模仿C＃的StringBuilder类，还有很多函数需要慢慢完善的
以前写javascript的时候，有个js的Stringbuilder类，说是效率高，不知道在php下，这样处理字符串组合时不时也会效率高呢？请高手指点

<?
class StringBuilder
{
     const LINE="<br/>";
    protected $list= array('');

   
    public function __construct( $str=NULL)
    {
        array_push($this->list,$str);
   
    }
   
    public function Append($str)
    {
        array_push($this->list,$str);
        return $this;
    }

    public function AppendLine($str)
    {
        array_push($this->list,$str.self::LINE);
        return $this;
    }

    public function AppendFormat( $str,mixed $args)
    {
        array_push($this->list, sprintf($str,$args));
        return $this;
    }

    public function ToString()
    {
        return implode("",$this->list);
    }

    public function __destruct()
    {
        unset($this->list);
    }
}

$sb = new StringBuilder("create!");
$sb->Append("liangzhong")->Append("hua")->AppendLine("hello")->Append("test")
->Append("ok");
echo $sb->ToString();
?>