helper.php

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<?php
/**
* @version		$Id: helper.php 10386 2008-06-01 21:37:15Z pasamio $
* @package		Joomla.Framework
* @subpackage	Language
* @copyright	Copyright (C) 2005 - 2008 Open Source Matters. All rights reserved.
* @license		GNU/GPL, see LICENSE.php
* Joomla! is free software. This version may have been modified pursuant
* to the GNU General Public License, and as distributed it includes or
* is derivative of works licensed under the GNU General Public License or
* other free or open source software licenses.
* See COPYRIGHT.php for copyright notices and details.
*/

// Check to ensure this file is within the rest of the framework
defined('JPATH_BASE') or die();

/**
 * @package 	Joomla.Framework
 * @subpackage		Language
 * @static
 * @since 1.5
 */
class JLanguageHelper
{
	/**
	 * Builds a list of the system languages which can be used in a select option
	 *
	 * @access	public
	 * @param	string	Client key for the area
	 * @param	string	Base path to use
	 * @param	array	An array of arrays ( text, value, selected )
	 * @since	1.5
	 */
	function createLanguageList($actualLanguage, $basePath = JPATH_BASE, $caching = false)
	{
		$list = array ();

		// cache activation
		$langs = JLanguage::getKnownLanguages($basePath);

		foreach ($langs as $lang => $metadata)
		{
			$option = array ();

			$option['text'] = $metadata['name'];
			$option['value'] = $lang;
			if ($lang == $actualLanguage) {
				$option['selected'] = 'selected="selected"';
			}
			$list[] = $option;
		}

		return $list;
	}

	/**
 	 * Tries to detect the language
 	 *
 	 * @access	public
 	 * @return	string locale
 	 * @since	1.5
 	 */
	function detectLanguage()
	{
		if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE']))
		{
			$systemLangs	= JLanguage::getKnownLanguages();
			$browserLangs	= explode( ',', $_SERVER['HTTP_ACCEPT_LANGUAGE'] );

			foreach ($browserLangs as $browserLang)
			{
				// slice out the part before ; on first step, the part before - on second, place into array
				$browserLang = substr( $browserLang, 0, strcspn( $browserLang, ';' ) );
				$primary_browserLang = substr( $browserLang, 0, 2 );

				foreach($systemLangs as $systemLang => $metadata)
				{
					if (strtolower($browserLang) == strtolower(substr($metadata['tag'], 0, strlen($browserLang)))) {
						return $systemLang;
					} elseif ($primary_browserLang == substr($metadata['tag'], 0, 2)) {
						$primaryDetectedLang = $systemLang;
					}
				}

				if (isset($primaryDetectedLang)) {
					return $primaryDetectedLang;
				}
			}
		}

		return 'en-GB';
	}

}