( $cats as $cat ) {
				$struct['categoryId'] = $cat->term_id;
				$struct['parentId'] = $cat->parent;
				$struct['description'] = $cat->name;
				$struct['categoryDescription'] = $cat->description;
				$struct['categoryName'] = $cat->name;
				$struct['htmlUrl'] = esc_html(get_category_link($cat->term_id));
				$struct['rssUrl'] = esc_html(get_category_feed_link($cat->term_id, 'rss2'));

				$categories_struct[] = $struct;
			}
		}

		return $categories_struct;
	}

	/**
	 * Uploads a file, following your settings.
	 *
	 * Adapted from a patch by Johann Richard.
	 *
	 * @link http://mycvs.org/archives/2004/06/30/file-upload-to-wordpress-in-ecto/
	 *
	 * @since 1.5.0
	 *
	 * @param array $args Method parameters.
	 * @return array
	 */
	function mw_newMediaObject($args) {
		global $wpdb;

		$blog_ID     = (int) $args[0];
		$username  = $wpdb->escape($args[1]);
		$password   = $wpdb->escape($args[2]);
		$data        = $args[3];

		$name = sanitize_file_name( $data['name'] );
		$type = $data['type'];
		$bits = $data['bits'];

		logIO('O', '(MW) Received '.strlen($bits).' bytes');

		if ( !$user = $this->login($username, $password) ) {
			return $this->error;
		}

		do_action('xmlrpc_call', 'metaWeblog.newMediaObject');

		if ( !current_user_can('upload_files') ) {
			logIO('O', '(MW) User does not have upload_files capability');
			$this->error = new IXR_Error(401, __('You are not allowed to upload files to this site.'));
			return $this->error;
		}

		if ( $upload_err = apply_filters( "pre_upload_error", false ) )
			return new IXR_Error(500, $upload_err);

		if(!empty($data["overwrite"]) && ($data["overwrite"] == true)) {
			// Get postmeta info on the object.
			$old_file = $wpdb->get_row("
				SELECT ID
				FROM {$wpdb->posts}
				WHERE post_title = '{$name}'
					AND post_type = 'attachment'
			");

			// Delete previous file.
			wp_delete_attachment($old_file->ID);

			// Make sure the new name is different by pre-pending the
			// previous post id.
			$filename = preg_replace("/^wpid\d+-/", "", $name);
			$name = "wpid{$old_file->ID}-{$filename}";
		}

		$upload = wp_upload_bits($name, $type, $bits);
		if ( ! empty($upload['error']) ) {
			$errorString = sprintf(__('Could not write file %1$s (%2$s)'), $name, $upload['error']);
			logIO('O', '(MW) ' . $errorString);
			return new IXR_Error(500, $errorString);
		}
		// Construct the attachment array
		// attach to post_id 0
		$post_id = 0;
		$attachment = array(
			'post_title' => $name,
			'post_content' => '',
			'post_type' => 'attachment',
			'post_parent' => $post_id,
			'post_mime_type' => $type,
			'guid' => $upload[ 'url' ]
		);

		// Save the data
		$id = wp_insert_attachment( $attachment, $upload[ 'file' ], $post_id );
		wp_update_attachment_metadata( $id, wp_generate_attachment_metadata( $id, $upload['file'] ) );

		return apply_filters( 'wp_handle_upload', array( 'file' => $name, 'url' => $upload[ 'url' ], 'type' => $type ) );
	}

	/* MovableType API functions
	 * specs on http://www.movabletype.org/docs/mtmanual_programmatic.html
	 */

	/**
	 * Retrieve the post titles of recent posts.
	 *
	 * @since 1.5.0
	 *
	 * @param array $args Method parameters.
	 * @return array
	 */
	function mt_getRecentPostTitles($args) {

		$this->escape($args);

		$blog_ID     = (int) $args[0];
		$username  = $args[1];
		$password   = $args[2];
		$num_posts   = (int) $args[3];

		if ( !$user = $this->login($username, $password) ) {
			return $this->error;
		}

		do_action('xmlrpc_call', 'mt.getRecentPostTitles');

		$posts_list = wp_get_recent_posts($num_posts);

		if (!$posts_list) {
			$this->error = new IXR_Error(500, __('Either there are no posts, or something went wrong.'));
			return $this->error;
		}

		foreach ($posts_list as $entry) {
			if( !current_user_can( 'edit_post', $entry['ID'] ) )
				continue;

			$post_date = mysql2date('Ymd\TH:i:s', $entry['post_date'], false);
			$post_date_gmt = mysql2date('Ymd\TH:i:s', $entry['post_date_gmt'], false);

			// For drafts use the GMT version of the date
			if ( $entry['post_status'] == 'draft' ) {
				$post_date_gmt = get_gmt_from_date( mysql2date( 'Y-m-d H:i:s', $entry['post_date'] ), 'Ymd\TH:i:s' );
			}

			$struct[] = array(
				'dateCreated' => new IXR_Date($post_date),
				'userid' => $entry['post_author'],
				'postid' => $entry['ID'],
				'title' => $entry['post_title'],
				'date_created_gmt' => new IXR_Date($post_date_gmt)
			);

		}

		$recent_posts = array();
		for ($j=0; $j<count($struct); $j++) {
			array_push($recent_posts, $struct[$j]);
		}

		return $recent_posts;
	}

	/**
	 * Retrieve list of all categories on blog.
	 *
	 * @since 1.5.0
	 *
	 * @param array $args Method parameters.
	 * @return array
	 */
	function mt_getCategoryList($args) {

		$this->escape($args);

		$blog_ID     = (int) $args[0];
		$username  = $args[1];
		$password   = $args[2];

		if ( !$user = $this->login($username, $password) ) {
			return $this->error;
		}

		if( !current_user_can( 'edit_posts' ) )
			return new IXR_Error( 401, __( 'Sorry, you must be able to edit posts on this blog in order to view categories.' ) );

		do_action('xmlrpc_call', 'mt.getCategoryList');

		$categories_struct = array();

		if ( $cats = get_categories('hide_empty=0&hierarchical=0') ) {
			foreach ($cats as $cat) {
				$struct['categoryId'] = $cat->term_id;
				$struct['categoryName'] = $cat->name;

				$categories_struct[] = $struct;
			}
		}

		return $categories_struct;
	}

	/**
	 * Retrieve post categories.
	 *
	 * @since 1.5.0
	 *
	 * @param array $args Method parameters.
	 * @return array
	 */
	function mt_getPostCategories($args) {

		$this->escape($args);

		$post_ID     = (int) $args[0];
		$username  = $args[1];
		$password   = $args[2];

		if ( !$user = $this->login($username, $password) ) {
			return $this->error;
		}

		if( !current_user_can( 'edit_post', $post_ID ) )
			return new IXR_Error( 401, __( 'Sorry, you can not edit this post.' ) );

		do_action('xmlrpc_call', 'mt.getPostCategories');

		$categories = array();
		$catids = wp_get_post_categories(intval($post_ID));
		// first listed category will be the primary category
		$isPrimary = true;
		foreach($catids as $catid) {
			$categories[] = array(
				'categoryName' => get_cat_name($catid),
				'categoryId' => (string) $catid,
				'isPrimary' => $isPrimary
			);
			$isPrimary = false;
		}

		return $categories;
	}

	/**
	 * Sets categories for a post.
	 *
	 * @since 1.5.0
	 *
	 * @param array $args Method parameters.
	 * @return bool True on success.
	 */
	function mt_setPostCategories($args) {

		$this->escape($args);

		$post_ID     = (int) $args[0];
		$username  = $args[1];
		$password   = $args[2];
		$categories  = $args[3];

		if ( !$user = $this->login($username, $password) ) {
			return $this->error;
		}

		do_action('xmlrpc_call', 'mt.setPostCategories');

		if ( !current_user_can('edit_post', $post_ID) )
			return new IXR_Error(401, __('Sorry, you cannot edit this post.'));

		foreach($categories as $cat) {
			$catids[] = $cat['categoryId'];
		}

		wp_set_post_categories($post_ID, $catids);

		return true;
	}

	/**
	 * Retrieve an array of methods supported by this server.
	 *
	 * @since 1.5.0
	 *
	 * @param array $args Method parameters.
	 * @return array
	 */
	function mt_supportedMethods($args) {

		do_action('xmlrpc_call', 'mt.supportedMethods');

		$supported_methods = array();
		foreach($this->methods as $key=>$value) {
			$supported_methods[] = $key;
		}

		return $supported_methods;
	}

	/**
	 * Retrieve an empty array because we don't support per-post text filters.
	 *
	 * @since 1.5.0
	 *
	 * @param array $args Method parameters.
	 */
	function mt_supportedTextFilters($args) {
		do_action('xmlrpc_call', 'mt.supportedTextFilters');
		return apply_filters('xmlrpc_text_filters', array());
	}

	/**
	 * Retrieve trackbacks sent to a given post.
	 *
	 * @since 1.5.0
	 *
	 * @param array $args Method parameters.
	 * @return mixed
	 */
	function mt_getTrackbackPings($args) {

		global $wpdb;

		$post_ID = intval($args);

		do_action('xmlrpc_call', 'mt.getTrackbackPings');

		$actual_post = wp_get_single_post($post_ID, ARRAY_A);

		if (!$actual_post) {
			return new IXR_Error(404, __('Sorry, no such post.'));
		}

		$comments = $wpdb->get_results( $wpdb->prepare("SELECT comment_author_url, comment_content, comment_author_IP, comment_type FROM $wpdb->comments WHERE comment_post_ID = %d", $post_ID) );

		if (!$comments) {
			return array();
		}

		$trackback_pings = array();
		foreach($comments as $comment) {
			if ( 'trackback' == $comment->comment_type ) {
				$content = $comment->comment_content;
				$title = substr($content, 8, (strpos($content, '</strong>') - 8));
				$trackback_pings[] = array(
					'pingTitle' => $title,
					'pingURL'   => $comment->comment_author_url,
					'pingIP'    => $comment->comment_author_IP
				);
		}
		}

		return $trackback_pings;
	}

	/**
	 * Sets a post's publish status to 'publish'.
	 *
	 * @since 1.5.0
	 *
	 * @param array $args Method parameters.
	 * @return int
	 */
	function mt_publishPost($args) {

		$this->escape($args);

		$post_ID     = (int) $args[0];
		$username  = $args[1];
		$password   = $args[2];

		if ( !$user = $this->login($username, $password) ) {
			return $this->error;
		}

		do_action('xmlrpc_call', 'mt.publishPost');

		if ( !current_user_can('edit_post', $post_ID) )
			return new IXR_Error(401, __('Sorry, you cannot edit this post.'));

		$postdata = wp_get_single_post($post_ID,ARRAY_A);

		$postdata['post_status'] = 'publish';

		// retain old cats
		$cats = wp_get_post_categories($post_ID);
		$postdata['post_category'] = $cats;
		$this->escape($postdata);

		$result = wp_update_post($postdata);

		return $result;
	}

	/* PingBack functions
	 * specs on www.hixie.ch/specs/pingback/pingback
	 */

	/**
	 * Retrieves a pingback and registers it.
	 *
	 * @since 1.5.0
	 *
	 * @param array $args Method parameters.
	 * @return array
	 */
	function pingback_ping($args) {
		global $wpdb;

		do_action('xmlrpc_call', 'pingback.ping');

		$this->escape($args);

		$pagelinkedfrom = $args[0];
		$pagelinkedto   = $args[1];

		$title = '';

		$pagelinkedfrom = str_replace('&amp;', '&', $pagelinkedfrom);
		$pagelinkedto = str_replace('&amp;', '&', $pagelinkedto);
		$pagelinkedto = str_replace('&', '&amp;', $pagelinkedto);

		// Check if the page linked to is in our site
		$pos1 = strpos($pagelinkedto, str_replace(array('http://www.','http://','https://www.','https://'), '', get_option('home')));
		if( !$pos1 )
			return new IXR_Error(0, __('Is there no link to us?'));

		// let's find which post is linked to
		// FIXME: does url_to_postid() cover all these cases already?
		//        if so, then let's use it and drop the old code.
		$urltest = parse_url($pagelinkedto);
		if ($post_ID = url_to_postid($pagelinkedto)) {
			$way = 'url_to_postid()';
		} elseif (preg_match('#p/[0-9]{1,}#', $urltest['path'], $match)) {
			// the path defines the post_ID (archives/p/XXXX)
			$blah = explode('/', $match[0]);
			$post_ID = (int) $blah[1];
			$way = 'from the path';
		} elseif (preg_match('#p=[0-9]{1,}#', $urltest['query'], $match)) {
			// the querystring defines the post_ID (?p=XXXX)
			$blah = explode('=', $match[0]);
			$post_ID = (int) $blah[1];
			$way = 'from the querystring';
		} elseif (isset($urltest['fragment'])) {
			// an #anchor is there, it's either...
			if (intval($urltest['fragment'])) {
				// ...an integer #XXXX (simpliest case)
				$post_ID = (int) $urltest['fragment'];
				$way = 'from the fragment (numeric)';
			} elseif (preg_match('/post-[0-9]+/',$urltest['fragment'])) {
				// ...a post id in the form 'post-###'
				$post_ID = preg_replace('/[^0-9]+/', '', $urltest['fragment']);
				$way = 'from the fragment (post-###)';
			} elseif (is_string($urltest['fragment'])) {
				// ...or a string #title, a little more complicated
				$title = preg_replace('/[^a-z0-9]/i', '.', $urltest['fragment']);
				$sql = $wpdb->prepare("SELECT ID FROM $wpdb->posts WHERE post_title RLIKE %s", $title);
				if (! ($post_ID = $wpdb->get_var($sql)) ) {
					// returning unknown error '0' is better than die()ing
			  		return new IXR_Error(0, '');
				}
				$way = 'from the fragment (title)';
			}
		} else {
			// TODO: Attempt to extract a post ID from the given URL
	  		return new IXR_Error(33, __('The specified target URL cannot be used as a target. It either doesn&#8217;t exist, or it is not a pingback-enabled resource.'));
		}
		$post_ID = (int) $post_ID;


		logIO("O","(PB) URL='$pagelinkedto' ID='$post_ID' Found='$way'");

		$post = get_post($post_ID);

		if ( !$post ) // Post_ID not found
	  		return new IXR_Error(33, __('The specified target URL cannot be used as a target. It either doesn&#8217;t exist, or it is not a pingback-enabled resource.'));

		if ( $post_ID == url_to_postid($pagelinkedfrom) )
			return new IXR_Error(0, __('The source URL and the target URL cannot both point to the same resource.'));

		// Check if pings are on
		if ( !pings_open($post) )
	  		return new IXR_Error(33, __('The specified target URL cannot be used as a target. It either doesn&#8217;t exist, or it is not a pingback-enabled resource.'));

		// Let's check that the remote site didn't already pingback this entry
		$wpdb->get_results( $wpdb->prepare("SELECT * FROM $wpdb->comments WHERE comment_post_ID = %d AND comment_author_url = %s", $post_ID, $pagelinkedfrom) );

		if ( $wpdb->num_rows ) // We already have a Pingback from this URL
	  		return new IXR_Error(48, __('The pingback has already been registered.'));

		// very stupid, but gives time to the 'from' server to publish !
		sleep(1);

		// Let's check the remote site
		$linea = wp_remote_fopen( $pagelinkedfrom );
		if ( !$linea )
	  		return new IXR_Error(16, __('The source URL does not exist.'));

		$linea = apply_filters('pre_remote_source', $linea, $pagelinkedto);

		// Work around bug in strip_tags():
		$linea = str_replace('<!DOC', '<DOC', $linea);
		$linea = preg_replace( '/[\s\r\n\t]+/', ' ', $linea ); // normalize spaces
		$linea = preg_replace( "/ <(h1|h2|h3|h4|h5|h6|p|th|td|li|dt|dd|pre|caption|input|textarea|button|body)[^>]*>/", "\n\n", $linea );

		preg_match('|<title>([^<]*?)</title>|is', $linea, $matchtitle);
		$title = $matchtitle[1];
		if ( empty( $title ) )
			return new IXR_Error(32, __('We cannot find a title on that page.'));

		$linea = strip_tags( $linea, '<a>' ); // just keep the tag we need

		$p = explode( "\n\n", $linea );

		$preg_target = preg_quote($pagelinkedto, '|');

		foreach ( $p as $para ) {
			if ( strpos($para, $pagelinkedto) !== false ) { // it exists, but is it a link?
				preg_match("|<a[^>]+?".$preg_target."[^>]*>([^>]+?)</a>|", $para, $context);

				// If the URL isn't in a link context, keep looking
				if ( empty($context) )
					continue;

				// We're going to use this fake tag to mark the context in a bit
				// the marker is needed in case the link text appears more than once in the paragraph
				$excerpt = preg_replace('|\</?wpcontext\>|', '', $para);

				// prevent really long link text
				if ( strlen($context[1]) > 100 )
					$context[1] = substr($context[1], 0, 100) . '...';

				$marker = '<wpcontext>'.$context[1].'</wpcontext>';    // set up our marker
				$excerpt= str_replace($context[0], $marker, $excerpt); // swap out the link for our marker
				$excerpt = strip_tags($excerpt, '<wpcontext>');        // strip all tags but our context marker
				$excerpt = trim($excerpt);
				$preg_marker = preg_quote($marker, '|');
				$excerpt = preg_replace("|.*?\s(.{0,100}$preg_marker.{0,100})\s.*|s", '$1', $excerpt);
				$excerpt = strip_tags($excerpt); // YES, again, to remove the marker wrapper
				break;
			}
		}

		if ( empty($context) ) // Link to target not found
			return new IXR_Error(17, __('The source URL does not contain a link to the target URL, and so cannot be used as a source.'));

		$pagelinkedfrom = str_replace('&', '&amp;', $pagelinkedfrom);

		$context = '[...] ' . esc_html( $excerpt ) . ' [...]';
		$pagelinkedfrom = $wpdb->escape( $pagelinkedfrom );

		$comment_post_ID = (int) $post_ID;
		$comment_author = $title;
		$this->escape($comment_author);
		$comment_author_url = $pagelinkedfrom;
		$comment_content = $context;
		$this->escape($comment_content);
		$comment_type = 'pingback';

		$commentdata = compact('comment_post_ID', 'comment_author', 'comment_author_url', 'comment_content', 'comment_type');

		$comment_ID = wp_new_comment($commentdata);
		do_action('pingback_post', $comment_ID);

		return sprintf(__('Pingback from %1$s to %2$s registered. Keep the web talking! :-)'), $pagelinkedfrom, $pagelinkedto);
	}

	/**
	 * Retrieve array of URLs that pingbacked the given URL.
	 *
	 * Specs on http://www.aquarionics.com/misc/archives/blogite/0198.html
	 *
	 * @since 1.5.0
	 *
	 * @param array $args Method parameters.
	 * @return array
	 */
	function pingback_extensions_getPingbacks($args) {

		global $wpdb;

		do_action('xmlrpc_call', 'pingback.extensions.getPingbacks');

		$this->escape($args);

		$url = $args;

		$post_ID = url_to_postid($url);
		if (!$post_ID) {
			// We aren't sure that the resource is available and/or pingback enabled
	  		return new IXR_Error(33, __('The specified target URL cannot be used as a target. It either doesn&#8217;t exist, or it is not a pingback-enabled resource.'));
		}

		$actual_post = wp_get_single_post($post_ID, ARRAY_A);

		if (!$actual_post) {
			// No such post = resource not found
	  		return new IXR_Error(32, __('The specified target URL does not exist.'));
		}

		$comments = $wpdb->get_results( $wpdb->prepare("SELECT comment_author_url, comment_content, comment_author_IP, comment_type FROM $wpdb->comments WHERE comment_post_ID = %d", $post_ID) );

		if (!$comments) {
			return array();
		}

		$pingbacks = array();
		foreach($comments as $comment) {
			if ( 'pingback' == $comment->comment_type )
				$pingbacks[] = $comment->comment_author_url;
		}

		return $pingbacks;
	}
}

$wp_xmlrpc_server = new wp_xmlrpc_server();
$wp_xmlrpc_server->serve_request();
?>