Neos\Cache\Backend\PdoBackend::rewind PHP Method

    public function rewind()
    {
        if ($this->cacheEntriesIterator === null) {
            $cacheEntries = [];
            $statementHandle = $this->databaseHandle->prepare('SELECT "identifier", "content" FROM "cache" WHERE "context"=? AND "cache"=?' . $this->getNotExpiredStatement());
            $statementHandle->execute(array($this->context, $this->cacheIdentifier));
            $fetchedColumns = $statementHandle->fetchAll();
            foreach ($fetchedColumns as $fetchedColumn) {
                // Convert hexadecimal data into binary string,
                // because it is not allowed to store null bytes in PostgreSQL.
                if ($this->pdoDriver === 'pgsql') {
                    $fetchedColumn['content'] = hex2bin($fetchedColumn['content']);
                }
                $cacheEntries[$fetchedColumn['identifier']] = $fetchedColumn['content'];
            }
            $this->cacheEntriesIterator = new \ArrayIterator($cacheEntries);
        } else {
            $this->cacheEntriesIterator->rewind();
        }
    }