class.ilLanguageDetection.php

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<?php
/* Copyright (c) 1998-2015 ILIAS open source, Extended GPL, see docs/LICENSE */

require_once 'Services/Language/classes/class.ilLanguage.php';
require_once 'Services/Language/classes/class.ilLanguageDetectorFactory.php';

class ilLanguageDetection
{
        protected $factory;

        public function __construct()
        {
                $this->factory  = new ilLanguageDetectorFactory();
        }

        public function detect()
        {
                global $ilLog;

                $installed_languages = ilLanguage::_getInstalledLanguages();
                $detected_language   = $installed_languages[0];

                foreach($this->factory->getValidInstances() as $detector)
                {
                        try
                        {
                                $language = $detector->getIso2LanguageCode();
                                if(in_array($language, $installed_languages))
                                {
                                        $detected_language = $language;
                                }
                        }
                        catch(ilLanguageException $e)
                        {
                                $ilLog->write(__METHOD__ . ' ' . $e->getMessage());
                        }
                }

                return $detected_language;
        }
}