EC-CUBE4のサイトにWordPressの投稿一覧を表示する方法

<?php 
$webroot = $_SERVER['DOCUMENT_ROOT'];
require ($webroot.'/wp/wp-load.php');
?>
 
<section>
   <h2>新着情報</h2>
   <?php
      $args = array(
         'posts_per_page' => 5,
         'post_type' => 'post'
      );
      $posts = get_posts($args);
   ?>
   <?php if($posts): ?>
   <ul>
      <?php foreach($posts as $key => $post): setup_postdata($post); ?>
      <li>
         <a href="<?php the_permalink(); ?>">
            <?php the_title(); ?>
         </a>
      </li>
      <?php endforeach; ?>
   </ul>
   <?php endif; ?>
   <?php wp_reset_postdata(); ?>
</section>

{% set home_url = url('homepage') %}
{% set news_path = asset('/html/template/default/assets/php/wp_news.php') %}
{% set news_url = home_url~news_path %}
{{ php_file_get_contents(news_url) }}

{% set home_url = url('homepage') %}
{% set news_path = asset('/html/template/default/assets/php/wp_news.php') %}
{% set news_url = home_url~news_path %}
 
{% set basic = ['User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100','Authorization: Basic ' ~ php_base64_encode('id:password')] %}
{% set options = {'http': {'header' : php_implode("\r\n", basic )}} %}
 
{{ php_file_get_contents(news_url, false, php_stream_context_create(options)) }}

new \Twig_SimpleFunction('php_*', array($this,'phpFunctions'),array('is_safe' => array('html'))),

public function phpFunctions()
{
    $arg_list = func_get_args();
    $function = array_shift($arg_list);
 
    if(is_callable($function)){
        return call_user_func_array($function, $arg_list);
    }
 
    $errMsg = 'Called to an undefined function : <b>php_' . $function . "</b> ";
    trigger_error($errMsg, E_USER_NOTICE);
    return NULL;
}