PrivateBin\I18n::_getMatchingLanguage PHP Method

    protected static function _getMatchingLanguage($acceptedLanguages, $availableLanguages)
    {
        $matches = array();
        $any = false;
        foreach ($acceptedLanguages as $acceptedQuality => $acceptedValues) {
            $acceptedQuality = floatval($acceptedQuality);
            if ($acceptedQuality === 0.0) {
                continue;
            }
            foreach ($availableLanguages as $availableValue) {
                $availableQuality = 1.0;
                foreach ($acceptedValues as $acceptedValue) {
                    if ($acceptedValue === '*') {
                        $any = true;
                    }
                    $matchingGrade = self::_matchLanguage($acceptedValue, $availableValue);
                    if ($matchingGrade > 0) {
                        $q = (string) ($acceptedQuality * $availableQuality * $matchingGrade);
                        if (!isset($matches[$q])) {
                            $matches[$q] = array();
                        }
                        if (!in_array($availableValue, $matches[$q])) {
                            $matches[$q][] = $availableValue;
                        }
                    }
                }
            }
        }
        if (count($matches) === 0 && $any) {
            if (count($availableLanguages) > 0) {
                $matches['1.0'] = $availableLanguages;
            }
        }
        if (count($matches) === 0) {
            return self::$_languageFallback;
        }
        krsort($matches);
        $topmatches = current($matches);
        return current($topmatches);
    }