我是WP的新手，我还没有对我提出的这种方法进行过太多测试。也许你可以帮我检查一下我是否正确。到目前为止，我找到的解决方案是实现相同的meta\\u查询逻辑，只是进行一些替换。

首先，用法：

$args = array(
    \'lang\' => \'pt\', //this function does not conflict (example: polylang)
    \'post_type\' => \'produtos\', 
    \'post_status\'   => \'publish\',
    \'posts_per_page\' => 10,
    \'paged\' =>  1,
    \'fields\' => \'ids\',
);
$args[\'meta_query] = [
    [\'relation\'] => \'OR\'; //any relation you desire
    [
        \'key\' => \'acf_field\', //any custom field (regular usage)
        \'value\' => $search, //any value (regular usage)
        \'compare\' => \'LIKE\', //any comparition (regular usage)
    ],
    [
        \'key\' => \'post_title\', //set the default post content of wordpress you desire (\'post_content\', \'post_title\' and \'post_excerpt\')
        \'value\' => $search, //any value
        \'compare\' => \'LIKE\', //tested with \'LIKE and \'=\', works great and I can\'t realize other needs.
    ],
    [
        \'key\' => \'post_exerpt\', // you can add how many times you need
        \'value\' => $search_2,
        \'compare\' => \'LIKE\', 
    ],
];
$the_query = new WP_Query( $args ); //jus query
wp_reset_postdata(); //clean your query

若要工作，请将此函数添加到主题函数中。php

function post_content_to_meta_queries($where, $wp_query){
    global $wpdb;

    //if there is no metaquery, bye!
    $meta_queries = $wp_query->get( \'meta_query\' );
    if( !$meta_queries || $meta_queries == \'\' ) return $where;

    //if only one relation
    $where = str_replace($wpdb->postmeta . ".meta_key = \'post_title\' AND " . $wpdb->postmeta . ".meta_value", $wpdb->posts . ".post_title", $where);
    $where = str_replace($wpdb->postmeta . ".meta_key = \'post_content\' AND " . $wpdb->postmeta . ".meta_value", $wpdb->posts . ".post_content", $where);
    $where = str_replace($wpdb->postmeta . ".meta_key = \'post_excerpt\' AND " . $wpdb->postmeta . ".meta_value", $wpdb->posts . ".post_excerpt", $where);

    ////for nested relations

    //count the numbers of meta queries for possible replacements
    $number_of_relations = count($meta_queries);

    //replace \'WHERE\' using the multidimensional postmeta naming logic used by wordpress core
    $i = 1;
    while($i<=$number_of_relations && $number_of_relations > 0){
        $where = str_replace("mt".$i.".meta_key = \'post_title\' AND mt".$i.".meta_value", $wpdb->posts . ".post_title", $where);
        $where = str_replace("mt".$i.".meta_key = \'post_content\' AND mt".$i.".meta_value", $wpdb->posts . ".post_content", $where);
        $where = str_replace("mt".$i.".meta_key = \'post_excerpt\' AND mt".$i.".meta_value", $wpdb->posts . ".post_excerpt", $where);
        $i++;
    }

    return $where;
}

add_filter(\'posts_where\',\'post_content_to_meta_queries\',10,2);

我很肯定这是可以改进的！希望有帮助！

我找不到一个解决方案来查找可以混合在帖子标题、描述和/或一个或多个元中的多个关键字，所以我自己添加了搜索功能。

您只需在函数中添加以下代码。php，并且每当您在WP\\u Query（）中使用\'s\'参数并希望它也搜索一个或多个时，只需添加一个\'s\\u meta\\u keys\'参数，该参数是要搜索的meta（s）键的数组：

/************************************************************************\\
|**                                                                    **|
|**  Allow WP_Query() search function to look for multiple keywords    **|
|**  in metas in addition to post_title and post_content               **|
|**                                                                    **|
|**  By rAthus @ Arkanite                                              **|
|**  Created: 2020-08-18                                               **|
|**  Updated: 2020-08-19                                               **|
|**                                                                    **|
|**  Just use the usual \'s\' argument and add a \'s_meta_keys\' argument  **|
|**  containing an array of the meta(s) key you want to search in :)   **|
|**                                                                    **|
|**  Example :                                                         **|
|**                                                                    **|
|**  $args = array(                                                    **|
|**      \'numberposts\'  => -1,                                         **|
|**      \'post_type\' => \'post\',                                        **|
|**      \'s\' => $MY_SEARCH_STRING,                                     **|
|**      \'s_meta_keys\' => array(\'META_KEY_1\',\'META_KEY_2\');            **|
|**      \'orderby\' => \'date\',                                          **|
|**      \'order\'   => \'DESC\',                                          **|
|**  );                                                                **|
|**  $posts = new WP_Query($args);                                     **|
|**                                                                    **|
\\************************************************************************/
add_action(\'pre_get_posts\', \'my_search_query\'); // add the special search fonction on each get_posts query (this includes WP_Query())
function my_search_query($query) {
    if ($query->is_search() and $query->query_vars and $query->query_vars[\'s\'] and $query->query_vars[\'s_meta_keys\']) { // if we are searching using the \'s\' argument and added a \'s_meta_keys\' argument
        global $wpdb;
        $search = $query->query_vars[\'s\']; // get the search string
        $ids = array(); // initiate array of martching post ids per searched keyword
        foreach (explode(\' \',$search) as $term) { // explode keywords and look for matching results for each
            $term = trim($term); // remove unnecessary spaces
            if (!empty($term)) { // check the the keyword is not empty
                $query_posts = $wpdb->prepare("SELECT * FROM {$wpdb->posts} WHERE post_status=\'publish\' AND ((post_title LIKE \'%%%s%%\') OR (post_content LIKE \'%%%s%%\'))", $term, $term); // search in title and content like the normal function does
                $ids_posts = [];
                $results = $wpdb->get_results($query_posts);
                if ($wpdb->last_error)
                    die($wpdb->last_error);
                foreach ($results as $result)
                    $ids_posts[] = $result->ID; // gather matching post ids
                $query_meta = [];
                foreach($query->query_vars[\'s_meta_keys\'] as $meta_key) // now construct a search query the search in each desired meta key
                    $query_meta[] = $wpdb->prepare("meta_key=\'%s\' AND meta_value LIKE \'%%%s%%\'", $meta_key, $term);
                $query_metas = $wpdb->prepare("SELECT * FROM {$wpdb->postmeta} WHERE ((".implode(\') OR (\',$query_meta)."))");
                $ids_metas = [];
                $results = $wpdb->get_results($query_metas);
                if ($wpdb->last_error)
                    die($wpdb->last_error);
                foreach ($results as $result)
                    $ids_metas[] = $result->post_id; // gather matching post ids
                $merged = array_merge($ids_posts,$ids_metas); // merge the title, content and meta ids resulting from both queries
                $unique = array_unique($merged); // remove duplicates
                if (!$unique)
                    $unique = array(0); // if no result, add a "0" id otherwise all posts wil lbe returned
                $ids[] = $unique; // add array of matching ids into the main array
            }
        }
        if (count($ids)>1)
            $intersected = call_user_func_array(\'array_intersect\',$ids); // if several keywords keep only ids that are found in all keywords\' matching arrays
        else
            $intersected = $ids[0]; // otherwise keep the single matching ids array
        $unique = array_unique($intersected); // remove duplicates
        if (!$unique)
            $unique = array(0); // if no result, add a "0" id otherwise all posts wil lbe returned
        unset($query->query_vars[\'s\']); // unset normal search query
        $query->set(\'post__in\',$unique); // add a filter by post id instead
    }
}

示例使用：

$search= "kewords to search";

$args = array(
    \'numberposts\'   => -1,
    \'post_type\' => \'post\',
    \'s\' => $search,
    \'s_meta_keys\' => array(\'short_desc\',\'tags\');
    \'orderby\' => \'date\',
    \'order\'   => \'DESC\',
);

$posts = new WP_Query($args);

此示例将查找关键字；kewords to search“要搜索的关键字”；在帖子标题、描述和元键“short\\u desc”和“tags”中。

关键字可以在一个或多个文件中找到，按任何顺序，它将返回在任何指定字段中包含所有关键字的任何帖子。

如果希望所有搜索查询都包含这些元键，则可以强制搜索包含在功能中的元键列表，并删除额外的agrument：）

希望这将帮助任何人谁面临同样的问题，我做了！