Vendor/phpspreadsheet/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Collection/Cells.php
private function getAllCacheKeys()
    {
        $keys = [];
        foreach ($this->getCoordinates() as $coordinate) {
            $keys[] = $this->cachePrefix . $coordinate;
        }

        return $keys;
    }
private function getAllCacheKeys()
    {
        $keys = [];
        foreach ($this->getCoordinates() as $coordinate) {
            $keys[] = $this->cachePrefix . $coordinate;
        }

        return $keys;
    }
Returns all known cache keys.

@return string[]