使用 Wordpress 中的当前帖子 ID 获取下一个/上一个帖子 ID

Question

我想写一个自定义的 next/prev 函数来动态地在fancybox弹出窗口中显示帖子信息。因此，我需要使用 PHP 根据当前显示的任何 Post 获取下一个和上一个 Post ID。我知道当前的帖子 ID 是什么，我可以将其发送给函数，但我不知道如何使用该 ID 来获取相邻的 ID。

编辑：这是我目前的代码（不起作用）

<?php
require_once("../../../wp-blog-header.php");

if (isset($_POST['data'])){
    $post_id = $_POST['data'];
}else{
    $post_id = "";
}
$wp_query->is_single = true;
$this_post = get_post($post_id);
$in_same_cat = false;
$excluded_categories = '';
$previous = false;
$next_post = get_adjacent_post($in_same_cat,$excluded_categories,$previous);


$post_id = $next_post->id;
$title = $next_post->post_title;

$dataset = array ( "postid"=>$post_id, "posttitle"=>$title );

//Because we want to use json, we have to place things in an array and encode it for json.
//This will give us a nice javascript object on the front side.

echo json_encode($dataset);


?>

Answer 1

get_adjacent_post() 使用全局 $post 作为其参考点，因此您需要替换它：

$this_post = get_post($post_id);

用这个：

global $post;
$post = get_post($post_id);

WordPress 还提供 get_next_post() 和 get_previous_post()，您可以在此处使用它们，而不是使用带有所有这些参数的 get_adjacent_post()。这是最终产品：

<?php
require_once("../../../wp-blog-header.php");

if (isset($_POST['data'])){
    $post_id = $_POST['data'];
}else{
    $post_id = "";
}
$wp_query->is_single = true;

global $post;
$post = get_post($post_id);

$previous_post = get_previous_post();
$next_post = get_next_post();

$post_id = $next_post->id;
$title = $next_post->post_title;

$dataset = array ( "postid"=>$post_id, "posttitle"=>$title );

//Because we want to use json, we have to place things in an array and encode it for json.
//This will give us a nice javascript object on the front side.

echo json_encode($dataset);

?>

我不确定您想为 $dataset 数组中上一篇和下一篇文章的 ID 和标题使用什么键，所以我暂时保留它。

Answer 2

要让它工作，我必须将$next_post->id; 更改为$next_post->ID;，即大写ID。

我在 Wordpress 中的 index.php 上这样使用它——我将它插入到循环的顶部：

<div class="work-post" id="<?php the_ID(); ?>">

然后在循环中我使用这个： `

        if (isset($_POST['data'])){
            $post_id = $_POST['data'];
        }else{
            $post_id = "";
        }
        $wp_query->is_single = true;

        global $post;
        $post = get_post($post_id);

        $next_post = get_next_post();
        $previous_post = get_previous_post();

        ?>

        <!-- call only if a value exists -->
            <?php if($next_post) : ?>
                <a href="#<?php echo $next_post->ID;?>" class="anchorLink"><div>PREV.</div></a>
            <?php endif; ?>
        <!-- call only if a value exists -->

        <!-- call only if a value exists -->
            <?php if($previous_post) : ?>
                <a href="#<?php echo $previous_post->ID;?>" class="anchorLink"><div>NEXT</div></a>
            <?php endif; ?>
        <!-- call only if a value exists -->`

Answer 3

这是我的代码，效果很好。 $post_id 是当前帖子 ID。

function get_previous_post_id( $post_id ) {
    // Get a global post reference since get_adjacent_post() references it
    global $post;
    // Store the existing post object for later so we don't lose it
    $oldGlobal = $post;
    // Get the post object for the specified post and place it in the global variable
    $post = get_post( $post_id );
    // Get the post object for the previous post
    $previous_post = get_previous_post();
    // Reset our global object
    $post = $oldGlobal;
    if ( '' == $previous_post ) 
        return 0;
    return $previous_post->ID; 
} 

function get_next_post_id( $post_id ) {
    // Get a global post reference since get_adjacent_post() references it
    global $post;
    // Store the existing post object for later so we don't lose it
    $oldGlobal = $post;
    // Get the post object for the specified post and place it in the global variable
    $post = get_post( $post_id );
    // Get the post object for the next post
    $next_post = get_next_post();
    // Reset our global object
    $post = $oldGlobal;
    if ( '' == $next_post ) 
        return 0;
    return $next_post->ID; 
} 

然后你只需调用函数。示例：

echo get_previous_post_id( $current_id );
echo get_next_post_id( $current_id );

祝你好运！