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Script timeouts while trying to add large amount of rows
public function generateQrCodes($program_id = null, $amount = 10000)
    {
        //add entries into database & generate QR images
        for ($i = 1; $i++; $i <= $amount) {
            $this->_createQr($program_id, $i);
        }

        //generate ZIP file
    }

    private function _createQr($program_id, $number)
    {
        //save into database
        $this->create();
        $this->data['Qrcode']['program_id'] = $program_id;
        $this->data['Qrcode']['qr'] = $number;
        $saved = $this->save();

        if ($saved) {
            $this->_createQrImage($program_id, $number);
            return true;
        } else {
            return false;
        }
    }