MVPR下的PHP分页教程

这个PHP分页其实不难，现在就开始看看核心思路吧。

我习惯从最底层开始看起。

1. 首先用LIMIT偏移QUERY的指针

    /*
    *    get hot post by current page
    *    @param [int]startNumOfPPost, [int]numOfPostPerPage
    *    @return [array]post
    */
    function getHotPostByCurrectPage($startNumOfPPost, $numOfPostPerPage)
    {
        consoleLog('CPost func getHotPostByCurrectPage');
        $sql = " SELECT id, category, date, authorId, editorId, title, abstract, abstractImg
                    FROM post
                        WHERE visitable = '1' AND isTop = '1'
                                ORDER BY date DESC, id DESC
                                    LIMIT ".$startNumOfPPost.", ".$numOfPostPerPage;
        $result = mysql_query($sql);
        while ($post = mysql_fetch_array($result))
        {
            $post['authorName'] = $this->getNameByUserId($post['authorId']);
            $post['editorName'] = $this->getNameByUserId($post['editorId']);
            $post['categoryName'] = $this->getCategoryNameById($post['category']);
            $arrPost[] = $post;
        }
        return $arrPost;
    }

2. Presenter渲染HTML

    function showHotPostList($currentPage)
    {
        consoleLogWithTitle('PostPresenter func showHotPostList var currentPage', $currentPage);
        $postModel = $this->postModel;

        // get the first post id of current page
        $numOfPostPerPage = $this->numOfPostPerPage;
        $startNumOfPPost = ($currentPage-1)*$numOfPostPerPage;

        // get post from db
        $arrPost = $postModel->getHotPostByCurrectPage($startNumOfPPost, $numOfPostPerPage);

        foreach ($arrPost AS $post)
        {
            echo '
                <div class="gobalPost">
                    <div class="gobalPostImg">
                        <a href="#"> <div class="gobalPostImgHeaderCentered" style="background-image: url(\''.$post['abstractImg'].'\');" ></div> </a>
                        <div class="gobalPostImgTag"> <a href="#">'.$post['categoryName'].'</a> </div>
                    </div>  <!-- gobalPostImg -->

                    <div class="gobalPostContext">
                        <div class="fontSize20 color111">
                            <a href="../post/post.php?postId='.$post['id'].'">'.$post['title'].'</a>
                        </div>
                        <div class="mTop2 fontSize12 color666">
                            '.$post['date'].'
                            &nbsp  作者：<a href="#">'.$post['authorName'].'</a>
                            &nbsp  编辑：<a href="#">'.$post['editorName'].'</a>
                        </div>
                        <div class="mTop8 fontSize13 color333">
                            '.$post['abstract'].'
                        </div>
                    </div> <!-- gobalPostContext -->
                </div> <!-- gobalPost -->
            ';
        }
    }

3. View，视图层

<?php
    $postPresenter->showHotPostList($currentPage);
?>

有了核心的Business层，那就是创建PageSelector。

1. get amoumt of total post in db

2. prensenter render page selector

    function getPageSelectorCellHTML($numOfPage)
    {
        $selectorCellHTML = "";
        for ( $x = 1; $x <= $numOfPage; $x++)
        {
            $selectorCellHTML .= ' <a class="item" href="../../view/home/index.php?currentPage='.$x.'">'.$x.'</a> ';
        }
        return $selectorCellHTML;
    }

    function renderPageSelector($currentPage)
    {
        consoleLogWithTitle('PostPresenter func renderPageSelector var currentPage', $currentPage);
        $postModel = $this->postModel;
        $totalPost = count($postModel->getHotPostOrderById());
        $numOfPage = ceil($totalPost / $this->numOfPostPerPage);

        echo '
        <div class="ui basic very padded center aligned segment container">
            <div class="ui inverted pagination menu">
                <a class="item"><i class="icon purple left arrow"></i></a>
                '.$this->getPageSelectorCellHTML($numOfPage).'
                <a class="item"><i class="icon purple right arrow"></i></a>
            </div>
        </div>
        ';
    }

这里要有良好的命名。renderPageSelector是渲染，getPageSelectorCellHTML是构造HTML。

而renderPageSelector是调用getPageSelectorCellHTML，因此要把构造HTML方法，放在主体之前，这是C++的开发概念。

3. View

<?php $postPresenter->renderPageSelector($currentPage); ?>

那PHP分页功能就完成了。