ThinkPHP分页类的使用相关问题，thinkphp分页

ThinkPHP分页类的使用相关问题，thinkphp分页

ThinkPHP3.2.3<span>
Page</span>.<span>class</span>.<span>php文件源码

</span><?<span>php
</span><span>//</span><span> +----------------------------------------------------------------------
// | 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>
// +----------------------------------------------------------------------</span>
<span>namespace Think;

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

    <span>private</span> <span>$p</span>       = 'p'; <span>//</span><span>分页参数名</span>
    <span>private</span> <span>$url</span>     = ''; <span>//</span><span>当前链接URL</span>
    <span>private</span> <span>$nowPage</span> = 1<span>;

    </span><span>//</span><span> 分页显示定制</span>
    <span>private</span> <span>$config</span>  = <span>array</span><span>(
        </span>'header' => '<span class="rows">共 %TOTAL_ROW% 条记录</span>',
        'prev'   => '<<',
        'next'   => '>>',
        'first'  => '1...',
        'last'   => '...%TOTAL_PAGE%',
        'theme'  => '%FIRST% %UP_PAGE% %LINK_PAGE% %DOWN_PAGE% %END%',<span>
    );

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

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

    </span><span>/*</span><span>*
     * 生成链接URL
     * @param  integer $page 页码
     * @return string
     </span><span>*/</span>
    <span>private</span> <span>function</span> url(<span>$page</span><span>){
        </span><span>return</span> <span>str_replace</span>(<span>urlencode</span>('[PAGE]'), <span>$page</span>, <span>$this</span>-><span>url);
    }

    </span><span>/*</span><span>*
     * 组装分页链接
     * @return string
     </span><span>*/</span>
    <span>public</span> <span>function</span><span> show() {
        </span><span>if</span>(0 == <span>$this</span>->totalRows) <span>return</span> ''<span>;

        </span><span>/*</span><span> 生成URL </span><span>*/</span>
        <span>$this</span>->parameter[<span>$this</span>->p] = '[PAGE]'<span>;
        </span><span>$this</span>->url = U(ACTION_NAME, <span>$this</span>-><span>parameter);
        </span><span>/*</span><span> 计算分页信息 </span><span>*/</span>
        <span>$this</span>->totalPages = <span>ceil</span>(<span>$this</span>->totalRows / <span>$this</span>->listRows); <span>//</span><span>总页数</span>
        <span>if</span>(!<span>empty</span>(<span>$this</span>->totalPages) && <span>$this</span>->nowPage > <span>$this</span>-><span>totalPages) {
            </span><span>$this</span>->nowPage = <span>$this</span>-><span>totalPages;
        }

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

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

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

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

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

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

                </span><span>if</span>(<span>$page</span> <= <span>$this</span>-><span>totalPages){
                    </span><span>$link_page</span> .= '<a class="num" href="' . <span>$this</span>->url(<span>$page</span>) . '">' . <span>$page</span> . '</a>'<span>;
                }</span><span>else</span><span>{
                    </span><span>break</span><span>;
                }
            }</span><span>else</span><span>{
                </span><span>if</span>(<span>$page</span> > 0 && <span>$this</span>->totalPages != 1<span>){
                    </span><span>$link_page</span> .= '<span class="current">' . <span>$page</span> . '</span>'<span>;
                }
            }
        }

        </span><span>//</span><span>替换分页内容</span>
        <span>$page_str</span> = <span>str_replace</span><span>(
            </span><span>array</span>('%HEADER%', '%NOW_PAGE%', '%UP_PAGE%', '%DOWN_PAGE%', '%FIRST%', '%LINK_PAGE%', '%END%', '%TOTAL_ROW%', '%TOTAL_PAGE%'),
            <span>array</span>(<span>$this</span>->config['header'], <span>$this</span>->nowPage, <span>$up_page</span>, <span>$down_page</span>, <span>$the_first</span>, <span>$link_page</span>, <span>$the_end</span>, <span>$this</span>->totalRows, <span>$this</span>->totalPages),
            <span>$this</span>->config['theme'<span>]);
        </span><span>return</span> "<div>{<span>$page_str</span>}</div>"<span>;
    }
}</span>

通常在数据查询后都会对数据集进行分页操作，ThinkPHP也提供了分页类来对数据分页提供支持。 下面是数据分页的两种示例。

第一种：利用Page类和limit方法

<span>$User</span> = M('User'); <span>//</span><span> 实例化User对象</span>
<span>$count</span>      = <span>$User</span>->where('status=1')-><span>count</span>();<span>//</span><span> 查询满足要求的总记录数</span>
<span>$Page</span>       = <span>new</span> \Think\Page(<span>$count</span>,25);<span>//</span><span> 实例化分页类 传入总记录数和每页显示的记录数(25)</span>
<span>$show</span>       = <span>$Page</span>->show();<span>//</span><span> 分页显示输出
// 进行分页数据查询 注意limit方法的参数要使用Page类的属性</span>
<span>$list</span> = <span>$User</span>->where('status=1')->order('create_time')->limit(<span>$Page</span>->firstRow.','.<span>$Page</span>->listRows)-><span>select();
</span><span>$this</span>->assign('list',<span>$list</span>);<span>//</span><span> 赋值数据集</span>
<span>$this</span>->assign('page',<span>$show</span>);<span>//</span><span> 赋值分页输出</span>
<span>$this</span>->display(); <span>//</span><span> 输出模板</span>

第二种：分页类和page方法的实现

<span>$User</span> = M('User'); <span>//</span><span> 实例化User对象
// 进行分页数据查询 注意page方法的参数的前面部分是当前的页数使用 $_GET[p]获取</span>
<span>$list</span> = <span>$User</span>->where('status=1')->order('create_time')->page(<span>$_GET</span>['p'].',25')-><span>select();
</span><span>$this</span>->assign('list',<span>$list</span>);<span>//</span><span> 赋值数据集</span>
<span>$count</span>      = <span>$User</span>->where('status=1')-><span>count</span>();<span>//</span><span> 查询满足要求的总记录数</span>
<span>$Page</span>       = <span>new</span> \Think\Page(<span>$count</span>,25);<span>//</span><span> 实例化分页类 传入总记录数和每页显示的记录数</span>
<span>$show</span>       = <span>$Page</span>->show();<span>//</span><span> 分页显示输出</span>
<span>$this</span>->assign('page',<span>$show</span>);<span>//</span><span> 赋值分页输出</span>
<span>$this</span>->display(); <span>//</span><span> 输出模板</span>

带入查询条件
如果是POST方式查询，如何确保分页之后能够保持原先的查询条件呢，我们可以给分页类传入参数，方法是给分页类的parameter属性赋值

<span>$count</span>      = <span>$User</span>->where(<span>$map</span>)-><span>count</span>();<span>//</span><span> 查询满足要求的总记录数</span>
<span>$Page</span>       = <span>new</span> \Think\Page(<span>$count</span>,25);<span>//</span><span> 实例化分页类 传入总记录数和每页显示的记录数
//分页跳转的时候保证查询条件</span>
<span>foreach</span>(<span>$map</span> <span>as</span> <span>$key</span>=><span>$val</span><span>) {
    </span><span>$Page</span>->parameter[<span>$key</span>]   =   <span>urlencode</span>(<span>$val</span><span>);
}
</span><span>$show</span>       = <span>$Page</span>->show();<span>//</span><span> 分页显示输出</span>

分页样式定制
我们可以对输出的分页样式进行定制，分页类Page提供了一个setConfig方法来修改默认的一些设置。例如：

<span>$page</span>->setConfig('header','<li class="rows">共<b>%TOTAL_ROW%</b>条记录  第<b>%NOW_PAGE%</b>页/共<b>%TOTAL_PAGE%</b>页</li>'<span>);
            </span><span>$page</span>->setConfig('prev', '上一页'<span>);
            </span><span>$page</span>->setConfig('next', '下一页'<span>);
            </span><span>$page</span>->setConfig('first', '首页'<span>);
            </span><span>$page</span>->setConfig('last', '尾页'<span>);    
            </span><span>$page</span>->setConfig('theme', '%FIRST% %UP_PAGE% %LINK_PAGE% %DOWN_PAGE% %END% %HEADER%');

setConfig方法支持的属性包括：
header：头部描述信息，默认值 “共 %TOTAL_ROW% 条记录”
next：下一页描述信息，默认值 “>>”
first：第一页描述信息，默认值 “1…”
last：最后一页描述信息，默认值 “…%TOTAL_PAGE%”
theme ：分页主题描述信息，包括了上面所有元素的组合 ，设置该属性可以改变分页的各个单元的显示位置，默认值是 “%FIRST% %UP_PAGE% %LINK_PAGE% %DOWN_PAGE% %END%”

其中，显示位置的对应的关系为：
位置 说明
%FIRST% 表示第一页的链接显示
%UP_PAGE% 表示上一页的链接显示
%LINK_PAGE% 表示分页的链接显示
%DOWN_PAGE% 表示下一页的链接显示
%END% 表示最后一页的链接显示
除了改变显示信息外，你还可以使用样式来定义分页的显示效果。 这些样式class包括：first（第一页）、prev（上一页）、next（下一页）、end（最后一页）、num（其他页的数字）、current（当前页）。

ThinkPHP系统分页类写的已经很完善只要花几分钟时间研究一下源代码即可，官方注释也很清晰。这里注解一下使用中的问题。系统默认设置了

<code class="hljs cs has-numbering"><span class="hljs-keyword">public $rollPage   = <span class="hljs-number">11;<span class="hljs-comment">// 分页栏每页显示的页数
<span class="hljs-keyword">public $lastSuffix = <span class="hljs-keyword">true; <span class="hljs-comment">// 最后一页是否显示总页数</span></span></span></span></span></span></code><br><br>

　　一开始看注释还不是很清楚，其实第一个参数是控制显示多少页数，如果默认显示11个页码一般太长，个人喜欢设置为5，当然修改这些参数不要在系统源文件中修改，而是在使用的时候设置$page->rollPage=5即可。

　　而第二个参数就比较坑人了，我们在个性化分页显示的时候通常会采用setConfig('last','尾页')； 用来设置最后一页显示为“尾页”，但是在show方法中可以看到tp在$this->lastSuffix 为真的时候重置该$this->config['last']的值为总页数这样导致无论你怎么设置最后一业都显示为数字。也不知道官方为什么这么设置，解决办法依然是重新设置$page->lastSuffix = false; 即可。