/* Adding custom user profile meta data in Wordpress */
/* You can add this to an existing plugin or create your own plugin */

class custom_user_meta {

  function custom_user_meta() {

    add_action('show_user_profile', array(&$this,'action_show_user_profile'));
    add_action('edit_user_profile', array(&$this,'action_show_user_profile'));
    add_action('personal_options_update', array(&$this,'action_process_option_update'));
    add_action('edit_user_profile_update', array(&$this,'action_process_option_update'));

  }

  function action_show_user_profile() {
    global $user_id;
    ?>
    <h3><?php _e('E-mail'); ?></h3>

    <table class="form-table">

      <tr>
        <th><?php _e('Latest News'); ?></th>

  <?php
    $email_array = get_the_author_meta('e_preference',$user_id);
  ?>      
        <td>
        <label for="news"><input type="checkbox" value="news" name="e_preference[]" id="news" <?php if (is_array($email_array)) { if (in_array("news",$email_array)) { ?>checked="checked"<?php } }?> class="news" /> E-mail updates and news.</label>
        </td>
      </tr>  
      <tr>
        <th><?php _e('Notification'); ?></th>
        
        <td>
        <label for="notify"><input type="checkbox" value="notify" name="e_preference[]" id="notify" <?php if (is_array($email_array)) { if (in_array("notify",$email_array)) { ?>checked="checked"<?php } }?> class="notify" /> Receive important notification.</label>
        </td>
      </tr>
    </table>
  <?php
  }

  
  function action_process_option_update() {
    global $user_id;
    
    update_usermeta( $user_id, 'e_preference', ( isset($_POST['e_preference']) ? $_POST['e_preference'] : '' ) );
  }

}

add_action('plugins_loaded', create_function('','global $custom_user_meta_instance; $custom_user_meta_instance = new custom_user_meta();'));