php中将时间差转换为字符串提示的实现代码

如微博 
这看起来更加人性化，好吧，上代码 
 代码如下: 
class timeAgo
{
static $timeagoObject;
private $rustle;
private $unit;

private function __construct()
{

}
private function __clone(){ }
public static function getObject()
{
if(! (self::$timeagoObject instanceof self) )
self::$timeagoObject = new timeAgo();

return self::$timeagoObject;
}
private function count_int($unix_C) // main function
{
if(! (isset($unix_C) || is_numeric($unix_C)) )
return 'don\'t find parameter';

$d = time()-$unix_C ; // $d - unix time difference value
$d_int =(int)floor($d/60) ; // minimum unit -- minutes unix/60

$this->unit = 0 ; // is minutes,hour or day? 

if($d_int < 60){ // minutes in one hour 3600
$this->rustle = $d_int; 
$this->unit = 1; 
} 
else if($d_int < 720){ //hour in one day 3600*12
$this->rustle = floor($d_int/60); 
$this->unit = 2 ; 
} 
else if($d_int < 7200){ //day in ten days 3600*12*10
$this->rustle = floor($d_int/720); 
$this->unit = 3 ; 
} 
else{ 
$this->rustle = $d ; 
$this->unit = 4 ; 
} 
} 
public function piece_str($C) 
{ 
$this->count_int($C); 

$u = ''; 
switch( $this->unit ) 
{ 
case 1: 
$u = 'minute'; 
break; 
case 2: 
$u = 'hour'; 
break; 
case 3: 
$u = 'day'; 
break; 
case 4: 
$u = ''; 
break; 
case 0: 
return 'sorry , get time is fail'; 
} 
if($this->unit < 4)
{
if($this->rustle > 1) 
return (string)$this->rustle.$u.'s ago'; 
else if($this->rustle == 1) 
return (string)$this->rustle.$u.'ago'; 
else 
return 'Just now'; 
} 
} 
/* example: $ago = timeAgo::getObject(); 
* echo $ago->piece_str($unix); 
* // 2 days ago 
*/ 
} 
?>