thinkphp增加每页显示条数的方法

return "<ul class=&#39;am-pagination am-pagination-right&#39;>{$page_str}</ul>
        <div class=&#39;am-dropdown  am-dropdown-up&#39; data-am-dropdown>
            <button class=&#39;am-btn am-btn-primary am-dropdown-toggle&#39; data-am-dropdown-toggle>显示条数 <span class=&#39;am-icon-caret-up&#39;></span></button>
            <ul class=&#39;am-dropdown-content&#39;>
                <li><a href=&#39;".$this->urlNum(null,1)."&#39;>10</a></li>
                <li><a href=&#39;".$this->urlNum(null,1)."&#39;>30</a></li>
                <li><a href=&#39;".$this->urlNum(null,1)."&#39;>50</a></li>
            </ul>
        </div>";

private function urlNum($num,$page){
    $str = str_replace(urlencode('[PAGE]'), $page, $this->url);
    return str_replace(urlencode('[NUM]'), $num,  $str);
}

<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2014 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: 麦当苗儿 <zuojiazi@vip.qq.com> <http://www.zjzit.cn>
// +----------------------------------------------------------------------
namespace Think;

class Page{
    public $firstRow; // 起始行数
    public $listRows; // 列表每页显示行数
    public $parameter; // 分页跳转时要带的参数
    public $totalRows; // 总行数
    public $totalPages; // 分页总页面数
    public $rollPage   = 11;// 分页栏每页显示的页数
    public $lastSuffix = true; // 最后一页是否显示总页数

    private $p       = &#39;p&#39;; //分页参数名
    private $num       = &#39;num&#39;; //分页参数名
    private $url     = &#39;&#39;; //当前链接URL
    private $nowPage = 1;
    // 分页显示定制
    private $config  = array(
        &#39;header&#39; => &#39;<span class="rows">共 %TOTAL_ROW% 条记录</span>&#39;,
        &#39;prev&#39;   => &#39;&laquo;&#39;,
        &#39;next&#39;   => &#39;&raquo;&#39;,
        &#39;first&#39;  => &#39;1...&#39;,
        &#39;last&#39;   => &#39;...%TOTAL_PAGE%&#39;,
        &#39;theme&#39;  => &#39;%HEADER% %FIRST% %UP_PAGE% %LINK_PAGE% %DOWN_PAGE% %END%&#39;,
    );

    /**
     * 架构函数
     * @param array $totalRows  总的记录数
     * @param array $listRows  每页显示记录数
     * @param array $parameter  分页跳转的参数
     */
    public function __construct($totalRows, $listRows=20, $parameter = array()) {
        C(&#39;VAR_PAGE&#39;) && $this->p = C(&#39;VAR_PAGE&#39;); //设置分页参数名称
        /* 基础设置 */
        $this->totalRows  = $totalRows; //设置总记录数
        $this->listRows   = $listRows;  //设置每页显示行数
        $this->parameter  = empty($parameter) ? $_GET : $parameter;
        $this->nowPage    = empty($_GET[$this->p]) ? 1 : intval($_GET[$this->p]);
        $this->nowPage    = $this->nowPage>0 ? $this->nowPage : 1;
        $this->firstRow   = $this->listRows * ($this->nowPage - 1);
    }

    /**
     * 定制分页链接设置
     * @param string $name  设置名称
     * @param string $value 设置值
     */
    public function setConfig($name,$value) {
        if(isset($this->config[$name])) {
            $this->config[$name] = $value;
        }
    }

    /**
     * 生成链接URL
     * @param  integer $page 页码
     * @return string
     */
    private function url($page){
        // return str_replace(urlencode(&#39;[PAGE]&#39;), $page, $this->url);
        $num = $_GET[&#39;num&#39;] ? $_GET[&#39;num&#39;] : &#39;10&#39;;
        $str = str_replace(urlencode(&#39;[NUM]&#39;), $num,   $this->url);
        return str_replace(urlencode(&#39;[PAGE]&#39;), $page, $str);
    }
    
    private function urlNum($num,$page){
        $str = str_replace(urlencode(&#39;[PAGE]&#39;), $page, $this->url);
        return str_replace(urlencode(&#39;[NUM]&#39;), $num,  $str);
    }
    /**
     * 组装分页链接
     * @return string
     */
    public function show() {
        if(0 == $this->totalRows) return &#39;&#39;;

        /* 生成URL */
        // echo $this->num;die;
        $this->parameter[$this->p] = &#39;[PAGE]&#39;; 
        // $num = empty($_GET[&#39;num&#39;]) ? &#39;20&#39; : &#39;&#39;;
        $this->parameter[$this->num] = &#39;[NUM]&#39;;
        $this->url = U(ACTION_NAME, $this->parameter);
        /* 计算分页信息 */
        $this->totalPages = ceil($this->totalRows / $this->listRows); //总页数
        if(!empty($this->totalPages) && $this->nowPage > $this->totalPages) {
            $this->nowPage = $this->totalPages;
        }

        /* 计算分页临时变量 */
        $now_cool_page      = $this->rollPage/2;
        $now_cool_page_ceil = ceil($now_cool_page);
        $this->lastSuffix && $this->config[&#39;last&#39;] = $this->totalPages;

        //上一页
        $up_row  = $this->nowPage - 1;
        $up_page = $up_row > 0 ? &#39;<li><a class="prev" href="&#39; . $this->url($up_row) . &#39;">&#39; . $this->config[&#39;prev&#39;] . &#39;</a></li>&#39; : &#39;&#39;;

        //下一页
        $down_row  = $this->nowPage + 1;
        $down_page = ($down_row <= $this->totalPages) ? &#39;<li><a class="next" href="&#39; . $this->url($down_row) . &#39;">&#39; . $this->config[&#39;next&#39;] . &#39;</a></li>&#39; : &#39;&#39;;

        //第一页
        $the_first = &#39;&#39;;
        if($this->totalPages > $this->rollPage && ($this->nowPage - $now_cool_page) >= 1){
            $the_first = &#39;<li><a class="first" href="&#39; . $this->url(1) . &#39;">&#39; . $this->config[&#39;first&#39;] . &#39;</a></li>&#39;;
        }

        //最后一页
        $the_end = &#39;&#39;;
        if($this->totalPages > $this->rollPage && ($this->nowPage + $now_cool_page) < $this->totalPages){
            $the_end = &#39;<li><a class="end" href="&#39; . $this->url($this->totalPages) . &#39;">&#39; . $this->config[&#39;last&#39;] . &#39;</a></li>&#39;;
        }

        //数字连接
        $link_page = "";
        for($i = 1; $i <= $this->rollPage; $i++){
            if(($this->nowPage - $now_cool_page) <= 0 ){
                $page = $i;
            }elseif(($this->nowPage + $now_cool_page - 1) >= $this->totalPages){
                $page = $this->totalPages - $this->rollPage + $i;
            }else{
                $page = $this->nowPage - $now_cool_page_ceil + $i;
            }
            if($page > 0 && $page != $this->nowPage){

                if($page <= $this->totalPages){
                    $link_page .= &#39;<li><a class="num" href="&#39; . $this->url($page) . &#39;">&#39; . $page . &#39;</a></li>&#39;;
                }else{
                    break;
                }
            }else{
                if($page > 0 && $this->totalPages != 1){
                    $link_page .= &#39;<li class="am-active"><a href="#">&#39; . $page . &#39;</a></li>&#39;;
                }
            }
        }

        //替换分页内容
        $page_str = str_replace(
            array(&#39;%HEADER%&#39;, &#39;%NOW_PAGE%&#39;, &#39;%UP_PAGE%&#39;, &#39;%DOWN_PAGE%&#39;, &#39;%FIRST%&#39;, &#39;%LINK_PAGE%&#39;, &#39;%END%&#39;, &#39;%TOTAL_ROW%&#39;, &#39;%TOTAL_PAGE%&#39;),
            array($this->config[&#39;header&#39;], $this->nowPage, $up_page, $down_page, $the_first, $link_page, $the_end, $this->totalRows, $this->totalPages),
            $this->config[&#39;theme&#39;]);
            return "<ul class=&#39;am-pagination am-pagination-right&#39;>{$page_str}</ul>
                    <div class=&#39;am-dropdown  am-dropdown-up&#39; data-am-dropdown>
                        <button class=&#39;am-btn am-btn-primary am-dropdown-toggle&#39; data-am-dropdown-toggle>显示条数 <span class=&#39;am-icon-caret-up&#39;></span></button>
                        <ul class=&#39;am-dropdown-content&#39;>
                            <li><a href=&#39;".$this->urlNum(null,1)."&#39;>10</a></li>
                            <li><a href=&#39;".$this->urlNum(null,1)."&#39;>30</a></li>
                            <li><a href=&#39;".$this->urlNum(null,1)."&#39;>50</a></li>
                        </ul>
                    </div>";
    }
}