php根据时间显示刚刚,几分钟前,几小时前的实现代码

<?php
/**
* php<a href="http://www.jbxue.com/zt/shijianzhuanhuan/" target="_blank" class="infotextkey">时间转换</a>
* edit by www.jbxue.com
*/
date_default_timezone_set('PRC');
$date = "1351836000";
echo tranTime($date);
          
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;
}          
?>