我正按分类标准创建相关帖子。 我有代码： （在functions.php中）
// Create a query for the custom taxonomy
function related_posts_by_taxonomy( $post_id, $taxonomy, $args=array() ) {
$terms = wp_get_object_terms( $post_id, $taxonomy );
// Make sure we have terms from the current post
if ( count( $terms ) ) {
$post_ids = get_objects_in_term( $terms[0]->term_id, $taxonomy );
$post = get_post( $post_id );
$post_type = get_post_type( $post );
// Only search for the custom taxonomy on whichever post_type
// we AREN'T currently on
// This refers to the custom post_types you created so
// make sure they are spelled/capitalized correctly
if ( strcasecmp($post_type, 'colors') == 0 ) {
$type = 'colors';
} else {
$type = 'colors';
}
$args = wp_parse_args( $args, array(
'post_type' => $type,
'post__not_in' => array($post_id),
'post__in' => $post_ids,
'taxonomy' => $taxonomy,
'term' => $terms[1]->slug,
'posts_per_page' => 5,
'orderby' => 'rand'
) );
$query = new WP_Query( $args );
}
print_r($post_id);
// Return our results in query form
return $query;
}
在我的模板single-colors.php
中<?php $related = related_posts_by_taxonomy( $post->ID, 'colors_tax' );
while ( $related->have_posts() ): $related->the_post(); ?>
<strong class="center block fz">
<?php echo $ncolors; ?>
</strong>
<h1 class="no-m"><?php the_title();?></h1>
<?php endwhile; ?>
代码有效。但是这个代码也显示我的帖子重复（在分类的相关帖子中）。如何消除它？ 'post__not_in' => array($post_id)不起作用。
答案 0 :(得分：4)
正如我已经说过的，你的代码是完全错误的，不起作用。我不会详细介绍您的代码，因为我只是废弃您的代码并从头开始
以下是我最近在WPSE上发布的帖子的副本。这基本上是一个复制和粘贴解决方案，这里唯一的事情是帖子没有粗略排序，所以你需要在查询参数中添加随机排序。
这是帖子：
我只是废弃上面的函数，因为代码中有几个错误，也不是很有效。实际上，我真的很高兴它真的适合你。
这里最好的解决方案是编写一个完整的新功能。这是我们想要做的以及我们将如何完成这个
在单个帖子页面上获取当前帖子对象。 $post不可靠，因此我们将在此处使用主查询对象，我们将使用get_queried_object()返回该对象。从这里我们可以使用帖子ID和帖子类型来获取其他相关信息
使用wp_get_post_term()获取当前帖子的条款。我们将fields参数设置为仅获取术语ID。然后可以在我们的tax_query
添加一些验证以验证用户输入并清理输入
让我们把它全部放在代码中（ CAVEAT：这都是未经测试的，至少需要PHP 5.4 + ）
function get_related_posts( $taxonomy = '', $args = [] )
{
/*
* Before we do anything and waste unnecessary time and resources, first check if we are on a single post page
* If not, bail early and return false
*/
if ( !is_single() )
return false;
/*
* Check if we have a valid taxonomy and also if the taxonomy exists to avoid bugs further down.
* Return false if taxonomy is invalid or does not exist
*/
if ( !$taxonomy )
return false;
$taxonomy = filter_var( $taxonomy, FILTER_SANITIZE_STRING );
if ( !taxonomy_exists( $taxonomy ) )
return false;
/*
* We have made it to here, so we should start getting our stuff togther.
* Get the current post object to start of
*/
$current_post = get_queried_object();
/*
* Get the post terms, just the ids
*/
$terms = wp_get_post_terms( $current_post->ID, $taxonomy, ['fields' => 'ids'] );
/*
* Lets only continue if we actually have post terms and if we don't have an WP_Error object. If not, return false
*/
if ( !$terms || is_wp_error( $terms ) )
return false;
/*
* Set the default query arguments
*/
$defaults = [
'post_type' => $current_post->post_type,
'post__not_in' => [$current_post->ID],
'tax_query' => [
[
'taxonomy' => $taxonomy,
'terms' => $terms,
'include_children' => false
],
],
];
/*
* Validate and merge the defaults with the user passed arguments
*/
if ( is_array( $args ) ) {
$args = wp_parse_args( $args, $defaults );
} else {
$args = $defaults;
}
/*
* Now we can query our related posts and return them
*/
$q = get_posts( $args );
return $q;
}
现在我们已经有了更好的功能，我们可以在单个帖子页面或内容模板部分中使用它，具体取决于您的确切用例。您可能已经注意到，我们的新函数get_related_posts()有两个参数，第一个接受单个分类值，第二个接受参数数组。这个参数将传递给我们的查询的参数，因此您可以传递任何可在此处WP_Query和get_posts加入的有效参数数组。
示例：
您需要返回一个帖子，因此您可以尝试以下操作：（请注意，请勿在此处使用post type参数或任何分类法类型参数，否则可能会出现意外输出 ）
if ( function_exists( 'get_related_posts' ) ) {
$related_posts = get_related_posts( 'my_taxonomy_name', ['posts_per_page' => 1] );
if ( $related_posts ) {
foreach ( $related_posts as $post ) {
setup_postdata( $post );
// Use your template tags and html mark up as normal like
the_title();
the_content();
// etc etc
}
wp_reset_postdata();
}
}
从评论看来，你的PHP版本似乎早于5.4，它不支持新的短数组语法（[]），因此你得到了可怕的WSOD。为此，您需要将新数组语法更改为旧语法（array()）。
您可以尝试以下操作：
function get_related_posts( $taxonomy = '', $args = array() )
{
/*
* Before we do anything and waste unnecessary time and resources, first check if we are on a single post page
* If not, bail early and return false
*/
if ( !is_single() )
return false;
/*
* Check if we have a valid taxonomy and also if the taxonomy exists to avoid bugs further down.
* Return false if taxonomy is invalid or does not exist
*/
if ( !$taxonomy )
return false;
$taxonomy = filter_var( $taxonomy, FILTER_SANITIZE_STRING );
if ( !taxonomy_exists( $taxonomy ) )
return false;
/*
* We have made it to here, so we should start getting our stuff togther.
* Get the current post object to start of
*/
$current_post = get_queried_object();
/*
* Get the post terms, just the ids
*/
$terms = wp_get_post_terms( $current_post->ID, $taxonomy, array( 'fields' => 'ids') );
/*
* Lets only continue if we actually have post terms and if we don't have an WP_Error object. If not, return false
*/
if ( !$terms || is_wp_error( $terms ) )
return false;
/*
* Set the default query arguments
*/
$defaults = array(
'post_type' => $current_post->post_type,
'post__not_in' => array( $current_post->ID),
'tax_query' => array(
array(
'taxonomy' => $taxonomy,
'terms' => $terms,
'include_children' => false
),
),
);
/*
* Validate and merge the defaults with the user passed arguments
*/
if ( is_array( $args ) ) {
$args = wp_parse_args( $args, $defaults );
} else {
$args = $defaults;
}
/*
* Now we can query our related posts and return them
*/
$q = get_posts( $args );
return $q;
}
然后使用模板中的代码，转到
if ( function_exists( 'get_related_posts' ) ) {
$related_posts = get_related_posts( 'my_taxonomy_name', array( 'posts_per_page' => 1) );
if ( $related_posts ) {
foreach ( $related_posts as $post ) {
setup_postdata( $post );
// Use your template tags and html mark up as normal like
the_title();
the_content();
// etc etc
}
wp_reset_postdata();
}
}