在 CMS 中创建过滤系统的最佳逻辑是什么，然后添加选项来选择显示多少过滤结果？

Question

我正在为博客构建 CMS，并添加了过滤管理仪表板上帖子的选项。选项是已发布的帖子、草稿帖子、评论的帖子和查看次数最多的帖子。 这是代码

<?php
function get_options($select){

$filters = array('All posts' => 1, 'Published Posts' => 2, 'Drafted Posts' => 3, 'Commented Posts' => 4, 'Most Viewed Posts' => 5);

$options = '';

foreach($filters as $k => $v) {
    if($select == $v){
        $options.='<option value="'.$v.'" selected>'.$k.'</option>';
    } else {

        $options.='<option value="'.$v.'">'.$k.'</option>';
    }
}

return $options;

}

?>
<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post" id="filter">

    <div id="bulkOptionsContainer" class="col-xs-3">

        <select class="form-control" name="filter_posts" onchange="this.form.submit();">
            <option value="">Filter Posts</option>
            <?php echo get_options($selected); ?>
        </select><br>

    </div>

</form>
<?php
if(isset($_POST['filter_posts'])) {

            $filter_posts = $_POST['filter_posts'];

            switch ($filter_posts) {

                case '1';

                    include_once("all_posts.php"); //Here is query for all posts from database

                    break;

                case '2';

                   include_once("published_posts.php"); //Here is query for published posts from database

                    break;


                case '3';

                    include_once("draft_posts.php"); //Here is code for drafted posts from database

                    break;

                case '4';

                    include_once("commented_posts.php");//Here is query for commented posts from database

                    break;

                case '5';

                   include_once("most_viewed_posts.php");//Here is query for most viewed posts from database


                    break;
            }
        }
?>

这对我有用，我得到了所有想要的结果，但我想添加一个功能来选择在页面上显示多少结果。例如显示 20 个帖子、显示 40 个帖子、显示所有帖子。但它需要显示，例如，如果我将帖子过滤到已发布的帖子，并选择显示 20 个帖子，它需要为已发布的帖子显示 20 个帖子等。如何做到这一点？ 这是用于选择选项的 HTML。

<form action="" method="post">
    <div id="bulkOptionsContainer" class="col-xs-2">
        <select name="select_num_posts" class="form-control">

            <option value="20" selected>Show 20</option>
            <option value="40">Show 40</option>
            <option value="all">Show All</option>

        </select>
    </div>

    <div class="col-xs-4">
        <input type="submit" name="submit" class="btn btn-success" value="Apply">
    </div>
</form>

Answer 1

您可以创建更多的 PHP 文件，称为 draft_posts_20.php、draft_posts_40.php 和 draft_posts_all.php 等，但这会创建很多很多文件。显然这种方法是有缺陷的。

我假设这些文件中的每一个，all_posts.php、draft_posts.php 等都包含非常相似的代码。有一个数据库查询和一些输出代码。它们基本上是彼此的副本，略有不同。

我认为您应该尝试将它们全部放入一个 PHP 文件中，然后再合并您的新过滤器。所有这些的输出部分都应该相同，只是您需要根据您的两个过滤器更改数据库查询。

Answer 2

这是来自单页版本的代码。这样我就可以过滤帖子，但我不知道如何过滤过滤后的帖子，以显示 20、40 等。

<?php
    function get_options($select){

        $filters = array('All posts' => 1, 'Published Posts' => 2, 'Drafted Posts' => 3, 'Commented Posts' => 4, 'Most Viewed Posts' => 5);

        $options = '';

        foreach($filters as $k => $v) {
            if($select == $v){
                $options.='<option value="'.$v.'" selected>'.$k.'</option>';
            } else {

                $options.='<option value="'.$v.'">'.$k.'</option>';
            }
        }

        return $options;

    }

    function get_num_options($select){

        $filters = array('Show 20' => 20, 'Show 40' => 40, 'Show All' => 'all');

        $options = '';

        foreach($filters as $k => $v) {
            if($select == $v){
                $options.='<option value="'.$v.'" selected>'.$k.'</option>';
            } else {

                $options.='<option value="'.$v.'">'.$k.'</option>';
            }
        }

        return $options;

    }

?>    
    <form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post" id="filter">

        <div id="bulkOptionsContainer" class="col-xs-3">

            <select class="form-control" name="filter_posts" onchange="this.form.submit();">
                <option value="">Filter Posts</option>
                <?php echo get_options($selected); ?>
            </select><br>

        </div>

    </form>

<?php    
      if (!isset($_POST['filter_posts'])) {


                    $stmt1 = mysqli_prepare($connection, "SELECT posts.post_id, posts.post_author, posts.post_user, posts.post_title, posts.post_category_id, posts.comment_status, posts.post_image, posts.post_tags, posts.post_comment_count, posts.post_date, posts.post_views_count, categories.cat_id, categories.cat_title FROM posts LEFT JOIN categories ON posts.post_category_id = categories.cat_id ORDER BY post_id DESC");

                    //Bind
                    //mysqli_stmt_bind_param();
                    //Execute
                    mysqli_stmt_execute($stmt1);
                    mysqli_stmt_store_result($stmt1);
                    //Result
                    mysqli_stmt_bind_result($stmt1, $post_id, $post_author, $post_user, $post_title, $post_category_id, $comment_status, $post_image, $post_tags, $post_comment_count, $post_date, $post_views_count, $cat_id, $cat_title);

                    confirmQuery($stmt1);

                    $stmt2 = mysqli_prepare($connection, "SELECT posts.post_id, posts.post_author, posts.post_user, posts.post_title, posts.post_category_id, posts.comment_status, posts.post_image, posts.post_tags, posts.post_comment_count, posts.post_date, posts.post_views_count, categories.cat_id, categories.cat_title FROM posts LEFT JOIN categories ON posts.post_category_id = categories.cat_id WHERE posts.user_id = " . loggedInUserId() . " ORDER BY post_id DESC");

                    //Bind
                    //mysqli_stmt_bind_param();
                    //Execute
                    mysqli_stmt_execute($stmt2);
                    mysqli_stmt_store_result($stmt2);
                    //Result
                    mysqli_stmt_bind_result($stmt2, $post_id, $post_author, $post_user, $post_title, $post_category_id, $comment_status, $post_image, $post_tags, $post_comment_count, $post_date, $post_views_count, $cat_id, $cat_title);

                    confirmQuery($stmt2);

                    if (is_admin()) {

                        $stmt = $stmt1;
                    } else {

                        $stmt = $stmt2;
                    }
                } else {

                    $filter_posts = $_POST['filter_posts'];

                    switch ($filter_posts) {

                        case '1';

                            $stmt1 = mysqli_prepare($connection, "SELECT posts.post_id, posts.post_author, posts.post_user, posts.post_title, posts.post_category_id, posts.comment_status, posts.post_image, posts.post_tags, posts.post_comment_count, posts.post_date, posts.post_views_count, categories.cat_id, categories.cat_title FROM posts LEFT JOIN categories ON posts.post_category_id = categories.cat_id ORDER BY post_id DESC");

                            //Bind
                            //mysqli_stmt_bind_param();
                            //Execute
                            mysqli_stmt_execute($stmt1);
                            mysqli_stmt_store_result($stmt1);
                            //Result
                            mysqli_stmt_bind_result($stmt1, $post_id, $post_author, $post_user, $post_title, $post_category_id, $comment_status, $post_image, $post_tags, $post_comment_count, $post_date, $post_views_count, $cat_id, $cat_title);

                            confirmQuery($stmt1);

                            $stmt2 = mysqli_prepare($connection, "SELECT posts.post_id, posts.post_author, posts.post_user, posts.post_title, posts.post_category_id, posts.comment_status, posts.post_image, posts.post_tags, posts.post_comment_count, posts.post_date, posts.post_views_count, categories.cat_id, categories.cat_title FROM posts LEFT JOIN categories ON posts.post_category_id = categories.cat_id WHERE posts.user_id = " . loggedInUserId() . " ORDER BY post_id DESC");

                            //Bind
                            //mysqli_stmt_bind_param();
                            //Execute
                            mysqli_stmt_execute($stmt2);
                            mysqli_stmt_store_result($stmt2);
                            //Result
                            mysqli_stmt_bind_result($stmt2, $post_id, $post_author, $post_user, $post_title, $post_category_id, $comment_status, $post_image, $post_tags, $post_comment_count, $post_date, $post_views_count, $cat_id, $cat_title);

                            confirmQuery($stmt2);

                            if (is_admin()) {

                                $stmt = $stmt1;
                            } else {

                                $stmt = $stmt2;
                            }

                            break;

                        case '2';

                            $stmt1 = mysqli_prepare($connection, "SELECT posts.post_id, posts.post_author, posts.post_user, posts.post_title, posts.post_category_id, posts.comment_status, posts.post_image, posts.post_tags, posts.post_comment_count, posts.post_date, posts.post_views_count, categories.cat_id, categories.cat_title FROM posts LEFT JOIN categories ON posts.post_category_id = categories.cat_id WHERE posts.comment_status = ? ORDER BY post_id DESC");

                            //Bind
                            //mysqli_stmt_bind_param();
                            mysqli_stmt_bind_param($stmt1, "s", $comment_status);

                            $comment_status = 'published';
                            //Execute
                            mysqli_stmt_execute($stmt1);
                            mysqli_stmt_store_result($stmt1);
                            //Result
                            mysqli_stmt_bind_result($stmt1, $post_id, $post_author, $post_user, $post_title, $post_category_id, $comment_status, $post_image, $post_tags, $post_comment_count, $post_date, $post_views_count, $cat_id, $cat_title);

                            confirmQuery($stmt1);

                            $stmt2 = mysqli_prepare($connection, "SELECT posts.post_id, posts.post_author, posts.post_user, posts.post_title, posts.post_category_id, posts.comment_status, posts.post_image, posts.post_tags, posts.post_comment_count, posts.post_date, posts.post_views_count, categories.cat_id, categories.cat_title FROM posts LEFT JOIN categories ON posts.post_category_id = categories.cat_id WHERE posts.comment_status = ? AND posts.user_id = " . loggedInUserId() . " ORDER BY post_id DESC");

                            //Bind
                            //mysqli_stmt_bind_param();
                            mysqli_stmt_bind_param($stmt2, "s", $comment_status);

                            $comment_status = 'published';
                            //Execute
                            mysqli_stmt_execute($stmt2);
                            mysqli_stmt_store_result($stmt2);
                            //Result
                            mysqli_stmt_bind_result($stmt2, $post_id, $post_author, $post_user, $post_title, $post_category_id, $comment_status, $post_image, $post_tags, $post_comment_count, $post_date, $post_views_count, $cat_id, $cat_title);

                            confirmQuery($stmt2);

                            if (is_admin()) {

                                $stmt = $stmt1;
                            } else {

                                $stmt = $stmt2;
                            }

                            break;


                        case '3';

                            $stmt1 = mysqli_prepare($connection, "SELECT posts.post_id, posts.post_author, posts.post_user, posts.post_title, posts.post_category_id, posts.comment_status, posts.post_image, posts.post_tags, posts.post_comment_count, posts.post_date, posts.post_views_count, categories.cat_id, categories.cat_title FROM posts LEFT JOIN categories ON posts.post_category_id = categories.cat_id WHERE posts.comment_status = ? ORDER BY post_id DESC");

                            //Bind
                            //mysqli_stmt_bind_param();
                            mysqli_stmt_bind_param($stmt1, "s", $comment_status);

                            $comment_status = 'draft';
                            //Execute
                            mysqli_stmt_execute($stmt1);
                            mysqli_stmt_store_result($stmt1);
                            //Result
                            mysqli_stmt_bind_result($stmt1, $post_id, $post_author, $post_user, $post_title, $post_category_id, $comment_status, $post_image, $post_tags, $post_comment_count, $post_date, $post_views_count, $cat_id, $cat_title);

                            confirmQuery($stmt1);

                            $stmt2 = mysqli_prepare($connection, "SELECT posts.post_id, posts.post_author, posts.post_user, posts.post_title, posts.post_category_id, posts.comment_status, posts.post_image, posts.post_tags, posts.post_comment_count, posts.post_date, posts.post_views_count, categories.cat_id, categories.cat_title FROM posts LEFT JOIN categories ON posts.post_category_id = categories.cat_id WHERE posts.comment_status = ? AND posts.user_id = " . loggedInUserId() . " ORDER BY post_id DESC");

                            //Bind
                            //mysqli_stmt_bind_param();
                            mysqli_stmt_bind_param($stmt2, "s", $comment_status);

                            $comment_status = 'draft';
                            //Execute
                            mysqli_stmt_execute($stmt2);
                            mysqli_stmt_store_result($stmt2);
                            //Result
                            mysqli_stmt_bind_result($stmt2, $post_id, $post_author, $post_user, $post_title, $post_category_id, $comment_status, $post_image, $post_tags, $post_comment_count, $post_date, $post_views_count, $cat_id, $cat_title);

                            confirmQuery($stmt2);

                            if (is_admin()) {

                                $stmt = $stmt1;
                            } else {

                                $stmt = $stmt2;
                            }

                            break;

                        case '4';

                            $stmt1 = mysqli_prepare($connection, "SELECT posts.post_id, posts.post_author, posts.post_user, posts.post_title, posts.post_category_id, posts.comment_status, posts.post_image, posts.post_tags, posts.post_comment_count, posts.post_date, posts.post_views_count, categories.cat_id, categories.cat_title FROM posts LEFT JOIN categories ON posts.post_category_id = categories.cat_id WHERE posts.post_comment_count > 0 ORDER BY post_id DESC");

                            //Bind
                            //mysqli_stmt_bind_param();

                            //Execute
                            mysqli_stmt_execute($stmt1);
                            mysqli_stmt_store_result($stmt1);
                            //Result
                            mysqli_stmt_bind_result($stmt1, $post_id, $post_author, $post_user, $post_title, $post_category_id, $comment_status, $post_image, $post_tags, $post_comment_count, $post_date, $post_views_count, $cat_id, $cat_title);

                            confirmQuery($stmt1);

                            $stmt2 = mysqli_prepare($connection, "SELECT posts.post_id, posts.post_author, posts.post_user, posts.post_title, posts.post_category_id, posts.comment_status, posts.post_image, posts.post_tags, posts.post_comment_count, posts.post_date, posts.post_views_count, categories.cat_id, categories.cat_title FROM posts LEFT JOIN categories ON posts.post_category_id = categories.cat_id WHERE posts.post_comment_count > 0 AND posts.user_id = " . loggedInUserId() . " ORDER BY post_id DESC");

                            //Bind
                            //mysqli_stmt_bind_param();
                            //Execute
                            mysqli_stmt_execute($stmt2);
                            mysqli_stmt_store_result($stmt2);
                            //Result
                            mysqli_stmt_bind_result($stmt2, $post_id, $post_author, $post_user, $post_title, $post_category_id, $comment_status, $post_image, $post_tags, $post_comment_count, $post_date, $post_views_count, $cat_id, $cat_title);

                            confirmQuery($stmt2);

                            if (is_admin()) {

                                $stmt = $stmt1;
                            } else {

                                $stmt = $stmt2;
                            }

                            break;

                        case '5';

                            $stmt1 = mysqli_prepare($connection, "SELECT posts.post_id, posts.post_author, posts.post_user, posts.post_title, posts.post_category_id, posts.comment_status, posts.post_image, posts.post_tags, posts.post_comment_count, posts.post_date, posts.post_views_count, categories.cat_id, categories.cat_title FROM posts LEFT JOIN categories ON posts.post_category_id = categories.cat_id ORDER BY post_views_count DESC");

                            //Bind
                            //mysqli_stmt_bind_param();
                            //Execute
                            mysqli_stmt_execute($stmt1);
                            mysqli_stmt_store_result($stmt1);
                            //Result
                            mysqli_stmt_bind_result($stmt1, $post_id, $post_author, $post_user, $post_title, $post_category_id, $comment_status, $post_image, $post_tags, $post_comment_count, $post_date, $post_views_count, $cat_id, $cat_title);

                            confirmQuery($stmt1);

                            $stmt2 = mysqli_prepare($connection, "SELECT posts.post_id, posts.post_author, posts.post_user, posts.post_title, posts.post_category_id, posts.comment_status, posts.post_image, posts.post_tags, posts.post_comment_count, posts.post_date, posts.post_views_count, categories.cat_id, categories.cat_title FROM posts LEFT JOIN categories ON posts.post_category_id = categories.cat_id WHERE posts.user_id = " . loggedInUserId() . " ORDER BY post_views_count DESC");

                            //Bind
                            //mysqli_stmt_bind_param();
                            //Execute
                            mysqli_stmt_execute($stmt2);
                            mysqli_stmt_store_result($stmt2);
                            //Result
                            mysqli_stmt_bind_result($stmt2, $post_id, $post_author, $post_user, $post_title, $post_category_id, $comment_status, $post_image, $post_tags, $post_comment_count, $post_date, $post_views_count, $cat_id, $cat_title);

                            confirmQuery($stmt2);

                            if (is_admin()) {

                                $stmt = $stmt1;
                            } else {

                                $stmt = $stmt2;
                            }



                            break;
                    }
                }

                while (mysqli_stmt_fetch($stmt)) {

                   //Echo result
                }



                ?>

    <form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post" id="filter">

        <div id="bulkOptionsContainer" class="col-xs-3">

            <select class="form-control" name="select_num_posts" onchange="this.form.submit();">
                <option value="">Show Posts</option>
                <?php echo get_num_options($selected); ?>
            </select><br>

        </div>

    </form>