hashtag to tag

<?php
/**
 * @package YD_feedwordpress_content_filter
 * @author Yann Dubois
 * @version 0.2.0
 */

/*
 Plugin Name: YD Feedwordpress content filter
 Plugin URI: http://www.yann.com/en/wp-plugins/yd-feedwordpress-content-filter
 Description: Automatically filters the content of syndicated posts. | Funded by <a href="http://www.abc.fr">ABC.fr</a>
 Version: 0.2.0
 Author: Yann Dubois
 Author URI: http://www.yann.com/
 License: GPL2
 */

/**
 * @copyright 2010  Yann Dubois  ( email : yann _at_ abc.fr )
 *
 *  Original development of this plugin was kindly funded by http://www.abc.fr
 *
 *  Additional developments kindly provided by Alessandro Nuzzo ( http://www.e-one.it )
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

/**
 Revision 0.1.0:
 - Original beta release
 Revision 0.2.0:
 - Refactored using the YD Plugins Framework
 - Added some options
 - Added image attachment hack contributed by Alessandro Nuzzo
 - Added redirected URL resolution
 - Got rid of unused code
 - Small bug fixes
 */

include_once( 'inc/yd-widget-framework.inc.php' );

$junk = new YD_Plugin(
    array(
        'name'              => 'YD Feedwordpress Content Filter',
        'version'           => '0.2.0',
        'has_option_page'   => true,
        'has_shortcode'     => false,
        'has_widget'        => false,
        'widget_class'      => '',
        'has_cron'          => false,
        'crontab'           => array(
            'daily'         => array( 'yd_fwp_filter', 'daily_update' ),
            'hourly'        => array( 'yd_fwp_filter', 'hourly_update' )
        ),
        'has_stylesheet'    => false,
        'stylesheet_file'   => 'css/yd.css',
        'has_translation'   => false,
        'translation_domain'=> '', // must be copied in the widget class!!!
        'translations'      => array(
            array( 'English', 'Yann Dubois', 'http://www.yann.com/' )
        ),
        'initial_funding'   => array( 'Yann.com', 'http://www.yann.com' ),
        'additional_funding'=> array(),
        'form_blocks'       => array(
            'Main options' => array(
                'google_filter' => 'bool',
                'yahoo_filter'  => 'bool',
                'wikio_filter'  => 'bool',
                'local_images'  => 'bool',
                'fix_attach'    => 'bool',
                'fix_first'     => 'bool',
                'fix_redirect'  => 'bool',
                'hash_to_tags'  => 'bool'   // Hashtag
            )
        ),
        'option_field_labels'=>array(
                'google_filter' => 'Apply Google News item filter',
                'yahoo_filter'  => 'Apply Yahoo News item filter',
                'wikio_filter'  => 'Apply Wikio News item filter',
                'local_images'  => 'Import images as local attachments',
                'fix_attach'    => 'Fix attachment IDs',
                'fix_first'     => 'Fix repeated title on first line',
                'fix_redirect'  => 'Resolve redirected source URL',
                'hash_to_tags'  => 'Twitter Hashtags to tags' // Hashtag
        ),
        'option_defaults'   => array(
                'google_filter' => 1,
                'yahoo_filter'  => 1,
                'wikio_filter'  => 1,
                'local_images'  => 1,
                'fix_attach'    => 1,
                'fix_first' => 1,
                'fix_redirect'  => 1,
                'hash_to_tags'  => 1,   // Hashtag
        ),
        'form_add_actions'  => array(
            // no custom actions
        ),
        'has_cache'         => false,
        'option_page_text'  => '',
        'backlinkware_text' => 'Featuring YD Feedwordpress Content Filter Plugin',
        'plugin_file'       => __FILE__
    )
);

class yd_fwp_filter {
    const option_key = 'yd-feedwordpress-content-filter';

    function __construct() {
        $this->yd_fwp_filter();
    }
    function yd_fwp_filter() {
        $options = get_option( self::option_key );
        add_action( 'syndicated_post', array( &$this, 'filter' ), 10, 1 );
        if( $options['fix_attach'] ) {
            add_action( 'post_syndicated_item', array( &$this, 'fixAttach' ), 20, 1 );
            add_action( 'update_syndicated_item', array( &$this, 'fixAttach' ), 20, 1 );
        }
    }
    function filter( $post ) {
        if( !$post ) return $post;
        $options = get_option( self::option_key );

        $content = $post['post_content'];
        $title = $post['post_title'];

        $stripped_content = strip_tags( $content, '<i><sup><sub><strong><u><br><p><img>' ); //<b><em>
        $stripped_content = preg_replace( '|^(<[^>]*>)*(<br\s*\/?>)+|i', "$1", $stripped_content ); // no <br> at beginning (Google)
        $stripped_content = preg_replace( '|<img[^src]+>|i', '', $stripped_content ); // no sourceless <img> (Google)
        $stripped_content = preg_replace( '|(<p\s*>)*\s*et plus encore&nbsp;&raquo;\s*(</p\s*>)*|ims', '', $stripped_content );

        // Hashtag
        if( $options['hash_to_tags'] ) {
            // find hashtags
            preg_match_all( '/\B#(\w*[a-zA-Z-]+\w*)/', $content, $matches );
            $hashtags = $matches[0]; // #bleh
            $tags = $matches[1];     //  bleh
            unset( $matches );
            global $id;
            wp_set_post_tags( $id, implode( ', ', $tags ) );
        }
        // i nice try ^^