Windows Phone App in c#

//get recent post feed
function load_recent_feed()
{ 
  $args = array(
      'numberposts'     => 10,
      'offset'          => 0,
      'category'        => '',
      'orderby'         => 'post_date',
      'order'           => 'DESC',
      'include'         => '',
      'exclude'         => '',
      'meta_key'        => '',
      'meta_value'      => '',
      'post_type'       => 'post',
      'post_mime_type'  => '',
      'post_parent'     => '',
      'post_status'     => 'publish' );


  $recent_posts = get_posts( $args );


  echo '<?xml version="1.0" encoding="UTF-8"?>'; 
?><rss version="2.0"
    xmlns:content="http://purl.org/rss/1.0/modules/content/"
    xmlns:dc="http://purl.org/dc/elements/1.1/"
    xmlns:atom="http://www.w3.org/2005/Atom"
    xmlns:sy="http://purl.org/rss/1.0/modules/syndication/">
    <channel>
      <title><?php bloginfo_rss('name'); wp_title_rss(); ?></title>
      <link><?php bloginfo_rss('url') ?></link>
      <atom:link href="<?php self_link() ?>" rel="self" type="application/rss+xml" />
      <description><?php bloginfo_rss("description") ?></description>
<?php foreach( $recent_posts as $post ){ ?>
      <item>
        <title><?php $title=htmlspecialchars($post->post_title); echo $title; ?></title>
        <author><?php  $user_info = get_userdata($post->post_author);echo $user_info->display_name;  ?></author>
        <description><![CDATA[<?php echo $post->post_content ?>]]></description>
        <tags><?php $category = get_the_category($post->ID); echo $category[0]->cat_name; ?></tags>
        <id><?php echo $post->ID ?></id> 
        <pubDate><?php echo formatDateAndTime($post->post_modified);?></pubDate>
      </item>
<?php } ?> 
  </channel> 
</rss>
<?php }