也许您可以尝试直接在查询字符串中添加您的条件，使用类似的方法

function wpse_29570_where_filter($where){
        global $wpdb;
        if( is_search() ) {
            $search= get_query_var(\'s\');
            $query=$wpdb->prepare("SELECT user_id  FROM $wpdb->usermeta WHERE ( meta_key=\'first_name\' AND meta_value LIKE \'%%%s%%\' ) or ( meta_key=\'last_name\' AND meta_value LIKE \'%%%s%%\' )", $search ,$search);
            $authorID= $wpdb->get_var( $query );

            if($authorID){
                $where = "  AND  ( wp_posts.post_author = {$authorID} ) ";
            }

         }
         return $where;
    }

    add_filter(\'posts_where\',\'wpse_29570_where_filter\');

改进了@hacksy的答案，我使用了相同的代码块，但将其更改为使用WP Job Manager plugin.

function add_author_to_search($where) {
    global $wpdb;
    if( is_search() ) { // Check if a search is made
        $search = get_query_var(\'s\');
        $like = \'%\' . $wpdb->esc_like( $search ) . \'%\';
        $query = $wpdb->prepare( "SELECT user_id FROM $wpdb->usermeta WHERE ( meta_key=\'first_name\' AND lower(meta_value) LIKE \'%%%s%%\' ) OR ( meta_key=\'last_name\' AND lower(meta_value) LIKE \'%%%s%%\' ) OR ( meta_key=\'_company_name\' AND lower(meta_value) LIKE \'%%%s%%\' )", $search, $search, $search);
        $authorID = $wpdb->get_var( $query );

        if ($authorID) { // If a user_id matches a user
            $where .= " OR " .$wpdb->posts. ".post_author = {$authorID} AND " .$wpdb->posts. ".post_name LIKE \'" .$like. "\'"; // Add to query of function: $GLOBALS[$WP_QUERY_VAR]->request
        }
     }
     return $where;
}

add_filter(\'posts_where\',\'add_author_to_search\');

我无法找到对我有用的答案，但我发现：https://danielbachhuber.com/2012/02/07/include-posts-by-matching-authors-in-your-search-results/

在未进行任何编辑的情况下工作。以下是链接过期时的代码：

    /**
 * Include posts from authors in the search results where
 * either their display name or user login matches the query string
 *
 * @author danielbachhuber
 */
add_filter( \'posts_search\', \'db_filter_authors_search\' );
function db_filter_authors_search( $posts_search ) {

    // Don\'t modify the query at all if we\'re not on the search template
    // or if the LIKE is empty
    if ( !is_search() || empty( $posts_search ) )
        return $posts_search;

    global $wpdb;
    // Get all of the users of the blog and see if the search query matches either
    // the display name or the user login
    add_filter( \'pre_user_query\', \'db_filter_user_query\' );
    $search = sanitize_text_field( get_query_var( \'s\' ) );
    $args = array(
        \'count_total\' => false,
        \'search\' => sprintf( \'*%s*\', $search ),
        \'search_fields\' => array(
            \'display_name\',
            \'user_login\',
        ),
        \'fields\' => \'ID\',
    );
    $matching_users = get_users( $args );
    remove_filter( \'pre_user_query\', \'db_filter_user_query\' );
    // Don\'t modify the query if there aren\'t any matching users
    if ( empty( $matching_users ) )
        return $posts_search;
    // Take a slightly different approach than core where we want all of the posts from these authors
    $posts_search = str_replace( \')))\', ")) OR ( {$wpdb->posts}.post_author IN (" . implode( \',\', array_map( \'absint\', $matching_users ) ) . ")))", $posts_search );
    return $posts_search;
}
/**
 * Modify get_users() to search display_name instead of user_nicename
 */
function db_filter_user_query( &$user_query ) {

    if ( is_object( $user_query ) )
        $user_query->query_where = str_replace( "user_nicename LIKE", "display_name LIKE", $user_query->query_where );
    return $user_query;
}