/**
 * Summarize numbers to ranges by keys ['vinicola'=>'Torres', 'variaety'=>'merlot', 'vintage'=>'2010-2015, 2018']
 *
 *
 * @precondition $data orderd by ['key_1', 'key_2', ... 'int']
 * @param array $keys ['key_1', 'key_2', ..]
 * @param string $rangeKey key to an integer to summarize by range
 * @param array $data [['key_1'=>'a', 'key_2', 'int'=>2014], ['key_1'=>'a', 'key_2', 'int'=>2015],...]
 * @param bool $md5Key true use md5 for hashkey, uses key_1\tkey_2\t...
 * @return array ['key_1\tkey_2\t'=>['key_1'=>'Winery 1' 'key_2' => 'merlot' => 'vintage'=>'2010-2014, 2015-2016, 2018'], ...]
 */
 function iaNumbers2Ranges($keys, $rangeKey, $data, $md5Key=false) {
    $joinWith = '-'; // I think it's better to put n-dash symbol (U+2013) without spaces on sides.
    $separateBy = ', ';
    $changed = 0;
    $prevHash = [];
    $sumarized = [];
    $keyExtractor = array_flip($keys);
    foreach($data as $d) {
        $part = array_intersect_key($d, $keyExtractor);
        $hash = implode("\t", array_intersect_key($d, $part) );
        if($md5Key) {
            $hash = md5($hash);
        }
        if(!isset($sumarized[$hash])) {
            $sumarized[$hash] = $part;
        }
        if(!isset($d[$rangeKey])) {
            if(!isset($sumarized[$hash][$rangeKey])) {
                $sumarized[$hash][$rangeKey] = '';
            }
            continue;
        }
        $value = $d[$rangeKey];
        if(!isset($prevHash[$hash])) {
            $sumarized[$hash][$rangeKey] = $value;
            $prevHash[$hash] = is_numeric($value) ? (int)$value : $value;
            continue;
        }
        $prevTop = $prevHash[$hash];
        if(!is_numeric($value) || !is_numeric($prevTop)) {
            $sumarized[$hash][$rangeKey] .= $separateBy.$value;
        } elseif( $prevTop + 1 == $value) {
            $sumarized[$hash][$rangeKey] = str_replace($joinWith.$prevTop, $joinWith.$value, $sumarized[$hash][$rangeKey], $changed);
            if($changed === 0) {
                $sumarized[$hash][$rangeKey] .= $joinWith.$value;
            }
        } else {
            $sumarized[$hash][$rangeKey] .= $separateBy.$value;
        }
        $prevHash[$hash] = is_numeric($value) ? (int)$value : $value;
    }
    return $sumarized;
}