ThinkPHP分頁類的使用相關(guān)問題，thinkphp分頁

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

</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: 麥當(dāng)苗兒 <zuojiazi@vip.qq.com> <http://www.zjzit.cn>
// +----------------------------------------------------------------------</span>
<span>namespace Think;

</span><span>class</span><span> Page{
    </span><span>public</span> <span>$firstRow</span>; <span>//</span><span> 起始行數(shù)</span>
    <span>public</span> <span>$listRows</span>; <span>//</span><span> 列表每頁顯示行數(shù)</span>
    <span>public</span> <span>$parameter</span>; <span>//</span><span> 分頁跳轉(zhuǎn)時要帶的參數(shù)</span>
    <span>public</span> <span>$totalRows</span>; <span>//</span><span> 總行數(shù)</span>
    <span>public</span> <span>$totalPages</span>; <span>//</span><span> 分頁總頁面數(shù)</span>
    <span>public</span> <span>$rollPage</span>   = 11;<span>//</span><span> 分頁欄每頁顯示的頁數(shù)</span>
    <span>public</span> <span>$lastSuffix</span> = <span>true</span>; <span>//</span><span> 最后一頁是否顯示總頁數(shù)</span>

    <span>private</span> <span>$p</span>       = 'p'; <span>//</span><span>分頁參數(shù)名</span>
    <span>private</span> <span>$url</span>     = ''; <span>//</span><span>當(dāng)前鏈接URL</span>
    <span>private</span> <span>$nowPage</span> = 1<span>;

    </span><span>//</span><span> 分頁顯示定制</span>
    <span>private</span> <span>$config</span>  = <span>array</span><span>(
        </span>'header' => '<span class="rows">共 %TOTAL_ROW% 條記錄</span>',
        'prev'   => '<<',
        'next'   => '>>',
        'first'  => '1...',
        'last'   => '...%TOTAL_PAGE%',
        'theme'  => '%FIRST% %UP_PAGE% %LINK_PAGE% %DOWN_PAGE% %END%',<span>
    );

    </span><span>/*</span><span>*
     * 架構(gòu)函數(shù)
     * @param array $totalRows  總的記錄數(shù)
     * @param array $listRows  每頁顯示記錄數(shù)
     * @param array $parameter  分頁跳轉(zhuǎn)的參數(shù)
     </span><span>*/</span>
    <span>public</span> <span>function</span> __construct(<span>$totalRows</span>, <span>$listRows</span>=20, <span>$parameter</span> = <span>array</span><span>()) {
        C(</span>'VAR_PAGE') && <span>$this</span>->p = C('VAR_PAGE'); <span>//</span><span>設(shè)置分頁參數(shù)名稱</span>
        <span>/*</span><span> 基礎(chǔ)設(shè)置 </span><span>*/</span>
        <span>$this</span>->totalRows  = <span>$totalRows</span>; <span>//</span><span>設(shè)置總記錄數(shù)</span>
        <span>$this</span>->listRows   = <span>$listRows</span>;  <span>//</span><span>設(shè)置每頁顯示行數(shù)</span>
        <span>$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>*
     * 定制分頁鏈接設(shè)置
     * @param string $name  設(shè)置名稱
     * @param string $value 設(shè)置值
     </span><span>*/</span>
    <span>public</span> <span>function</span> setConfig(<span>$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>*
     * 生成鏈接URL
     * @param  integer $page 頁碼
     * @return string
     </span><span>*/</span>
    <span>private</span> <span>function</span> url(<span>$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>*
     * 組裝分頁鏈接
     * @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> 計算分頁信息 </span><span>*/</span>
        <span>$this</span>->totalPages = <span>ceil</span>(<span>$this</span>->totalRows / <span>$this</span>->listRows); <span>//</span><span>總頁數(shù)</span>
        <span>if</span>(!<span>empty</span>(<span>$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> 計算分頁臨時變量 </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>上一頁</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>下一頁</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>第一頁</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>最后一頁</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>數(shù)字連接</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>替換分頁內(nèi)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>

通常在數(shù)據(jù)查詢后都會對數(shù)據(jù)集進行分頁操作，ThinkPHP也提供了分頁類來對數(shù)據(jù)分頁提供支持。 下面是數(shù)據(jù)分頁的兩種示例。

第一種：利用Page類和limit方法

<span>$User</span> = M('User'); <span>//</span><span> 實例化User對象</span>
<span>$count</span>      = <span>$User</span>->where('status=1')-><span>count</span>();<span>//</span><span> 查詢滿足要求的總記錄數(shù)</span>
<span>$Page</span>       = <span>new</span> \Think\Page(<span>$count</span>,25);<span>//</span><span> 實例化分頁類 傳入總記錄數(shù)和每頁顯示的記錄數(shù)(25)</span>
<span>$show</span>       = <span>$Page</span>->show();<span>//</span><span> 分頁顯示輸出
// 進行分頁數(shù)據(jù)查詢 注意limit方法的參數(shù)要使用Page類的屬性</span>
<span>$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>$list</span>);<span>//</span><span> 賦值數(shù)據(jù)集</span>
<span>$this</span>->assign('page',<span>$show</span>);<span>//</span><span> 賦值分頁輸出</span>
<span>$this</span>->display(); <span>//</span><span> 輸出模板</span>

第二種：分頁類和page方法的實現(xiàn)

<span>$User</span> = M('User'); <span>//</span><span> 實例化User對象
// 進行分頁數(shù)據(jù)查詢 注意page方法的參數(shù)的前面部分是當(dāng)前的頁數(shù)使用 $_GET[p]獲取</span>
<span>$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> 賦值數(shù)據(jù)集</span>
<span>$count</span>      = <span>$User</span>->where('status=1')-><span>count</span>();<span>//</span><span> 查詢滿足要求的總記錄數(shù)</span>
<span>$Page</span>       = <span>new</span> \Think\Page(<span>$count</span>,25);<span>//</span><span> 實例化分頁類 傳入總記錄數(shù)和每頁顯示的記錄數(shù)</span>
<span>$show</span>       = <span>$Page</span>->show();<span>//</span><span> 分頁顯示輸出</span>
<span>$this</span>->assign('page',<span>$show</span>);<span>//</span><span> 賦值分頁輸出</span>
<span>$this</span>->display(); <span>//</span><span> 輸出模板</span>

帶入查詢條件
如果是POST方式查詢，如何確保分頁之后能夠保持原先的查詢條件呢，我們可以給分頁類傳入?yún)?shù)，方法是給分頁類的parameter屬性賦值

<span>$count</span>      = <span>$User</span>->where(<span>$map</span>)-><span>count</span>();<span>//</span><span> 查詢滿足要求的總記錄數(shù)</span>
<span>$Page</span>       = <span>new</span> \Think\Page(<span>$count</span>,25);<span>//</span><span> 實例化分頁類 傳入總記錄數(shù)和每頁顯示的記錄數(shù)
//分頁跳轉(zhuǎn)的時候保證查詢條件</span>
<span>foreach</span>(<span>$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> 分頁顯示輸出</span>

分頁樣式定制
我們可以對輸出的分頁樣式進行定制，分頁類Page提供了一個setConfig方法來修改默認(rèn)的一些設(shè)置。例如：

<span>$page</span>->setConfig('header','<li class="rows">共<b>%TOTAL_ROW%</b>條記錄  第<b>%NOW_PAGE%</b>頁/共<b>%TOTAL_PAGE%</b>頁</li>'<span>);
            </span><span>$page</span>->setConfig('prev', '上一頁'<span>);
            </span><span>$page</span>->setConfig('next', '下一頁'<span>);
            </span><span>$page</span>->setConfig('first', '首頁'<span>);
            </span><span>$page</span>->setConfig('last', '尾頁'<span>);    
            </span><span>$page</span>->setConfig('theme', '%FIRST% %UP_PAGE% %LINK_PAGE% %DOWN_PAGE% %END% %HEADER%');

setConfig方法支持的屬性包括：
header：頭部描述信息，默認(rèn)值 “共 %TOTAL_ROW% 條記錄”
next：下一頁描述信息，默認(rèn)值 “>>”
first：第一頁描述信息，默認(rèn)值 “1…”
last：最后一頁描述信息，默認(rèn)值 “…%TOTAL_PAGE%”
theme ：分頁主題描述信息，包括了上面所有元素的組合 ，設(shè)置該屬性可以改變分頁的各個單元的顯示位置，默認(rèn)值是 “%FIRST% %UP_PAGE% %LINK_PAGE% %DOWN_PAGE% %END%”

其中，顯示位置的對應(yīng)的關(guān)系為：
位置 說明
%FIRST% 表示第一頁的鏈接顯示
%UP_PAGE% 表示上一頁的鏈接顯示
%LINK_PAGE% 表示分頁的鏈接顯示
%DOWN_PAGE% 表示下一頁的鏈接顯示
%END% 表示最后一頁的鏈接顯示
除了改變顯示信息外，你還可以使用樣式來定義分頁的顯示效果。 這些樣式class包括：first（第一頁）、prev（上一頁）、next（下一頁）、end（最后一頁）、num（其他頁的數(shù)字）、current（當(dāng)前頁）。

ThinkPHP系統(tǒng)分頁類寫的已經(jīng)很完善只要花幾分鐘時間研究一下源代碼即可，官方注釋也很清晰。這里注解一下使用中的問題。系統(tǒng)默認(rèn)設(shè)置了

<code class="hljs cs has-numbering"><span class="hljs-keyword">public $rollPage   = <span class="hljs-number">11;<span class="hljs-comment">// 分頁欄每頁顯示的頁數(shù)
<span class="hljs-keyword">public $lastSuffix = <span class="hljs-keyword">true; <span class="hljs-comment">// 最后一頁是否顯示總頁數(shù)</span></span></span></span></span></span></code><br /><br />

　　一開始看注釋還不是很清楚，其實第一個參數(shù)是控制顯示多少頁數(shù)，如果默認(rèn)顯示11個頁碼一般太長，個人喜歡設(shè)置為5，當(dāng)然修改這些參數(shù)不要在系統(tǒng)源文件中修改，而是在使用的時候設(shè)置$page->rollPage=5即可。

　　而第二個參數(shù)就比較坑人了，我們在個性化分頁顯示的時候通常會采用setConfig('last','尾頁')； 用來設(shè)置最后一頁顯示為“尾頁”，但是在show方法中可以看到tp在$this->lastSuffix 為真的時候重置該$this->config['last']的值為總頁數(shù)這樣導(dǎo)致無論你怎么設(shè)置最后一業(yè)都顯示為數(shù)字。也不知道官方為什么這么設(shè)置，解決辦法依然是重新設(shè)置$page->lastSuffix = false; 即可。

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