src/Web/Sessions/CachedSessionHandler.php
public function extractData($sessionRecord = [], $unserialize = false) {
        $data = isset($sessionRecord[$this->dataKey]) ? $sessionRecord[$this->dataKey] : [];
        return $unserialize && is_string($data) ? $this->unserializeData($data) : $data;
    }
public function extractData($sessionRecord = [], $unserialize = false) {
        $data = isset($sessionRecord[$this->dataKey]) ? $sessionRecord[$this->dataKey] : [];
        return $unserialize && is_string($data) ? $this->unserializeData($data) : $data;
    }
Extract session data from record
@param array $sessionRecord
@param bool  $unserialize
@return array