:octocat: +backslashes for built-in functions

src/Data/AlphaNum.php

@@ -51,13 +51,13 @@ class AlphaNum extends QRDataAbstract{
 	 * @throws \chillerlan\QRCode\Data\QRCodeDataException
 	 */
 	protected function getCharCode(string $chr):int{
-		$i = array_search($chr, $this::ALPHANUM_CHAR_MAP);
+		$i = \array_search($chr, $this::ALPHANUM_CHAR_MAP);
 
 		if($i !== false){
 			return $i;
 		}
 
-		throw new QRCodeDataException('illegal char: "'.$chr.'" ['.ord($chr).']');
+		throw new QRCodeDataException('illegal char: "'.$chr.'" ['.\ord($chr).']');
 	}
 
 }

src/Data/Byte.php

@@ -36,7 +36,7 @@ class Byte extends QRDataAbstract{
 		$i = 0;
 
 		while($i < $this->strlen){
-			$this->bitBuffer->put(ord($data[$i]), 8);
+			$this->bitBuffer->put(\ord($data[$i]), 8);
 			$i++;
 		}
 

src/Data/Kanji.php

@@ -33,7 +33,7 @@ class Kanji extends QRDataAbstract{
 	 * @inheritdoc
 	 */
 	protected function getLength(string $data):int{
-		return mb_strlen($data, 'SJIS');
+		return \mb_strlen($data, 'SJIS');
 	}
 
 	/**
@@ -43,10 +43,10 @@ class Kanji extends QRDataAbstract{
 	 * @throws \chillerlan\QRCode\Data\QRCodeDataException
 	 */
 	protected function write(string $data):void{
-		$len = strlen($data);
+		$len = \strlen($data);
 
 		for($i = 0; $i + 1 < $len; $i += 2){
-			$c = ((0xff & ord($data[$i])) << 8) | (0xff & ord($data[$i + 1]));
+			$c = ((0xff & \ord($data[$i])) << 8) | (0xff & \ord($data[$i + 1]));
 
 			if(0x8140 <= $c && $c <= 0x9FFC){
 				$c -= 0x8140;

src/Data/MaskPatternTester.php

@@ -56,7 +56,7 @@ class MaskPatternTester{
 		$penalty  = 0;
 
 		for($level = 1; $level <= 4; $level++){
-			$penalty += call_user_func([$this, 'testLevel'.$level]);
+			$penalty += \call_user_func([$this, 'testLevel'.$level]);
 		}
 
 		return (int)$penalty;
@@ -212,7 +212,7 @@ class MaskPatternTester{
 			}
 		}
 
-		return (abs(100 * $count / $this->moduleCount / $this->moduleCount - 50) / 5) * 10;
+		return (\abs(100 * $count / $this->moduleCount / $this->moduleCount - 50) / 5) * 10;
 	}
 
 }

src/Data/Number.php

@@ -36,18 +36,18 @@ class Number extends QRDataAbstract{
 		$i = 0;
 
 		while($i + 2 < $this->strlen){
-			$this->bitBuffer->put($this->parseInt(substr($data, $i, 3)), 10);
+			$this->bitBuffer->put($this->parseInt(\substr($data, $i, 3)), 10);
 			$i += 3;
 		}
 
 		if($i < $this->strlen){
 
 			if($this->strlen - $i === 1){
-				$this->bitBuffer->put($this->parseInt(substr($data, $i, $i + 1)), 4);
+				$this->bitBuffer->put($this->parseInt(\substr($data, $i, $i + 1)), 4);
 			}
 			// @codeCoverageIgnoreStart
 			elseif($this->strlen - $i === 2){
-				$this->bitBuffer->put($this->parseInt(substr($data, $i, $i + 2)), 7);
+				$this->bitBuffer->put($this->parseInt(\substr($data, $i, $i + 2)), 7);
 			}
 			// @codeCoverageIgnoreEnd
 
@@ -66,13 +66,13 @@ class Number extends QRDataAbstract{
 
 		$len = strlen($string);
 		for($i = 0; $i < $len; $i++){
-			$c = ord($string[$i]);
+			$c = \ord($string[$i]);
 
 			if(!in_array($string[$i], $this::NUMBER_CHAR_MAP, true)){
 				throw new QRCodeDataException('illegal char: "'.$string[$i].'" ['.$c.']');
 			}
 
-			$c = $c - ord('0');
+			$c = $c - \ord('0');
 
 			$num = $num * 10 + $c;
 		}

src/Data/QRDataAbstract.php

@@ -104,7 +104,7 @@ abstract class QRDataAbstract implements QRDataInterface{
 	public function setData(string $data):QRDataInterface{
 
 		if($this->datamode === QRCode::DATA_KANJI){
-			$data = mb_convert_encoding($data, 'SJIS', mb_detect_encoding($data));
+			$data = \mb_convert_encoding($data, 'SJIS', \mb_detect_encoding($data));
 		}
 
 		$this->strlen  = $this->getLength($data);
@@ -169,7 +169,7 @@ abstract class QRDataAbstract implements QRDataInterface{
 	 * @return int
 	 */
 	protected function getLength(string $data):int{
-		return strlen($data);
+		return \strlen($data);
 	}
 
 	/**
@@ -182,7 +182,7 @@ abstract class QRDataAbstract implements QRDataInterface{
 		$maxlength = 0;
 
 		// guess the version number within the given range
-		foreach(range($this->options->versionMin, $this->options->versionMax) as $version){
+		foreach(\range($this->options->versionMin, $this->options->versionMax) as $version){
 			$maxlength = $this::MAX_LENGTH[$version][QRCode::DATA_MODES[$this->datamode]][QRCode::ECC_MODES[$this->options->eccLevel]];
 
 			if($this->strlen <= $maxlength){
@@ -270,13 +270,13 @@ abstract class QRDataAbstract implements QRDataInterface{
 	protected function maskECC():array{
 		[$l1, $l2, $b1, $b2] = $this::RSBLOCKS[$this->version][QRCode::ECC_MODES[$this->options->eccLevel]];
 
-		$rsBlocks     = array_fill(0, $l1, [$b1, $b2]);
+		$rsBlocks     = \array_fill(0, $l1, [$b1, $b2]);
 		$rsCount      = $l1 + $l2;
-		$this->ecdata = array_fill(0, $rsCount, null);
+		$this->ecdata = \array_fill(0, $rsCount, null);
 		$this->dcdata = $this->ecdata;
 
 		if($l2 > 0){
-			$rsBlocks = array_merge($rsBlocks, array_fill(0, $l2, [$b1 + 1, $b2 + 1]));
+			$rsBlocks = \array_merge($rsBlocks, \array_fill(0, $l2, [$b1 + 1, $b2 + 1]));
 		}
 
 		$totalCodeCount = 0;
@@ -288,9 +288,9 @@ abstract class QRDataAbstract implements QRDataInterface{
 			[$rsBlockTotal, $dcCount] = $block;
 
 			$ecCount            = $rsBlockTotal - $dcCount;
-			$maxDcCount         = max($maxDcCount, $dcCount);
-			$maxEcCount         = max($maxEcCount, $ecCount);
-			$this->dcdata[$key] = array_fill(0, $dcCount, null);
+			$maxDcCount         = \max($maxDcCount, $dcCount);
+			$maxEcCount         = \max($maxEcCount, $ecCount);
+			$this->dcdata[$key] = \array_fill(0, $dcCount, null);
 
 			foreach($this->dcdata[$key] as $a => $_z){
 				$this->dcdata[$key][$a] = 0xff & $this->bitBuffer->buffer[$a + $offset];
@@ -307,13 +307,13 @@ abstract class QRDataAbstract implements QRDataInterface{
 			$totalCodeCount += $rsBlockTotal;
 		}
 
-		$data  = array_fill(0, $totalCodeCount, null);
+		$data  = \array_fill(0, $totalCodeCount, null);
 		$index = 0;
 
 		$mask = function($arr, $count) use (&$data, &$index, $rsCount){
 			for($x = 0; $x < $count; $x++){
 				for($y = 0; $y < $rsCount; $y++){
-					if($x < count($arr[$y])){
+					if($x < \count($arr[$y])){
 						$data[$index] = $arr[$y][$x];
 						$index++;
 					}
@@ -342,19 +342,19 @@ abstract class QRDataAbstract implements QRDataInterface{
 			$rsPoly->multiply($modPoly->getNum());
 		}
 
-		$rsPolyCount = count($rsPoly->getNum());
+		$rsPolyCount = \count($rsPoly->getNum());
 
 		$modPoly
 			->setNum($this->dcdata[$key], $rsPolyCount - 1)
 			->mod($rsPoly->getNum())
 		;
 
-		$this->ecdata[$key] = array_fill(0, $rsPolyCount - 1, null);
+		$this->ecdata[$key] = \array_fill(0, $rsPolyCount - 1, null);
 		$num                = $modPoly->getNum();
 
 		return [
 			$num,
-			count($num) - count($this->ecdata[$key]),
+			\count($num) - \count($this->ecdata[$key]),
 		];
 	}
 

src/Data/QRMatrix.php

@@ -135,18 +135,18 @@ class QRMatrix{
 	 */
 	public function __construct(int $version, int $eclevel){
 
-		if(!in_array($version, range(1, 40), true)){
+		if(!\in_array($version, \range(1, 40), true)){
 			throw new QRCodeDataException('invalid QR Code version');
 		}
 
-		if(!array_key_exists($eclevel, QRCode::ECC_MODES)){
+		if(!\array_key_exists($eclevel, QRCode::ECC_MODES)){
 			throw new QRCodeDataException('invalid ecc level');
 		}
 
 		$this->version     = $version;
 		$this->eclevel     = $eclevel;
 		$this->moduleCount = $this->version * 4 + 17;
-		$this->matrix      = array_fill(0, $this->moduleCount, array_fill(0, $this->moduleCount, $this::M_NULL));
+		$this->matrix      = \array_fill(0, $this->moduleCount, \array_fill(0, $this->moduleCount, $this::M_NULL));
 	}
 
 	/**
@@ -346,7 +346,7 @@ class QRMatrix{
 	 */
 	public function setTimingPattern():QRMatrix{
 
-		foreach(range(8, $this->moduleCount - 8 - 1) as $i){
+		foreach(\range(8, $this->moduleCount - 8 - 1) as $i){
 
 			if($this->matrix[6][$i] !== $this::M_NULL || $this->matrix[$i][6] !== $this::M_NULL){
 				continue;
@@ -375,7 +375,7 @@ class QRMatrix{
 		if($bits !== false){
 
 			for($i = 0; $i < 18; $i++){
-				$a = (int)floor($i / 3);
+				$a = (int)\floor($i / 3);
 				$b = $i % 3 + $this->moduleCount - 8 - 3;
 				$v = !$test && (($bits >> $i) & 1) === 1;
 
@@ -445,22 +445,22 @@ class QRMatrix{
 			throw new QRCodeDataException('use only after writing data');
 		}
 
-		$size = $size !== null ? max(0, min($size, floor($this->moduleCount / 2))) : 4;
+		$size = $size !== null ? \max(0, \min($size, \floor($this->moduleCount / 2))) : 4;
 		$t    = $this::M_QUIETZONE;
 
 		for($y = 0; $y < $this->moduleCount; $y++){
 			for($i = 0; $i < $size; $i++){
-				array_unshift($this->matrix[$y], $t);
-				array_push($this->matrix[$y], $t);
+				\array_unshift($this->matrix[$y], $t);
+				\array_push($this->matrix[$y], $t);
 			}
 		}
 
 		$this->moduleCount += ($size * 2);
-		$r                 = array_fill(0, $this->moduleCount, $t);
+		$r                 = \array_fill(0, $this->moduleCount, $t);
 
 		for($i = 0; $i < $size; $i++){
-			array_unshift($this->matrix, $r);
-			array_push($this->matrix, $r);
+			\array_unshift($this->matrix, $r);
+			\array_push($this->matrix, $r);
 		}
 
 		return $this;
@@ -478,7 +478,7 @@ class QRMatrix{
 	 */
 	public function mapData(array $data, int $maskPattern):QRMatrix{
 		$this->maskPattern = $maskPattern;
-		$byteCount         = count($data);
+		$byteCount         = \count($data);
 		$size              = $this->moduleCount - 1;
 
 		for($i = $size, $y = $size, $inc = -1, $byteIndex = 0, $bitIndex  = 7; $i > 0; $i -= 2){
@@ -551,7 +551,7 @@ class QRMatrix{
 				$y % 2,
 				$x % 3,
 				$a % 3,
-				(floor($y / 2) + floor($x / 3)) % 2,
+				(\floor($y / 2) + \floor($x / 3)) % 2,
 				$m % 2 + $m % 3,
 				($m % 2 + $m % 3) % 2,
 				($m % 3 + $a % 2) % 2

src/Helpers/BitBuffer.php

@@ -55,9 +55,9 @@ class BitBuffer{
 	 * @return \chillerlan\QRCode\Helpers\BitBuffer
 	 */
 	public function putBit(bool $bit):BitBuffer{
-		$bufIndex = floor($this->length / 8);
+		$bufIndex = \floor($this->length / 8);
 
-		if(count($this->buffer) <= $bufIndex){
+		if(\count($this->buffer) <= $bufIndex){
 			$this->buffer[] = 0;
 		}
 

src/Helpers/Polynomial.php

@@ -87,13 +87,13 @@ class Polynomial{
 	 */
 	public function setNum(array $num, int $shift = null):Polynomial{
 		$offset = 0;
-		$numCount = count($num);
+		$numCount = \count($num);
 
 		while($offset < $numCount && $num[$offset] === 0){
 			$offset++;
 		}
 
-		$this->num = array_fill(0, $numCount - $offset + ($shift ?? 0), 0);
+		$this->num = \array_fill(0, $numCount - $offset + ($shift ?? 0), 0);
 
 		for($i = 0; $i < $numCount - $offset; $i++){
 			$this->num[$i] = $num[$i + $offset];
@@ -108,7 +108,7 @@ class Polynomial{
 	 * @return \chillerlan\QRCode\Helpers\Polynomial
 	 */
 	public function multiply(array $e):Polynomial{
-		$n = array_fill(0, count($this->num) + count($e) - 1, 0);
+		$n = \array_fill(0, \count($this->num) + \count($e) - 1, 0);
 
 		foreach($this->num as $i => $vi){
 			$vi = $this->glog($vi);
@@ -132,7 +132,7 @@ class Polynomial{
 	public function mod(array $e):Polynomial{
 		$n = $this->num;
 
-		if(count($n) - count($e) < 0){
+		if(\count($n) - \count($e) < 0){
 			return $this;
 		}
 

src/Output/QRImage.php

@@ -51,13 +51,13 @@ class QRImage extends QROutputAbstract{
 		foreach($this::DEFAULT_MODULE_VALUES as $M_TYPE => $defaultValue){
 			$v = $this->options->moduleValues[$M_TYPE] ?? null;
 
-			if(!is_array($v) || count($v) < 3){
+			if(!\is_array($v) || \count($v) < 3){
 				$this->moduleValues[$M_TYPE] = $defaultValue
 					? [0, 0, 0]
 					: [255, 255, 255];
 			}
 			else{
-				$this->moduleValues[$M_TYPE] = array_values($v);
+				$this->moduleValues[$M_TYPE] = \array_values($v);
 			}
 
 		}
@@ -70,14 +70,14 @@ class QRImage extends QROutputAbstract{
 	 * @return string
 	 */
 	public function dump(string $file = null):string{
-		$this->image      = imagecreatetruecolor($this->length, $this->length);
-		$this->background = imagecolorallocate($this->image, ...$this->options->imageTransparencyBG);
+		$this->image      = \imagecreatetruecolor($this->length, $this->length);
+		$this->background = \imagecolorallocate($this->image, ...$this->options->imageTransparencyBG);
 
-		if((bool)$this->options->imageTransparent && in_array($this->options->outputType, $this::TRANSPARENCY_TYPES, true)){
-			imagecolortransparent($this->image, $this->background);
+		if((bool)$this->options->imageTransparent && \in_array($this->options->outputType, $this::TRANSPARENCY_TYPES, true)){
+			\imagecolortransparent($this->image, $this->background);
 		}
 
-		imagefilledrectangle($this->image, 0, 0, $this->length, $this->length, $this->background);
+		\imagefilledrectangle($this->image, 0, 0, $this->length, $this->length, $this->background);
 
 		foreach($this->matrix->matrix() as $y => $row){
 			foreach($row as $x => $M_TYPE){
@@ -88,7 +88,7 @@ class QRImage extends QROutputAbstract{
 		$imageData = $this->dumpImage($file);
 
 		if((bool)$this->options->imageBase64){
-			$imageData = 'data:image/'.$this->options->outputType.';base64,'.base64_encode($imageData);
+			$imageData = 'data:image/'.$this->options->outputType.';base64,'.\base64_encode($imageData);
 		}
 
 		return $imageData;
@@ -102,13 +102,13 @@ class QRImage extends QROutputAbstract{
 	 * @return void
 	 */
 	protected function setPixel(int $x, int $y, array $rgb):void{
-		imagefilledrectangle(
+		\imagefilledrectangle(
 			$this->image,
 			$x * $this->scale,
 			$y * $this->scale,
 			($x + 1) * $this->scale,
 			($y + 1) * $this->scale,
-			imagecolorallocate($this->image, ...$rgb)
+			\imagecolorallocate($this->image, ...$rgb)
 		);
 	}
 
@@ -122,10 +122,10 @@ class QRImage extends QROutputAbstract{
 	protected function dumpImage(string $file = null):string{
 		$file = $file ?? $this->options->cachefile;
 
-		ob_start();
+		\ob_start();
 
 		try{
-			call_user_func([$this, $this->outputMode ?? $this->defaultMode]);
+			\call_user_func([$this, $this->outputMode ?? $this->defaultMode]);
 		}
 		// not going to cover edge cases
 		// @codeCoverageIgnoreStart
@@ -134,10 +134,10 @@ class QRImage extends QROutputAbstract{
 		}
 		// @codeCoverageIgnoreEnd
 
-		$imageData = ob_get_contents();
-		imagedestroy($this->image);
+		$imageData = \ob_get_contents();
+		\imagedestroy($this->image);
 
-		ob_end_clean();
+		\ob_end_clean();
 
 		if($file !== null){
 			$this->saveToFile($imageData, $file);
@@ -150,10 +150,10 @@ class QRImage extends QROutputAbstract{
 	 * @return void
 	 */
 	protected function png():void{
-		imagepng(
+		\imagepng(
 			$this->image,
 			null,
-			in_array($this->options->pngCompression, range(-1, 9), true)
+			\in_array($this->options->pngCompression, \range(-1, 9), true)
 				? $this->options->pngCompression
 				: -1
 		);
@@ -164,17 +164,17 @@ class QRImage extends QROutputAbstract{
 	 * @return void
 	 */
 	protected function gif():void{
-		imagegif($this->image);
+		\imagegif($this->image);
 	}
 
 	/**
 	 * @return void
 	 */
 	protected function jpg():void{
-		imagejpeg(
+		\imagejpeg(
 			$this->image,
 			null,
-			in_array($this->options->jpegQuality, range(0, 100), true)
+			\in_array($this->options->jpegQuality, \range(0, 100), true)
 				? $this->options->jpegQuality
 				: 85
 		);

src/Output/QRMarkup.php

@@ -39,13 +39,13 @@ class QRMarkup extends QROutputAbstract{
 		foreach($this::DEFAULT_MODULE_VALUES as $M_TYPE => $defaultValue){
 			$v = $this->options->moduleValues[$M_TYPE] ?? null;
 
-			if(!is_string($v)){
+			if(!\is_string($v)){
 				$this->moduleValues[$M_TYPE] = $defaultValue
 					? $this->options->markupDark
 					: $this->options->markupLight;
 			}
 			else{
-				$this->moduleValues[$M_TYPE] = trim(strip_tags($v), '\'"');
+				$this->moduleValues[$M_TYPE] = \trim(\strip_tags($v), '\'"');
 			}
 
 		}
@@ -85,7 +85,7 @@ class QRMarkup extends QROutputAbstract{
 	protected function svg():string{
 		$matrix = $this->matrix->matrix();
 
-		$svg = sprintf($this->svgHeader, $this->options->cssClass, $this->options->svgViewBoxSize ?? $this->moduleCount)
+		$svg = \sprintf($this->svgHeader, $this->options->cssClass, $this->options->svgViewBoxSize ?? $this->moduleCount)
 		       .$this->options->eol
 		       .'<defs>'.$this->options->svgDefs.'</defs>'
 		       .$this->options->eol;

src/Output/QROutputAbstract.php

@@ -73,9 +73,9 @@ abstract class QROutputAbstract implements QROutputInterface{
 		$this->scale       = $this->options->scale;
 		$this->length      = $this->moduleCount * $this->scale;
 
-		$class = get_called_class();
+		$class = \get_called_class();
 
-		if(array_key_exists($class, QRCode::OUTPUT_MODES) && in_array($this->options->outputType, QRCode::OUTPUT_MODES[$class])){
+		if(\array_key_exists($class, QRCode::OUTPUT_MODES) && \in_array($this->options->outputType, QRCode::OUTPUT_MODES[$class])){
 			$this->outputMode = $this->options->outputType;
 		}
 
@@ -100,11 +100,11 @@ abstract class QROutputAbstract implements QROutputInterface{
 	 */
 	protected function saveToFile(string $data, string $file):bool{
 
-		if(!is_writable(dirname($file))){
+		if(!\is_writable(\dirname($file))){
 			throw new QRCodeOutputException('Could not write data to cache file: '.$file);
 		}
 
-		return (bool)file_put_contents($file, $data);
+		return (bool)\file_put_contents($file, $data);
 	}
 
 	/**
@@ -113,7 +113,7 @@ abstract class QROutputAbstract implements QROutputInterface{
 	 * @return string|mixed
 	 */
 	public function dump(string $file = null){
-		$data = call_user_func([$this, $this->outputMode ?? $this->defaultMode]);
+		$data = \call_user_func([$this, $this->outputMode ?? $this->defaultMode]);
 		$file = $file ?? $this->options->cachefile;
 
 		if($file !== null){

src/Output/QRString.php

@@ -58,17 +58,17 @@ class QRString extends QROutputAbstract{
 				$r[] = $this->moduleValues[$M_TYPE];
 			}
 
-			$str[] = implode('', $r);
+			$str[] = \implode('', $r);
 		}
 
-		return implode($this->options->eol, $str);
+		return \implode($this->options->eol, $str);
 	}
 
 	/**
 	 * @return string
 	 */
 	protected function json():string{
-		return json_encode($this->matrix->matrix());
+		return \json_encode($this->matrix->matrix());
 	}
 
 }

src/QRCode.php

@@ -111,9 +111,9 @@ class QRCode{
 	 */
 	public function __construct(SettingsContainerInterface $options = null){
 		// save the current mb encoding (in case it differs from UTF-8)
-		$this->mbCurrentEncoding = mb_internal_encoding();
+		$this->mbCurrentEncoding = \mb_internal_encoding();
 		// use UTF-8 from here on
-		mb_internal_encoding('UTF-8');
+		\mb_internal_encoding('UTF-8');
 
 		$this->options = $options ?? new QROptions;
 	}
@@ -123,7 +123,7 @@ class QRCode{
 	 */
 	public function __destruct(){
 		// restore the previous mb_internal_encoding, so that we don't mess up the rest of the script
-		mb_internal_encoding($this->mbCurrentEncoding);
+		\mb_internal_encoding($this->mbCurrentEncoding);
 	}
 
 	/**
@@ -183,7 +183,7 @@ class QRCode{
 			$penalties[$pattern] = $tester->testPattern();
 		}
 
-		return array_search(min($penalties), $penalties, true);
+		return \array_search(\min($penalties), $penalties, true);
 	}
 
 	/**
@@ -199,7 +199,7 @@ class QRCode{
 		foreach(['Number', 'AlphaNum', 'Kanji', 'Byte'] as $mode){
 			$dataInterface = __NAMESPACE__.'\\Data\\'.$mode;
 
-			if(call_user_func_array([$this, 'is'.$mode], [$data]) && class_exists($dataInterface)){
+			if(\call_user_func_array([$this, 'is'.$mode], [$data]) && \class_exists($dataInterface)){
 				return new $dataInterface($this->options, $data);
 			}
 
@@ -218,13 +218,13 @@ class QRCode{
 	 */
 	protected function initOutputInterface(string $data):QROutputInterface{
 
-		if($this->options->outputType === $this::OUTPUT_CUSTOM && class_exists($this->options->outputInterface)){
+		if($this->options->outputType === $this::OUTPUT_CUSTOM && \class_exists($this->options->outputInterface)){
 			return new $this->options->outputInterface($this->options, $this->getMatrix($data));
 		}
 
 		foreach($this::OUTPUT_MODES as $outputInterface => $modes){
 
-			if(in_array($this->options->outputType, $modes, true) && class_exists($outputInterface)){
+			if(in_array($this->options->outputType, $modes, true) && \class_exists($outputInterface)){
 				return new $outputInterface($this->options, $this->getMatrix($data));
 			}
 
@@ -264,10 +264,10 @@ class QRCode{
 	 * @return bool
 	 */
 	protected function checkString(string $string, array $charmap):bool{
-		$len = strlen($string);
+		$len = \strlen($string);
 
 		for($i = 0; $i < $len; $i++){
-			if(!in_array($string[$i], $charmap, true)){
+			if(!\in_array($string[$i], $charmap, true)){
 				return false;
 			}
 		}
@@ -284,10 +284,10 @@ class QRCode{
 	 */
 	public function isKanji(string $string):bool{
 		$i   = 0;
-		$len = strlen($string);
+		$len = \strlen($string);
 
 		while($i + 1 < $len){
-			$c = ((0xff&ord($string[$i])) << 8)|(0xff&ord($string[$i + 1]));
+			$c = ((0xff&\ord($string[$i])) << 8)|(0xff&\ord($string[$i + 1]));
 
 			if(!($c >= 0x8140 && $c <= 0x9FFC) && !($c >= 0xE040 && $c <= 0xEBBF)){
 				return false;

src/QROptionsTrait.php

@@ -249,7 +249,7 @@ trait QROptionsTrait{
 	 */
 	public function __set(string $property, $value):void{
 
-		if(in_array($property, ['eccLevel', 'maskPattern', 'imageTransparencyBG', 'version'], true)){
+		if(\in_array($property, ['eccLevel', 'maskPattern', 'imageTransparencyBG', 'version'], true)){
 			$this->{'set_'.$property}($value);
 
 			return;
@@ -277,11 +277,11 @@ trait QROptionsTrait{
 	 * @return void
 	 */
 	protected function setMinMaxVersion(int $versionMin, int $versionMax):void{
-		$min = max(1, min(40, $versionMin));
-		$max = max(1, min(40, $versionMax));
+		$min = \max(1, \min(40, $versionMin));
+		$max = \max(1, \min(40, $versionMax));
 
-		$this->versionMin = min($min, $max);
-		$this->versionMax = max($min, $max);
+		$this->versionMin = \min($min, $max);
+		$this->versionMax = \max($min, $max);
 	}
 
 	/**
@@ -307,7 +307,7 @@ trait QROptionsTrait{
 	protected function set_maskPattern(int $maskPattern):void{
 
 		if($maskPattern !== QRCode::MASK_PATTERN_AUTO){
-			$this->maskPattern = max(0, min(7, $maskPattern));
+			$this->maskPattern = \max(0, \min(7, $maskPattern));
 		}
 
 	}
@@ -321,7 +321,7 @@ trait QROptionsTrait{
 	protected function set_imageTransparencyBG($imageTransparencyBG):void{
 
 		// invalid value - set to white as default
-		if(!is_array($imageTransparencyBG) || count($imageTransparencyBG) < 3){
+		if(!\is_array($imageTransparencyBG) || \count($imageTransparencyBG) < 3){
 			$this->imageTransparencyBG = [255, 255, 255];
 
 			return;
@@ -329,16 +329,16 @@ trait QROptionsTrait{
 
 		foreach($imageTransparencyBG as $k => $v){
 
-			if(!is_numeric($v)){
+			if(!\is_numeric($v)){
 				throw new QRCodeException('Invalid RGB value.');
 			}
 
 			// clamp the values
-			$this->imageTransparencyBG[$k] = max(0, min(255, (int)$v));
+			$this->imageTransparencyBG[$k] = \max(0, \min(255, (int)$v));
 		}
 
 		// use the array values to not run into errors with the spread operator (...$arr)
-		$this->imageTransparencyBG = array_values($this->imageTransparencyBG);
+		$this->imageTransparencyBG = \array_values($this->imageTransparencyBG);
 	}
 
 	/**
@@ -349,7 +349,7 @@ trait QROptionsTrait{
 	protected function set_version(int $version):void{
 
 		if($version !== QRCode::VERSION_AUTO){
-			$this->version = max(1, min(40, $version));
+			$this->version = \max(1, \min(40, $version));
 		}
 
 	}