.'小时前 '.$htime;
    }
    elseif ($time < 60 * 60 * 24 * 3)
    {
        $d = floor($time/(60*60*24));
        if($d==1)
            $str = '昨天 '.$rtime;
        else
            $str = '前天 '.$rtime;
    }
    else
    {
        $str = $rtime;
    }
    return $str;
}

?>