我向WordPress添加了一个自定义端点，如下所示：

add_action( \'rest_api_init\', function () {
    register_rest_route( \'menc/v1\', \'/crosscat/(?P[\\w-]+)/(?P[\\w-]+)\', array(
        \'methods\' => \'GET\',
        \'callback\' => \'dept_cat_api\',
        \'args\' => array(
            \'dept\' => array(
                \'sanitize_callback\' => function($param, $request, $key) {
                    return sanitize_text_field( $param );
                }
            ),
            \'cat\' => array(
                \'sanitize_callback\' => function($param, $request, $key) {
                    return sanitize_text_field( $param );
                }
            ),
        ),
    ) );
} );

function dept_cat_api( $data ) {
    $args = array(
        \'post_type\' => \'post\',
        \'tax_query\' => array(
            \'relation\' => \'AND\',
            array(
                \'taxonomy\' => \'crosspost\',
                \'field\'    => \'slug\',
                \'terms\'    => array( $data[\'dept\'] ),
            ),
            array(
                \'taxonomy\' => \'category\',
                \'field\'    => \'slug\',
                \'terms\'    => array( $data[\'cat\'] ),
            ),
        ),
    );

    $posts = get_posts( $args );

    if ( empty( $posts ) ) 
        return new WP_Error( \'no_posts\', \'Invalid term(s)\', array( \'status\' => 404 ) );

    $controller = new WP_REST_Posts_Controller(\'post\');
    $response = array();
    foreach ( $posts as $post ) {
        $data    = $controller->prepare_item_for_response( $post, $data );
        $response[] = $controller->prepare_response_for_collection( $data );
    }

    // return results
    return new WP_REST_Response($response, 200);

}

cherry根据特定自定义分类法中类别和术语的交集来挑选帖子。在我的本地开发环境中，这会返回我期望的帖子或404响应。在生产上，它返回500 http错误，错误日志报告

PHP致命错误：无法将WP\\u REST\\u Response类型的对象用作/WP includes/REST api/endpoints/class WP REST posts控制器中的数组。php在线1554

我不确定这是否是服务器问题，或者是否有我看不到的错误。一个做同样事情的类似函数，使用标签而不是类别，效果很好。

function dept_cat_api( $request ) {
$args = array(
    \'post_type\' => \'post\',
    \'tax_query\' => array(
        \'relation\' => \'AND\',
        array(
            \'taxonomy\' => \'crosspost\',
            \'field\'    => \'slug\',
            \'terms\'    => array( $request[\'dept\'] ),
        ),
        array(
            \'taxonomy\' => \'category\',
            \'field\'    => \'slug\',
            \'terms\'    => array( $request[\'cat\'] ),
        ),
    ),
);

$posts = get_posts( $args );

if ( empty( $posts ) ) return new WP_Error( \'no_posts\', \'Invalid term(s)\', array( \'status\' => 404 ) );

$controller = new WP_REST_Posts_Controller(\'post\');

foreach ( $posts as $post ) {
    $response = $controller->prepare_item_for_response( $post, $request );
    $data[] = $controller->prepare_response_for_collection( $response );
}

// return results
return new WP_REST_Response($data, 200);

}