开头先引述下qq等级的算法：
设当前等级为n，达到当前等级最少需要的活跃天数为d，当前活跃天数为dc，升级剩余天数为dr，则：
从而推出:
好了，引述完成，懒得写字了，贴出代码：
复制内容到剪贴板
代码:mimage1 = $pimage1;
        $this->mimage2 = $pimage2;
        $this->mimage3 = $pimage3;
    }
/**
     * 根据活跃天数计算用户等级。(模仿qq的升级方式)
     * @return int
     * @access public
     */
    function get_rank($pscore) {
        $temp = $pscore+4;
        $trank = sqrt($temp)-2;
        $trank = floor($trank);
        return $trank;
    }
/**
     * 用户等级标志,根据用户等级显示用户标志
     * 仿照qq等级的四进制显示
     * @return str
     * @access public
     */
    function get_score($pscore) {
        $str = '';
        $trank = $this->get_rank($pscore);//根据分数取得等级
        $tpicnum = base_convert($trank,10,4);//转化为四进制
        $tpicnum = strrev($tpicnum);//翻转字符串
        $tarray = str_split($tpicnum);//转化为数组
        $tnum = count($tarray);
        if($tnum            for($i=$tnum-1;$i>=0;$i--){
                switch($i){
                    case '0':
                        for($j=0;$j                            $str .= $this->mimage1;
                        }
                    break;
                    case '1':
                        for($j=0;$j                            $str .= $this->mimage2;
                        }
                    break;
                    case '2':
                        for($j=0;$j                            $str .= $this->mimage3;
                        }
                    break;
                    default:
                        //$str = ;
                    break;
                }
            }
        }else {
            $str =     $this->mimage3.$this->mimage3.$this->mimage3.$this->mimage3;
        }
        return $str;
    }
}
?>以上就是显示类，再来个简单的调用实例： 复制内容到剪贴板
代码:get_score($tscore);
//输出显示效果
print ''.$echo.'
';
?>