username.php

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<?php
/**
 * @package     Joomla.Platform
 * @subpackage  Form
 *
 * @copyright   Copyright (C) 2005 - 2013 Open Source Matters, Inc. All rights reserved.
 * @license     GNU General Public License version 2 or later; see LICENSE
 */

defined('JPATH_PLATFORM') or die;

/**
 * Form Rule class for the Joomla Platform.
 *
 * @package     Joomla.Platform
 * @subpackage  Form
 * @since       11.1
 */
class JFormRuleUsername extends JFormRule
{
        /**
         * Method to test the username for uniqueness.
         *
         * @param   SimpleXMLElement  $element  The SimpleXMLElement object representing the <field /> tag for the form field object.
         * @param   mixed             $value    The form field value to validate.
         * @param   string            $group    The field name group control value. This acts as as an array container for the field.
         *                                      For example if the field has name="foo" and the group value is set to "bar" then the
         *                                      full field name would end up being "bar[foo]".
         * @param   JRegistry         $input    An optional JRegistry object with the entire data set to validate against the entire form.
         * @param   JForm             $form     The form object for which the field is being tested.
         *
         * @return  boolean  True if the value is valid, false otherwise.
         *
         * @since   11.1
         */
        public function test(SimpleXMLElement $element, $value, $group = null, JRegistry $input = null, JForm $form = null)
        {
                // Get the database object and a new query object.
                $db = JFactory::getDbo();
                $query = $db->getQuery(true);

                // Build the query.
                $query->select('COUNT(*)')
                        ->from('#__users')
                        ->where('username = ' . $db->quote($value));

                // Get the extra field check attribute.
                $userId = ($form instanceof JForm) ? $form->getValue('id') : '';
                $query->where($db->quoteName('id') . ' <> ' . (int) $userId);

                // Set and query the database.
                $db->setQuery($query);
                $duplicate = (bool) $db->loadResult();

                if ($duplicate)
                {
                        return false;
                }

                return true;
        }
}