如何编写返回自定义字段数据的WP\\U查询

这通常不是必需的。您可以简单地单独访问查询中每个帖子的元数据（就像您已经做的那样）。您还可以在一个页面中多次迭代查询（它会自动倒带开始，这就是while( have_posts() ) 零件有）。

如果您关心性能方面，元数据访问大量缓存在内存（或对象缓存）中。在页面加载中多次检索元数据不会导致重复查询，只会提取一次并重新使用。

下面是一个过于简化的示例，说明了您可能需要执行的操作：使用JsonSerializable:

class \\JsonQuery extends \\WP_Query implements \\JsonSerializable
{
    public function jsonSerialize()
    {
        return array_map( function( \\WP_Post $post ) {
            return array_merge( 
                $post->to_array(),
                get_post_custom( $post->ID )
            );
        }, $this->get_posts() )
    }
}

// Enqueue script here!
$query = new \\JsonQuery( [
    /* arguments you use in normal \\WP_Query */
] );
wp_localize_script( \'script-handle\', \'globalJsVarName\', json_encode( $query ) );

注：

上面的代码没有经过测试（实际上我有两个电话，所以可能有点不对劲）

好的，我想我理解你的要求，请告诉我我在左外野。

首先，您需要看看以下内容：https://aarontgrogg.com/blog/2015/12/16/getting-to-know-and-adding-json-ld-to-a-wordpress-site/

现在我专门使用它来获取模式数据，但我相信您可以提供其他类型的有效负载，例如javascript。

接下来的主要问题是如何将自定义字段数据获取到有效负载中，我想这就是您真正想问的问题？

无论如何，使用该链接中描述的方法来创建json，我已经想到了这个问题-

<?php include(\'json-ld.php\');?>
<script type="application/ld+json"><?php echo json_encode($payload); ?></script>

<?php 
// JSON - LD for Reaction 

// Global Call

function get_post_data() {
    global $post;
    return $post;
}


$post_data = get_post_data();
$payload["@context"] = "http://schema.org/";

//blog posts

if (is_singular(\'post\')) {

    //variables for the post

    $post_url = get_permalink();
    $post_thumb = wp_get_attachment_url(get_post_thumbnail_id($post->ID));
    $excerpt= get_the_excerpt($post->ID); //  grab the post excerpt.
    $author_select = get_field(\'author\', $post->ID);
    $moddatetime = new DateTime($post_data->post_date); 


    // getting the team member


    if ($author_select == \'reaction\') {

        $postauthor = \'Reaction\';

    } 

    else if ($author_select == \'guest\') { 

         $postauthor = get_field(\'guest_writer_name\', $post->ID);

    } else {

        $author = get_field(\'team_member\', $post->ID);
            foreach($author as $member) {               
            $postauthor = $member->post_title;
        }

    }

    // getting the tags

    $posttags = get_the_tags();
    if ($posttags) {
      foreach($posttags as $tag) {
       $value .= $tag->name . \', \'; 
      }
    }
    $value = rtrim($value,\', \');


    //payload

    $payload["@type"] = "blogPost";
    $payload["url"] = $post_url;
    $payload["creator"] = array(
        "@type" => "Person", 
        "name" => $postauthor, // outputs my post author as per the calls above
        ); 

    $payload["headline"] = $post_data->post_title; // works
    $payload["datePublished"] = $moddatetime->format(DateTime::ISO8601);  // works
    $payload["image"] = $post_thumb;
    $payload["description"] = $excerpt; // works
    $payload["about"] = $value; // works

}


// home page

if (is_front_page()) {

    $logourl = get_site_url();


    $payload["@type"] = "Organization";
    $payload["name"] = "Reaction Marketing";
    $payload["logo"] = $logourl . \'/reaction-logo.png\';
    $payload["url"] = get_site_url();
    $payload["sameAs"] = array("http://twitter.com/reaction", "https://www.facebook.com/ReactionMarketing", "http://www.linkedin.com/company/reaction-marketing");
    $payload["contactPoint"] = array(array("@type" => "ContactPoint", "telephone" => "+1 403 346 6580", "email" => "[email protected]", "contactType" => "sales"));
}

?>

<script type=\'application/ld+json\'>{"@context":"http:\\/\\/schema.org","@type":"WebSite","url":"http:\\/\\/reaction.ca\\/","name":"Reaction","alternateName":"Reaction","potentialAction":{"@type":"SearchAction","target":"http:\\/\\/reaction.ca\\/?s={search_term_string}","query-input":"required name=search_term_string"}}</script>
<script type=\'application/ld+json\'>{"@context":"http:\\/\\/schema.org","@type":"Organization","url":"http:\\/\\/reaction.ca\\/","sameAs":["https:\\/\\/www.facebook.com\\/ReactionMarketing","https:\\/\\/www.instagram.com\\/reaction","https:\\/\\/www.linkedin.com\\/company\\/reaction-marketing","https:\\/\\/twitter.com\\/reaction"],"name":"Reaction Marketing","logo":"http:\\/\\/reaction.ca\\/uploads\\/REACTION-RGB.jpg"}</script>

这似乎符合你的要求吗？