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/home/develito/httpdocs/libraries/cms/html/adminlanguage.php

<?php
/**
 * @package     Joomla.Libraries
 * @subpackage  HTML
 *
 * @copyright   (C) 2017 Open Source Matters, Inc. <https://www.joomla.org>
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */

defined('JPATH_PLATFORM') or die;

/**
 * Utility class working with administrator language select lists
 *
 * @since  3.8.0
 */
abstract class JHtmlAdminLanguage
{
	/**
	 * Cached array of the administrator language items.
	 *
	 * @var    array
	 * @since  3.8.0
	 */
	protected static $items = null;

/**
	 * Get a list of the available administrator language items.
	 *
	 * @param   boolean  $all        True to include All (*)
	 * @param   boolean  $translate  True to translate All
	 *
	 * @return  string
	 *
	 * @since   3.8.0
	 */
	public static function existing($all = false, $translate = false)
	{
		if (empty(static::$items))
		{
			$languages       = array();
			$admin_languages = JLanguageHelper::getKnownLanguages(JPATH_ADMINISTRATOR);

foreach ($admin_languages as $tag => $language)
			{
				$languages[$tag] = $language['nativeName'];
			}

ksort($languages);

static::$items = $languages;
		}

if ($all)
		{
			$all_option = array(new JObject(array('value' => '*', 'text' => $translate ? JText::alt('JALL', 'language') : 'JALL_LANGUAGE')));

return array_merge($all_option, static::$items);
		}
		else
		{
			return static::$items;
		}
	}
}