如果我理解正确，您需要在查询中包含post meta。这就是meta_query 的参数WP_Query 班级来帮忙。这个meta_query 是数组的数组。

法典中的示例：

$args = array(
   \'post_type\' => \'my_custom_post_type\',
   \'meta_key\' => \'age\',
   \'orderby\' => \'meta_value_num\',
   \'order\' => \'ASC\',
   \'meta_query\' => array(
       array(
           \'key\' => \'age\',
           \'value\' => array(3, 4),
           \'compare\' => \'IN\',
       )
   )
 );
 $query = new WP_Query($args);

如果您想直接在$wpdb中查询，可以在搜索中这样做。php：

global $wp_query;
global $wpdb;
global $post; 
$search = sanitize_text_field( $_GET[\'s\']);

$querystr = " 
    SELECT   wposts.ID, wpostmeta. *
    FROM $wpdb->posts AS wposts
            LEFT JOIN $wpdb->postmeta wpostmeta ON (wposts.ID = wpostmeta.post_id)yy
    WHERE wposts.post_status = \'publish\' // all published
    AND wposts.ID NOT IN (\'186\',\'184\' ,\'108\', \'124\', \'78\', \'80\', \'289\') // exclude all these IDs
        AND wpostmeta.meta_key= \'_txt_en\' // Here the customField 
        AND wpostmeta.meta_value LIKE \'%".$search."%\'

     GROUP BY wposts.ID 
    ";





$postids = $wpdb->get_results($querystr,OBJECT);

if ($postids){ 
    foreach ($postids as $post){
        setup_postdata($post);

        echo apply_filters(\'the_content\', get_post_meta($post->ID, \'_txt_en\', true));
    }

}else{
    echo "<p>Sorry, no matches.";

}


}