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/**
 * Makes correct plural forms of words
 * 
 * @global string $lang Current language
 * @param int $digit Numeric value
 * @param string $expr Word or expression
 * @param bool $onlyword Return only words, without numbers
 * @param bool $canfrac - Numeric value can be Decimal Fraction
 * @return string 
 */
function sed_declension($digit, $expr, $onlyword = false, $canfrac = false)
{
    if (!is_array($expr))
    {
        return trim(($onlyword ? '' : "$digit ") . $expr);
    }

    global $lang;

	if ($canfrac)
	{
	$is_frac = floor($digit) != $digit;
	$i = $digit;
	}
	else
	{
	$i = preg_replace('#\D+#', '', $digit);
	}

    $plural = sed_get_plural($i, $lang, $is_frac);
    $cnt = count($expr);
    return trim(($onlyword ? '' : "$digit ") . (($cnt > 0 && $plural < $cnt) ? $expr[$plural] : ''));
}

/**
 * Used in sed_declension to get rules for concrete languages
 * 
 * @param int $plural Numeric value
 * @param string $lang Target language code
 * @return int 
 */
function sed_get_plural($plural, $lang, $is_frac = false)
{
    switch ($lang)
    {
        case 'en':
        case 'de':
        case 'nl':
        case 'se':
            return ($plural == 1) ? 1 : 0;
 
        case 'fr':
        case 'uk':
            return ($plural > 1) ? 0 : 1;
 
        case 'ru':
        case 'ua':
			if ($is_frac)
			{
				return 1;
			}
            $plural %= 100;
            return (5 <= $plural && $plural <= 20) ? 2 : ((1 == ($plural %= 10)) ? 0 : ((2 <= $plural && $plural <= 4) ? 1 : 2));

        default:
            return 0;
    }
}