PDO issue (null values)

        $updatQuery = $this->dbh->prepare($query);

        $paramsUTF8 = array_map('utf8_decode', array_values($paramsForQuery)); // I have french characters, that's why

        $count = 1;
        foreach ($paramsUTF8 as $p) {
            $typeBind = \PDO::PARAM_STR;
            $typeBindString = 'string'; // used for displaying the log

            if (strtolower($p) == 'null') {
                $typeBind = \PDO::PARAM_NULL;
                $typeBindString = 'null';
            }
            else if (is_int($p)) {
                $typeBind = \PDO::PARAM_INT;
                $typeBindString = 'int';
            }
            else if (is_string($p)) {
                $typeBind = \PDO::PARAM_STR;
                $typeBindString = 'string';
            }

            $this->logger->logThis('BIND [' . $count . '] ==> ' . $p . ' [typeBind : ' . $typeBindString . ']');

            $updatQuery->bindValue($count, $p, $typeBind);
            $count++;
        }

        if ($updatQuery->execute()) {
            $this->logger->logThis('OK - it's working');
            return true;
        }
        else {
            $this->logger->logThis("F*** this! I'm going home!");
        }
        return false;