diff --git a/src/PeratX/SFQRCode/QRCode.php b/src/PeratX/SFQRCode/QRCode.php
index 8110996..b165d80 100644
--- a/src/PeratX/SFQRCode/QRCode.php
+++ b/src/PeratX/SFQRCode/QRCode.php
@@ -19,7 +19,6 @@ class QRCode{
 	public $width;
 	public $data;
 
-
 	public function encodeMask(QRInput $input, $mask){
 		if($input->getVersion() < 0 || $input->getVersion() > SFQRCode::QRSPEC_VERSION_MAX){
 			throw new \Exception('wrong version');
@@ -92,7 +91,6 @@ public function encodeString8bit($string, $version, $level){
 		}
 
 		$input = new QRInput($version, $level);
-		if($input == NULL) return NULL;
 
 		$ret = $input->append(SFQRCode::QR_MODE_8, strlen($string), str_split($string));
 		if($ret < 0){
diff --git a/src/PeratX/SFQRCode/QRMask.php b/src/PeratX/SFQRCode/QRMask.php
index e65d4bb..5d22de8 100644
--- a/src/PeratX/SFQRCode/QRMask.php
+++ b/src/PeratX/SFQRCode/QRMask.php
@@ -18,12 +18,10 @@ class QRMask{
 
 	public $runLength = array();
 
-
 	public function __construct(){
 		$this->runLength = array_fill(0, SFQRCode::QRSPEC_WIDTH_MAX + 1, 0);
 	}
 
-
 	public function writeFormatInformation($width, &$frame, $mask, $level){
 		$blacks = 0;
 		$format = QRSpec::getFormatInfo($mask, $level);
@@ -118,7 +116,6 @@ private function generateMaskNo($maskNo, $width, $frame){
 		return $bitMask;
 	}
 
-
 	public static function serial($bitFrame){
 		$codeArr = array();
 
@@ -128,7 +125,6 @@ public static function serial($bitFrame){
 		return gzcompress(join("\n", $codeArr), 9);
 	}
 
-
 	public static function unserial($code){
 		$codeArr = array();
 
@@ -139,13 +135,12 @@ public static function unserial($code){
 		return $codeArr;
 	}
 
-
 	public function makeMaskNo($maskNo, $width, $s, &$d, $maskGenOnly = false){
 		$b = 0;
 
 		$fileName = SFQRCode::getInstance()->getDataFolder() . 'mask_' . $maskNo . DIRECTORY_SEPARATOR . 'mask_' . $width . '_' . $maskNo . '.dat';
 
-		if(SFQRCode::QR_CACHEABLE){
+		if(SFQRCode::isCacheable()){
 			if(file_exists($fileName)){
 				$bitMask = self::unserial(file_get_contents($fileName));
 			}else{
@@ -176,7 +171,6 @@ public function makeMaskNo($maskNo, $width, $s, &$d, $maskGenOnly = false){
 		return $b;
 	}
 
-
 	public function makeMask($width, $frame, $maskNo, $level){
 		$masked = array_fill(0, $width, str_repeat("\0", $width));
 		$this->makeMaskNo($maskNo, $width, $frame, $masked);
@@ -185,7 +179,6 @@ public function makeMask($width, $frame, $maskNo, $level){
 		return $masked;
 	}
 
-
 	public function calcN1N3($length){
 		$demerit = 0;
 
@@ -214,7 +207,6 @@ public function calcN1N3($length){
 		return $demerit;
 	}
 
-
 	public function evaluateSymbol($width, $frame){
 		$demerit = 0;
 
@@ -280,7 +272,6 @@ public function evaluateSymbol($width, $frame){
 		return $demerit;
 	}
 
-
 	public function mask($width, $frame, $level){
 		$minDemerit = PHP_INT_MAX;
 
@@ -316,6 +307,4 @@ public function mask($width, $frame, $level){
 
 		return $bestMask;
 	}
-
-
 }
diff --git a/src/PeratX/SFQRCode/QRSpec.php b/src/PeratX/SFQRCode/QRSpec.php
index 3a1e19c..6845f28 100644
--- a/src/PeratX/SFQRCode/QRSpec.php
+++ b/src/PeratX/SFQRCode/QRSpec.php
@@ -435,16 +435,14 @@ public static function createFrame($version){
 		return $frame;
 	}
 
-	public static function serial($frame){
+	public static function serialize($frame){
 		return gzcompress(join("\n", $frame), 9);
 	}
 
-
-	public static function unserial($code){
+	public static function deserialize($code){
 		return explode("\n", gzuncompress($code));
 	}
 
-
 	public static function newFrame($version){
 		if($version < 1 || $version > SFQRCode::QRSPEC_VERSION_MAX)
 			return null;
@@ -453,12 +451,12 @@ public static function newFrame($version){
 
 			$fileName = SFQRCode::getInstance()->getDataFolder() . 'frame_' . $version . '.dat';
 
-			if(SFQRCode::QR_CACHEABLE){
+			if(SFQRCode::isCacheable()){
 				if(file_exists($fileName)){
-					self::$frames[$version] = self::unserial(file_get_contents($fileName));
+					self::$frames[$version] = self::deserialize(file_get_contents($fileName));
 				}else{
 					self::$frames[$version] = self::createFrame($version);
-					file_put_contents($fileName, self::serial(self::$frames[$version]));
+					file_put_contents($fileName, self::serialize(self::$frames[$version]));
 				}
 			}else{
 				self::$frames[$version] = self::createFrame($version);
@@ -471,7 +469,6 @@ public static function newFrame($version){
 		return self::$frames[$version];
 	}
 
-
 	public static function rsBlockNum($spec){
 		return $spec[0] + $spec[3];
 	}
diff --git a/src/PeratX/SFQRCode/QRTools.php b/src/PeratX/SFQRCode/QRTools.php
index 9b5d61c..7adead6 100644
--- a/src/PeratX/SFQRCode/QRTools.php
+++ b/src/PeratX/SFQRCode/QRTools.php
@@ -15,7 +15,6 @@
 
 class QRTools{
 
-
 	public static function binarize($frame){
 		$len = count($frame);
 		foreach($frame as &$frameLine){
@@ -28,7 +27,6 @@ public static function binarize($frame){
 		return $frame;
 	}
 
-
 	public static function tcPdfBarcodeArray($code, $mode = 'QR,L'){
 		$barcode_array = array();
 
diff --git a/src/PeratX/SFQRCode/SFQRCode.php b/src/PeratX/SFQRCode/SFQRCode.php
index a881674..d68013f 100644
--- a/src/PeratX/SFQRCode/SFQRCode.php
+++ b/src/PeratX/SFQRCode/SFQRCode.php
@@ -16,7 +16,6 @@
 use PeratX\SimpleFramework\Module\Module;
 
 class SFQRCode extends Module{
-	const QR_CACHEABLE = true;
 	const QR_FIND_BEST_MASK = true;
 	const QR_FIND_FROM_RANDOM = false;
 	const QR_DEFAULT_MASK = 2;
@@ -58,6 +57,8 @@ class SFQRCode extends Module{
 	const QRCAP_REMINDER = 2;
 	const QRCAP_EC = 3;
 
+	private static $cacheable = false;
+
 	private static $obj;
 
 	public function load(){
@@ -65,6 +66,14 @@ public function load(){
 		@mkdir($this->getDataFolder());
 	}
 
+	public static function isCacheable(): bool{
+		return self::$cacheable;
+	}
+
+	public static function setCacheable(bool $cacheable){
+		self::$cacheable = $cacheable;
+	}
+
 	public static function getInstance(): SFQRCode{
 		return self::$obj;
 	}