diff --git a/.php-cs-fixer.php b/.php-cs-fixer.php
new file mode 100644
index 0000000..1344ecb
--- /dev/null
+++ b/.php-cs-fixer.php
@@ -0,0 +1,11 @@
+<?php
+
+$finder = PhpCsFixer\Finder::create()
+    ->exclude('vendor')
+    ->in(__DIR__);
+
+$config = new PhpCsFixer\Config();
+return $config->setRules([
+        '@PSR12' => true,
+    ])
+    ->setFinder($finder);
diff --git a/composer.json b/composer.json
index 23723af..3dba5a8 100644
--- a/composer.json
+++ b/composer.json
@@ -13,7 +13,9 @@
     },
     "require-dev": {
         "phpunit/phpunit": "^10.0",
-        "orchestra/testbench": "^8.6"
+        "phpstan/phpstan": "^1.10",
+        "friendsofphp/php-cs-fixer": "^3.26",
+        "squizlabs/php_codesniffer": "^3.7"
     },
     "autoload": {
         "psr-4": {"AnourValar\\Office\\": "src/"}
diff --git a/phpcs.xml b/phpcs.xml
new file mode 100644
index 0000000..10fcd8d
--- /dev/null
+++ b/phpcs.xml
@@ -0,0 +1,36 @@
+<?xml version="1.0"?>
+<!-- @see https://pear.php.net/manual/en/package.php.php-codesniffer.annotated-ruleset.php -->
+<ruleset name="PHPCS Rules">
+
+    <description>PHPCS ruleset</description>
+
+    <file>src</file>
+    <file>tests</file>
+
+    <!-- Show progress of the run -->
+    <arg value= "p"/>
+
+    <!-- Show sniff codes in all reports -->
+    <arg value= "s"/>
+
+    <!-- Our base rule: set to PSR12 -->
+    <rule ref="PSR12">
+        <exclude name="PSR12.Operators.OperatorSpacing.NoSpaceBefore"/>
+        <exclude name="PSR12.Operators.OperatorSpacing.NoSpaceAfter"/>
+        <exclude name="PSR12.Traits.UseDeclaration.MultipleImport"/>
+        <exclude name="Generic.Files.LineLength.TooLong"/>
+        <exclude name="PSR2.Methods.FunctionClosingBrace.SpacingBeforeClose"/>
+        <exclude name="PSR12.Classes.OpeningBraceSpace.Found"/>
+        <exclude name="Squiz.WhiteSpace.ControlStructureSpacing.SpacingAfterOpen"/>
+        <exclude name="Squiz.WhiteSpace.ControlStructureSpacing.SpacingBeforeClose"/>
+    </rule>
+
+    <rule ref="PSR1.Methods.CamelCapsMethodName.NotCamelCaps">
+        <exclude-pattern>tests/</exclude-pattern>
+    </rule>
+
+    <rule ref="Internal.NoCodeFound">
+        <exclude-pattern>tests/</exclude-pattern>
+    </rule>
+
+</ruleset>
diff --git a/phpstan.neon b/phpstan.neon
new file mode 100644
index 0000000..9c20df8
--- /dev/null
+++ b/phpstan.neon
@@ -0,0 +1,50 @@
+parameters:
+
+    paths:
+        - src
+        - tests
+
+    # The level 9 is the highest level
+    level: 5
+
+    ignoreErrors:
+        - '#has an uninitialized readonly property#'
+        - '#Binary operation \"\+\" between string#'
+        - '#Call to an undefined method AnourValar\\Office\\Drivers\\SaveInterface\:\:getSheetCount\(\)#'
+        - '#Call to an undefined method AnourValar\\Office\\Drivers\\SaveInterface\:\:replace\(\)#'
+        - '#unknown class PhpOffice#'
+        - '#Unsafe usage of new static#'
+        - '#Call to an undefined method AnourValar\\Office\\Drivers\\SaveInterface\:\:setGrid\(\)#'
+        - '#Parameter \#1 \$driver of method AnourValar\\Office\\GridService\:\:getGenerator\(\) expects AnourValar\\Office\\Drivers\\GridInterface#'
+        - '#Class AnourValar\\Office\\Tests\\SheetsParserTest has an uninitialized property \$service#'
+        - '#has an uninitialized property \$fileSystem#'
+        - '#\(\) on iterable\.#'
+        - '#Instantiated class ZipStream#'
+        - '#unknown class ZipStream#'
+        - '#has an uninitialized property \$sourceActiveSheetIndex#'
+        - '#\$format is assigned outside of the constructor#'
+        - '#has invalid return type PhpOffice#'
+        - '#\$spreadsheet is assigned outside of the constructor#'
+        - '#Binary operation \"\-\" between string and string results in an error#'
+        - '#Instantiated class PhpOffice#'
+        - '#expects string, int given#'
+        - '#expects int, string given#'
+        - '#has invalid type PhpOffice#'
+        - '#Match expression does not handle remaining value: mixed#'
+        - '#Access to an undefined property AnourValar\\Office\\Drivers\\MixInterface\:\:\$spreadsheet#'
+        - '#Call to an undefined method AnourValar\\Office\\Drivers\\MixInterface\:\:sheet\(\)#'
+
+
+    excludePaths:
+
+
+    checkFunctionNameCase: true
+    checkInternalClassCaseSensitivity: true
+    checkAlwaysTrueInstanceof: true
+    reportMaybesInMethodSignatures: true
+    reportStaticMethodSignatures: true
+    checkUninitializedProperties: true
+    checkDynamicProperties: true
+    reportAlwaysTrueInLastCondition: true
+    reportWrongPhpDocTypeInVarTag: true
+    checkMissingCallableSignature: true
diff --git a/src/Drivers/PhpSpreadsheetDriver.php b/src/Drivers/PhpSpreadsheetDriver.php
index 8887d63..f368a73 100644
--- a/src/Drivers/PhpSpreadsheetDriver.php
+++ b/src/Drivers/PhpSpreadsheetDriver.php
@@ -49,7 +49,7 @@ public function sheet(): \PhpOffice\PhpSpreadsheet\Worksheet\Worksheet
      */
     public function create(): self
     {
-        $instance = new static;
+        $instance = new static();
         $instance->spreadsheet = new \PhpOffice\PhpSpreadsheet\Spreadsheet();
         $instance->sourceActiveSheetIndex = 0;
 
@@ -63,7 +63,7 @@ public function create(): self
      */
     public function load(string $file, \AnourValar\Office\Format $format): self
     {
-        $instance = new static;
+        $instance = new static();
         $instance->spreadsheet = IOFactory::createReader($instance->getFormat($format))->load($file);
         $instance->sourceActiveSheetIndex = $instance->spreadsheet->getActiveSheetIndex();
 
@@ -240,7 +240,7 @@ public function getValues(?string $ceilRange): array
      */
     public function getMergeCells(): array
     {
-        return array_values( $this->sheet()->getMergeCells() );
+        return array_values($this->sheet()->getMergeCells());
     }
 
     /**
@@ -531,7 +531,7 @@ public function duplicateRows(string $ceilRange, callable $value, int $indentRow
                 && $this->isColumnGE($item[0][0], $range[0][0]) && $this->isColumnLE($item[0][0], $range[1][0]) // columns
                 && $this->isColumnGE($item[1][0], $range[0][0]) && $this->isColumnLE($item[1][0], $range[1][0])
             ) {
-                $this->mergeCells($item[0][0].($item[0][1]+$shift) . ':' . $item[1][0].($item[1][1]+$shift));
+                $this->mergeCells($item[0][0].($item[0][1] + $shift) . ':' . $item[1][0].($item[1][1] + $shift));
             }
         }
 
@@ -617,7 +617,7 @@ public function setStyle(string $range, array $style): self
         }
 
         if (isset($style['align'])) {
-            $align = match($style['align']) {
+            $align = match ($style['align']) {
                 \PhpOffice\PhpSpreadsheet\Style\Alignment::HORIZONTAL_LEFT => 'left',
                 \PhpOffice\PhpSpreadsheet\Style\Alignment::HORIZONTAL_CENTER => 'center',
                 \PhpOffice\PhpSpreadsheet\Style\Alignment::HORIZONTAL_RIGHT => 'right',
@@ -630,7 +630,7 @@ public function setStyle(string $range, array $style): self
         }
 
         if (isset($style['valign'])) {
-            $valign = match($style['valign']) {
+            $valign = match ($style['valign']) {
                 \PhpOffice\PhpSpreadsheet\Style\Alignment::VERTICAL_TOP => 'top',
                 \PhpOffice\PhpSpreadsheet\Style\Alignment::VERTICAL_CENTER => 'center',
                 \PhpOffice\PhpSpreadsheet\Style\Alignment::VERTICAL_BOTTOM => 'bottom',
@@ -741,11 +741,12 @@ protected function writeConfiguration(\PhpOffice\PhpSpreadsheet\Writer\IWriter $
      */
     protected function getFormat(\AnourValar\Office\Format $format): string
     {
-        return match($format) {
+        return match ($format) {
             \AnourValar\Office\Format::Xlsx => 'Xlsx',
             \AnourValar\Office\Format::Pdf => 'Mpdf',
             \AnourValar\Office\Format::Html => 'Html',
             \AnourValar\Office\Format::Ods => 'Ods',
+            default => throw new \RuntimeException('Format is not supported.'),
         };
     }
 }
diff --git a/src/Drivers/ZipDriver.php b/src/Drivers/ZipDriver.php
index 302841e..908d8b9 100644
--- a/src/Drivers/ZipDriver.php
+++ b/src/Drivers/ZipDriver.php
@@ -4,7 +4,7 @@
 
 class ZipDriver implements DocumentInterface, GridInterface
 {
-    use \Anourvalar\Office\Traits\Parser;
+    use \AnourValar\Office\Traits\Parser;
     use \AnourValar\Office\Traits\XFormat;
 
     /**
@@ -41,10 +41,10 @@ public function load(string $file, \AnourValar\Office\Format $format): self
             throw new \LogicException('Driver only supports Docx, Xlsx formats.');
         }
 
-        $instance = new static;
+        $instance = new static();
         $fileSystem = [];
 
-        $zipArchive = new \ZipArchive;
+        $zipArchive = new \ZipArchive();
         $zipArchive->open($file);
         try {
             $count = $zipArchive->numFiles;
@@ -82,7 +82,7 @@ public function save(string $file, \AnourValar\Office\Format $format): void
         try {
             foreach ($this->fileSystem as $filename => $content) {
                 $zipStream->addFile($filename, $content);
-             }
+            }
         } catch (\Throwable $e) {
             $zipStream->finish();
             ob_get_clean();
@@ -148,7 +148,7 @@ public function setGrid(iterable $data): self
             $column = 'A';
             foreach ($titles as $value) {
                 $value = (string) $value;
-                if ($value === null || $value === '') {
+                if ($value === '') {
                     $firstColumn++;
                     $column++;
                     continue;
diff --git a/src/Format.php b/src/Format.php
index f6dc377..db1c478 100644
--- a/src/Format.php
+++ b/src/Format.php
@@ -15,7 +15,7 @@ enum Format: string
      */
     public function fileExtension(): string
     {
-        return match($this) {
+        return match ($this) {
             Format::Xlsx => 'xlsx',
             Format::Pdf => 'pdf',
             Format::Html => 'html',
@@ -31,7 +31,7 @@ public function fileExtension(): string
      */
     public function contentType(): string
     {
-        return match($this) {
+        return match ($this) {
             Format::Xlsx => 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
             Format::Pdf => 'application/pdf',
             Format::Html => 'text/html',
diff --git a/src/GridService.php b/src/GridService.php
index 7b6eb13..ea8ff4a 100644
--- a/src/GridService.php
+++ b/src/GridService.php
@@ -61,7 +61,7 @@ public function __construct(GridInterface $driver = new \AnourValar\Office\Drive
      * Generate a document from the template (grid)
      *
      * @param array $headers
-     * @param iterable|\Closure<iterable> $data
+     * @param iterable|\Closure $data
      * @param string $leftTopCorner
      * @return \AnourValar\Office\Generated
      */
diff --git a/src/Mixer.php b/src/Mixer.php
index 1b4549e..e93c607 100644
--- a/src/Mixer.php
+++ b/src/Mixer.php
@@ -45,7 +45,7 @@ public function __invoke(...$generated): Generated
             for ($i = 0; $i < $count; $i++) {
                 $driver->setSheet($i);
 
-                $driver->setSheetTitle( $titles[] = $this->getTitle($driver->getSheetTitle(), $titles) );
+                $driver->setSheetTitle($titles[] = $this->getTitle($driver->getSheetTitle(), $titles));
                 $referenceDriver->mergeDriver($driver);
             }
         }
diff --git a/src/Sheets/Parser.php b/src/Sheets/Parser.php
index 9e15510..8dbb285 100644
--- a/src/Sheets/Parser.php
+++ b/src/Sheets/Parser.php
@@ -223,7 +223,7 @@ protected function calculateDataSchema(
                     $qty = 0;
                     $pattern = $markerName;
                     while (array_key_exists($pattern = $this->increment($pattern, true), $data)) {
-                         $qty++;
+                        $qty++;
                     }
                     $additionRows = max($additionRows, $qty);
 
diff --git a/tests/GridServiceTest.php b/tests/GridServiceTest.php
index 602dbfd..3375564 100644
--- a/tests/GridServiceTest.php
+++ b/tests/GridServiceTest.php
@@ -583,8 +583,7 @@ public function test_generate_statistic_without_headers_with_shift()
      */
     protected function getDriver(): \AnourValar\Office\Drivers\GridInterface
     {
-        return new class implements \AnourValar\Office\Drivers\GridInterface
-        {
+        return new class () implements \AnourValar\Office\Drivers\GridInterface {
             public function create(): self
             {
                 return $this;
diff --git a/tests/SheetsParserTest.php b/tests/SheetsParserTest.php
index 26ba8ff..e08c247 100644
--- a/tests/SheetsParserTest.php
+++ b/tests/SheetsParserTest.php
@@ -281,10 +281,14 @@ public function test_schema_not_scalar()
                 ],
 
                 'data' => [
-                    'foo' => function () {},
+                    'foo' => function () {
+                    },
                     'baz' => new \DateTime('2022-11-16'),
-                    'test' => function () {},
-                    'test2' => function () { throw new \LogicException('oops'); },
+                    'test' => function () {
+                    },
+                    'test2' => function () {
+                        throw new \LogicException('oops');
+                    },
                 ],
             ],
         ];
@@ -337,13 +341,14 @@ public function test_schema_not_scalar()
 
                 'copy_width' => [],
             ],
-            $this->service->schema([1 => ['A' => 'hello [world]']], ['world' => function () {}], [])->toArray()
+            $this->service->schema([1 => ['A' => 'hello [world]']], ['world' => function () {
+            }], [])->toArray()
         );
     }
 
-   /**
-     * @return void
-     */
+    /**
+      * @return void
+      */
     public function test_schema_conditions1()
     {
         $data = [
@@ -403,9 +408,9 @@ public function test_schema_conditions1()
         }
     }
 
-   /**
-     * @return void
-     */
+    /**
+      * @return void
+      */
     public function test_schema_conditions2()
     {
         $data = [