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);