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Name File: 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   object            &$form     The form object for which the field is being tested.
	 *
	 * @return  boolean  True if the value is valid, false otherwise.
	 *
	 * @since   11.1
	 * @throws  JException on invalid rule.
	 */
	public function test(&$element, $value, $group = null, &$input = null, &$form = null)
	{
		// Get the database object and a new query object.
		$db = JFactory::getDBO();
		$query = $db->getQuery(true);

		// Build the query.
		$query->select('COUNT(*)');
		$query->from('#__users');
		$query->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();

		// Check for a database error.
		if ($db->getErrorNum())
		{
			JError::raiseWarning(500, $db->getErrorMsg());
		}

		if ($duplicate)
		{
			return false;
		}

		return true;
	}
}