php分页类

/*

        分页的CSS代码：使用要复制到相关CSS页面
        #data_page {
            width:100%;
            color:blue;
            line-height:30px;
        }
        
        #data_page span{
            color:red; font-weight:bold;    
        }
        
        #data_page .page_num,
        #data_page .current_page{
            width:12px;
            padding:3px 5px;
            line-height:10px;    
            border-left:1px solid #CCC;
            border-top:1px solid #CCC;
            border-right:1px solid #999;
            border-bottom:1px solid #666;
            margin:0px 2px;
        }
        
        #data_page .page_num:hover,
        #data_page .current_page{    
            border:1px inset #999;
            color:#333;
            text-decoration:none;
        }
        
        #data_page .current_page{
            background-color:#9CF;
        }

        分页类，
        在使用此分页类之前，必须在表单保证查询串的值不为空,如:?do=xx    
    */
    class Page{
        private $pageRecordNum = 10; //默认每页记录数为10条
        private $total=0; //总条数
        private $totalNum=0; //总页数
        private $p = 1;          //当前页
        private $np = 1;  //下一页
        private $rp = 1;  //上一页
        private $page = "page=";
        private $url;
        
        private $interval_page = 10; //根据该值限定一组分页的页码数
        
        public function setPageRecordNum($pageRecordNum){
            $this->pageRecordNum = $pageRecordNum;
        }
        
        public function getPageRecordTotal(){
            return $this->pageRecordNum*($this->p-1);
        }
        
        public function set($url,$total){
            $this->url = $url;
            $this->total = $total;
        }
        
        public function getPageRecordNum(){
            return $this->pageRecordNum;
        }
        
        public function getQueryRange(){
            $this->formatUrl();
            return " limit ".$this->getPageRecordTotal().",".$this->pageRecordNum;
        }
        
        private function formatUrl(){ // 先提取page的值,在将其值赋予np或者rp
            $total = $this->getTotalNum();
            if(isset($_GET['page']))
                $this->p = $_GET['page'];
            if($total > 1){
                if($this->p-1 < 1){
                    $this->rp = 1;
                }else{
                    $this->rp = $this->p-1;
                }
                if($this->p+1 > $total){
                    $this->np = $total;
                }else{
                    $this->np = $this->p+1;
                }
                $replace_url = parse_url($this->url);
                if(isset($replace_url["query"])){
                    $query_url = $replace_url["query"];
                    $nu = @ereg_replace("(^|&)page=$this->p","",$query_url);
                    $this->url = @ereg_replace($query_url,"",$this->url);
                    $this->url .= (!$nu) ? "" : $nu."&";
                }else{
                    $this->page = "?".$this->page;
                }
            }
        }
        
        public function display(){
            $total = $this->getTotalNum();
            if($total > 1){
                $r = $this->page.$this->rp;
                $n = $this->page.$this->np;
                $u  = $this->url.$this->page; 
                $page = "<div id='data_page'>".
                        "总计<span>{$this->total}</span>条记录&nbsp;共<span>{$total}</span>页&nbsp;&nbsp;";
                if($this->p - $this->interval_page >= 1)
                    $page .=    "<a href='{$this->url}{$r}' style='margin-right:5px;' class='page_num' title='上一页'>&lt;</a>";    
                $base = ceil($this->p / $this->interval_page);
                $begin_base = $base * $this->interval_page - ($this->interval_page-1);
                if($begin_base < 1)
                    $begin_base = 1;    
                $end_base = $begin_base + $this->interval_page - 1;
                if($end_base > $total){
                    $end_base = $total;
                }
                for(; $begin_base<=$end_base; $begin_base++){
                    $className = ($begin_base == $this->p ? 'current_page' : 'page_num');
                    if($this->p == $begin_base){
                        $page .= "<span class='{$className}'>{$begin_base}</span>";                
                    }else{
                        $page .= "<a href='{$u}{$begin_base}' class='{$className}'>{$begin_base}</a>";
                    }
                }
                if($base * $this->interval_page < $total)
                    $page .= "<a href='{$this->url}{$n}' style='margin-left:5px;' class='page_num' title='下一页'>&gt;</a>";
                $page .= "</div>";
                $this->url = $this->url.$this->page.$this->p;
            }else{
                $page = "<div style='width:100%;color:blue; line-height:30px;'>总计<span style='color:red;font-weight:bold;'>&nbsp;{$this->total}&nbsp;</span>条记录</div>";
            }
            return $page;
        }
        
        private function countRecord(){
            $p = $this->p == 1 ? 0 : $this->p;
            return $this->p*$this->pageRecordNum-($this->pageRecordNum-1);
        }
        
        public function getTotalNum(){
            $page = ceil($this->total/$this->pageRecordNum);
            return (int)$page;
        }
        
        public function getURL(){
            return $this->url;
        }
        
        //用于在分页时生成get查询参数
        //$arr 分页时根据该值生成相应的url参数 k=>v形式
        public function str_link($arr=array()){
            $url = parse_url($_SERVER['REQUEST_URI']);
            $query = isset($url["query"]) ? $url["query"] : "?";
            $param = "";
            if($query != "?"){
                $_SERVER['REQUEST_URI'] = str_replace($query,"",$_SERVER['REQUEST_URI']);
            }else{
                $_SERVER['REQUEST_URI'] .= "?";    
            }
            foreach($arr AS $key=>$value){
                if(!empty($value)){
                    $value = urlencode($value);
                    $param .= "$key=$value&";
                }
            }
            $query = rtrim($param,"&");
            if(!preg_match("/".substr($query,1,strlen($query))."/",$_SERVER['REQUEST_URI'])){
               $_SERVER['REQUEST_URI'] .= $query; 
            }        
            return "http://".$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
       }
   }