如何调用WP\\u查询插件初始化并将posts数据保存到$data？

我正在Fatal error: Class \'ms\\WP_Query\' not found 无论我在哪个钩子上调用该方法。即使我这样称呼它add_action(\'shutdown\', array($this, \'get_data\')); 它不起作用(shutdown hook应该是最后一个运行的）或者如果我用短代码调用add_shortcode( \'get_data\', array($get_data, \'get_data\') );

<?php
/*
Plugin Name: Test
Description: Test
Version: 0.1
*/

namespace ms;

if (!defined(\'ABSPATH\')) exit;

class get_data {

    private $data = array();    

    public function __construct(){
        // add_action(\'init\', array($this, \'get_data\'));
    }

    public function get_data() {

        $args = array(
            \'post_type\' => \'post\',
            \'posts_per_page\' => 10
            );

        $query = new WP_Query($args);

        if ( $query->have_posts() ) :
            while ( $query->have_posts() ) : $query->the_post();

                $this->data[] = array(
                    \'title\' => get_the_title()
                );

        endwhile;
        wp_reset_postdata();
        endif;

        var_dump($this->data);

    }

$get_data = new get_data();
add_shortcode( \'get_data\', array($get_data, \'get_data\') );