class.ilHttpRequestsLanguageDetector.php

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

require_once 'Services/Language/interfaces/interface.ilLanguageDetector.php';

class ilHttpRequestsLanguageDetector implements ilLanguageDetector
{
        protected $header_value;

        public function __construct($header_value)
        {
                $this->header_value = $header_value;
        }

        public function getIso2LanguageCode()
        {
                if(strlen($this->header_value))
                {
                        $matches  = array();
                        // Format: de,de-DE;q=0.8,en-US;q=0.6,en;q=0.4
                        preg_match_all('/([a-z]{1,8}(-[a-z]{1,8})?)\s*(;\s*q\s*=\s*(1|0\.[0-9]+))?/i', $this->header_value, $matches);
                        if(count($matches[1]))
                        {
                                $langs = array_combine($matches[1], $matches[4]);
                                foreach($langs as $lang => $val)
                                {
                                        if($val === '')
                                        {
                                                $langs[$lang] = 1;
                                        }
                                }

                                arsort($langs, SORT_NUMERIC);

                                $keys = array_keys($langs);
                                if(isset($keys[0]))
                                {
                                        return substr($keys[0], 0, 2);
                                }
                        }
                }

                require_once 'Services/Language/exceptions/class.ilLanguageException.php';
                throw new ilLanguageException('Could not extract any language information from request.');
        }
}