问题不再相关。。

首先，我考虑了关系或/和的结果，但我认为我应该使用“operator”=>“NOT IN”。我想查询符合多个分类法的结果，而不是显示符合1个税的所有结果。New question has been made.

<?php 
function page_content($filters, $is_search = false,  $pg = 1, $cat = -1, $post_type) {

if (!$is_search) {
$filters = explode(\',\', $filters);
$query_args = array(
    \'posts_per_page\' => 30,
    \'post_type\'      => $post_type,
    \'post_status\'    => \'publish\',
    \'paged\'          => $pg 
);

$terms = array();
foreach ($filters as $f) {
    if (!empty($f) && is_numeric($f) && $f > 0) {
    $terms[] = $f;
}}

if (!empty($terms)) {
            if (!is_array($query_args[\'tax_query\'])) $query_args[\'tax_query\'] = array();
            $query_args[\'tax_query\'] = array(
\'relation\' => \'OR\', // NOT WORKING, STILL SHOWS \'AND\' RESULTS
array(
                \'taxonomy\' => $post_type . \'_filters\',
                \'terms\'    => $terms,
                \'field\'    => \'id\',         
            ));
        }

$queried_items = new WP_Query($query_args);
} else {
global $wp_query;
$queried_items = $wp_query;
}

foreach ($queried_items->posts as $p) {
$taxonomy = str_replace(\'%#%\', $p->post_type, \'%#%_filters\');
$p->taxonomy = array();
$pfields = array("fields" => "all");
$terms = wp_get_post_terms($p->ID, $taxonomy, $pfields);
$assgined_terms = array();
if ($terms && is_array($terms) && !empty($terms)) {
    foreach ($terms as $term) {
if (!in_array($term->parent, $assgined_terms)) {
    $p->taxonomy[] = $term;
    array_push($assgined_terms, $term->parent);
}}  }
}}