php 人性化显示时间

//时间转换函数(把时间显示人性化)
function tranTime($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;
}
$times=time()-254;
echo tranTime($times);