diff --git a/.github/workflows/php.yml b/.github/workflows/php.yml
index d104ca3..f9360b1 100644
--- a/.github/workflows/php.yml
+++ b/.github/workflows/php.yml
@@ -10,27 +10,37 @@ jobs:
   build:
 
     runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        php: [ 8.1, 8.2 ]
+
+    name: PHP ${{ matrix.php }} tests
 
     steps:
-    - uses: actions/checkout@v2
+      - uses: shivammathur/setup-php@15c43e89cdef867065b0213be354c2841860869e
+        with:
+          php-version: ${{ matrix.php }}
+
+      - uses: actions/checkout@v3
 
-    - name: Validate composer.json and composer.lock
-      run: composer validate --strict
+      - name: Validate composer.json and composer.lock
+        run: composer validate --strict
 
-    - name: Cache Composer packages
-      id: composer-cache
-      uses: actions/cache@v2
-      with:
-        path: vendor
-        key: ${{ runner.os }}-php-${{ hashFiles('**/composer.lock') }}
-        restore-keys: |
-          ${{ runner.os }}-php-
+      - name: Cache Composer packages
+        id: composer-cache
+        uses: actions/cache@v2
+        with:
+          path: vendor
+          key: ${{ runner.os }}-php-${{ hashFiles('**/composer.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-php-
 
-    - name: Install dependencies
-      run: composer install --prefer-dist --no-progress
+      - name: Install dependencies
+        run: composer install --prefer-dist --no-progress
 
-    # Add a test script to composer.json, for instance: "test": "vendor/bin/phpunit"
-    # Docs: https://getcomposer.org/doc/articles/scripts.md
+      # Add a test script to composer.json, for instance: "test": "vendor/bin/phpunit"
+      # Docs: https://getcomposer.org/doc/articles/scripts.md
 
-    - name: Run test suite
-      run: composer run-script test
+      - name: Run test suite
+        run: composer run-script test
diff --git a/composer.json b/composer.json
index b9a3c8a..60331cf 100644
--- a/composer.json
+++ b/composer.json
@@ -19,7 +19,7 @@
     }
   ],
   "require": {
-    "php": ">=7.4",
+    "php": ">=8.1",
     "adbario/php-dot-notation": "^2.2"
   },
   "require-dev": {
diff --git a/composer.lock b/composer.lock
index d47d282..363a7d7 100644
--- a/composer.lock
+++ b/composer.lock
@@ -1,32 +1,32 @@
 {
-    "_readme": [
-        "This file locks the dependencies of your project to a known state",
-        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
-        "This file is @generated automatically"
-    ],
-    "content-hash": "8639ce7e8cd7e8973d4f6e2123ca046b",
-    "packages": [
-        {
-            "name": "adbario/php-dot-notation",
-            "version": "2.2.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/adbario/php-dot-notation.git",
-                "reference": "eee4fc81296531e6aafba4c2bbccfc5adab1676e"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/adbario/php-dot-notation/zipball/eee4fc81296531e6aafba4c2bbccfc5adab1676e",
-                "reference": "eee4fc81296531e6aafba4c2bbccfc5adab1676e",
-                "shasum": ""
-            },
+  "_readme": [
+    "This file locks the dependencies of your project to a known state",
+    "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
+    "This file is @generated automatically"
+  ],
+  "content-hash": "9c1758acc07c28378bd429aff8b859c8",
+  "packages": [
+    {
+      "name": "adbario/php-dot-notation",
+      "version": "2.5.0",
+      "source": {
+        "type": "git",
+        "url": "https://github.com/adbario/php-dot-notation.git",
+        "reference": "081e2cca50c84bfeeea2e3ef9b2c8d206d80ccae"
+      },
+      "dist": {
+        "type": "zip",
+        "url": "https://api.github.com/repos/adbario/php-dot-notation/zipball/081e2cca50c84bfeeea2e3ef9b2c8d206d80ccae",
+        "reference": "081e2cca50c84bfeeea2e3ef9b2c8d206d80ccae",
+        "shasum": ""
+      },
             "require": {
                 "ext-json": "*",
-                "php": ">=5.5"
+              "php": "^5.5 || ^7.0 || ^8.0"
             },
             "require-dev": {
-                "phpunit/phpunit": "^4.0|^5.0|^6.0",
-                "squizlabs/php_codesniffer": "^3.0"
+              "phpunit/phpunit": "^4.8|^5.7|^6.6|^7.5|^8.5|^9.5",
+              "squizlabs/php_codesniffer": "^3.6"
             },
             "type": "library",
             "autoload": {
@@ -55,38 +55,38 @@
             ],
             "support": {
                 "issues": "https://github.com/adbario/php-dot-notation/issues",
-                "source": "https://github.com/adbario/php-dot-notation/tree/2.x"
+              "source": "https://github.com/adbario/php-dot-notation/tree/2.5.0"
             },
-            "time": "2019-01-01T23:59:15+00:00"
+      "time": "2022-10-14T20:31:46+00:00"
         }
     ],
     "packages-dev": [
-        {
-            "name": "doctrine/instantiator",
-            "version": "1.4.1",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/doctrine/instantiator.git",
-                "reference": "10dcfce151b967d20fde1b34ae6640712c3891bc"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/doctrine/instantiator/zipball/10dcfce151b967d20fde1b34ae6640712c3891bc",
-                "reference": "10dcfce151b967d20fde1b34ae6640712c3891bc",
-                "shasum": ""
-            },
+      {
+        "name": "doctrine/instantiator",
+        "version": "1.5.0",
+        "source": {
+          "type": "git",
+          "url": "https://github.com/doctrine/instantiator.git",
+          "reference": "0a0fa9780f5d4e507415a065172d26a98d02047b"
+        },
+        "dist": {
+          "type": "zip",
+          "url": "https://api.github.com/repos/doctrine/instantiator/zipball/0a0fa9780f5d4e507415a065172d26a98d02047b",
+          "reference": "0a0fa9780f5d4e507415a065172d26a98d02047b",
+          "shasum": ""
+        },
             "require": {
                 "php": "^7.1 || ^8.0"
             },
             "require-dev": {
-                "doctrine/coding-standard": "^9",
-                "ext-pdo": "*",
-                "ext-phar": "*",
-                "phpbench/phpbench": "^0.16 || ^1",
-                "phpstan/phpstan": "^1.4",
-                "phpstan/phpstan-phpunit": "^1",
-                "phpunit/phpunit": "^7.5 || ^8.5 || ^9.5",
-                "vimeo/psalm": "^4.22"
+              "doctrine/coding-standard": "^9 || ^11",
+              "ext-pdo": "*",
+              "ext-phar": "*",
+              "phpbench/phpbench": "^0.16 || ^1",
+              "phpstan/phpstan": "^1.4",
+              "phpstan/phpstan-phpunit": "^1",
+              "phpunit/phpunit": "^7.5 || ^8.5 || ^9.5",
+              "vimeo/psalm": "^4.30 || ^5.4"
             },
             "type": "library",
             "autoload": {
@@ -113,7 +113,7 @@
             ],
             "support": {
                 "issues": "https://github.com/doctrine/instantiator/issues",
-                "source": "https://github.com/doctrine/instantiator/tree/1.4.1"
+              "source": "https://github.com/doctrine/instantiator/tree/1.5.0"
             },
             "funding": [
                 {
@@ -129,7 +129,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2022-03-03T08:28:38+00:00"
+        "time": "2022-12-30T00:15:36+00:00"
         },
         {
             "name": "myclabs/deep-copy",
@@ -190,20 +190,20 @@
             ],
             "time": "2022-03-03T13:19:32+00:00"
         },
-        {
-            "name": "nikic/php-parser",
-            "version": "v4.13.2",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/nikic/PHP-Parser.git",
-                "reference": "210577fe3cf7badcc5814d99455df46564f3c077"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/nikic/PHP-Parser/zipball/210577fe3cf7badcc5814d99455df46564f3c077",
-                "reference": "210577fe3cf7badcc5814d99455df46564f3c077",
-                "shasum": ""
-            },
+      {
+        "name": "nikic/php-parser",
+        "version": "v4.15.2",
+        "source": {
+          "type": "git",
+          "url": "https://github.com/nikic/PHP-Parser.git",
+          "reference": "f59bbe44bf7d96f24f3e2b4ddc21cd52c1d2adbc"
+        },
+        "dist": {
+          "type": "zip",
+          "url": "https://api.github.com/repos/nikic/PHP-Parser/zipball/f59bbe44bf7d96f24f3e2b4ddc21cd52c1d2adbc",
+          "reference": "f59bbe44bf7d96f24f3e2b4ddc21cd52c1d2adbc",
+          "shasum": ""
+        },
             "require": {
                 "ext-tokenizer": "*",
                 "php": ">=7.0"
@@ -242,9 +242,9 @@
             ],
             "support": {
                 "issues": "https://github.com/nikic/PHP-Parser/issues",
-                "source": "https://github.com/nikic/PHP-Parser/tree/v4.13.2"
+              "source": "https://github.com/nikic/PHP-Parser/tree/v4.15.2"
             },
-            "time": "2021-11-30T19:35:32+00:00"
+        "time": "2022-11-12T15:38:23+00:00"
         },
         {
             "name": "phar-io/manifest",
@@ -357,261 +357,34 @@
             },
             "time": "2022-02-21T01:04:05+00:00"
         },
-        {
-            "name": "phpdocumentor/reflection-common",
-            "version": "2.2.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/phpDocumentor/ReflectionCommon.git",
-                "reference": "1d01c49d4ed62f25aa84a747ad35d5a16924662b"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/phpDocumentor/ReflectionCommon/zipball/1d01c49d4ed62f25aa84a747ad35d5a16924662b",
-                "reference": "1d01c49d4ed62f25aa84a747ad35d5a16924662b",
-                "shasum": ""
-            },
-            "require": {
-                "php": "^7.2 || ^8.0"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-2.x": "2.x-dev"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "phpDocumentor\\Reflection\\": "src/"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Jaap van Otterdijk",
-                    "email": "opensource@ijaap.nl"
-                }
-            ],
-            "description": "Common reflection classes used by phpdocumentor to reflect the code structure",
-            "homepage": "http://www.phpdoc.org",
-            "keywords": [
-                "FQSEN",
-                "phpDocumentor",
-                "phpdoc",
-                "reflection",
-                "static analysis"
-            ],
-            "support": {
-                "issues": "https://github.com/phpDocumentor/ReflectionCommon/issues",
-                "source": "https://github.com/phpDocumentor/ReflectionCommon/tree/2.x"
-            },
-            "time": "2020-06-27T09:03:43+00:00"
-        },
-        {
-            "name": "phpdocumentor/reflection-docblock",
-            "version": "5.3.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/phpDocumentor/ReflectionDocBlock.git",
-                "reference": "622548b623e81ca6d78b721c5e029f4ce664f170"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/phpDocumentor/ReflectionDocBlock/zipball/622548b623e81ca6d78b721c5e029f4ce664f170",
-                "reference": "622548b623e81ca6d78b721c5e029f4ce664f170",
-                "shasum": ""
-            },
-            "require": {
-                "ext-filter": "*",
-                "php": "^7.2 || ^8.0",
-                "phpdocumentor/reflection-common": "^2.2",
-                "phpdocumentor/type-resolver": "^1.3",
-                "webmozart/assert": "^1.9.1"
-            },
-            "require-dev": {
-                "mockery/mockery": "~1.3.2",
-                "psalm/phar": "^4.8"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "5.x-dev"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "phpDocumentor\\Reflection\\": "src"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Mike van Riel",
-                    "email": "me@mikevanriel.com"
-                },
-                {
-                    "name": "Jaap van Otterdijk",
-                    "email": "account@ijaap.nl"
-                }
-            ],
-            "description": "With this component, a library can provide support for annotations via DocBlocks or otherwise retrieve information that is embedded in a DocBlock.",
-            "support": {
-                "issues": "https://github.com/phpDocumentor/ReflectionDocBlock/issues",
-                "source": "https://github.com/phpDocumentor/ReflectionDocBlock/tree/5.3.0"
-            },
-            "time": "2021-10-19T17:43:47+00:00"
-        },
-        {
-            "name": "phpdocumentor/type-resolver",
-            "version": "1.6.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/phpDocumentor/TypeResolver.git",
-                "reference": "93ebd0014cab80c4ea9f5e297ea48672f1b87706"
-            },
-            "dist": {
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-                "reference": "93ebd0014cab80c4ea9f5e297ea48672f1b87706",
-                "shasum": ""
-            },
-            "require": {
-                "php": "^7.2 || ^8.0",
-                "phpdocumentor/reflection-common": "^2.0"
-            },
-            "require-dev": {
-                "ext-tokenizer": "*",
-                "psalm/phar": "^4.8"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-1.x": "1.x-dev"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "phpDocumentor\\Reflection\\": "src"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
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-                    "name": "Mike van Riel",
-                    "email": "me@mikevanriel.com"
-                }
-            ],
-            "description": "A PSR-5 based resolver of Class names, Types and Structural Element Names",
-            "support": {
-                "issues": "https://github.com/phpDocumentor/TypeResolver/issues",
-                "source": "https://github.com/phpDocumentor/TypeResolver/tree/1.6.0"
-            },
-            "time": "2022-01-04T19:58:01+00:00"
+      {
+        "name": "phpunit/php-code-coverage",
+        "version": "9.2.23",
+        "source": {
+          "type": "git",
+          "url": "https://github.com/sebastianbergmann/php-code-coverage.git",
+          "reference": "9f1f0f9a2fbb680b26d1cf9b61b6eac43a6e4e9c"
         },
-        {
-            "name": "phpspec/prophecy",
-            "version": "v1.15.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/phpspec/prophecy.git",
-                "reference": "bbcd7380b0ebf3961ee21409db7b38bc31d69a13"
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-                "php": "^7.2 || ~8.0, <8.2",
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-                "sebastian/comparator": "^3.0 || ^4.0",
-                "sebastian/recursion-context": "^3.0 || ^4.0"
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-            "require-dev": {
-                "phpspec/phpspec": "^6.0 || ^7.0",
-                "phpunit/phpunit": "^8.0 || ^9.0"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "1.x-dev"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "Prophecy\\": "src/Prophecy"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Konstantin Kudryashov",
-                    "email": "ever.zet@gmail.com",
-                    "homepage": "http://everzet.com"
-                },
-                {
-                    "name": "Marcello Duarte",
-                    "email": "marcello.duarte@gmail.com"
-                }
-            ],
-            "description": "Highly opinionated mocking framework for PHP 5.3+",
-            "homepage": "https://github.com/phpspec/prophecy",
-            "keywords": [
-                "Double",
-                "Dummy",
-                "fake",
-                "mock",
-                "spy",
-                "stub"
-            ],
-            "support": {
-                "issues": "https://github.com/phpspec/prophecy/issues",
-                "source": "https://github.com/phpspec/prophecy/tree/v1.15.0"
-            },
-            "time": "2021-12-08T12:19:24+00:00"
+        "dist": {
+          "type": "zip",
+          "url": "https://api.github.com/repos/sebastianbergmann/php-code-coverage/zipball/9f1f0f9a2fbb680b26d1cf9b61b6eac43a6e4e9c",
+          "reference": "9f1f0f9a2fbb680b26d1cf9b61b6eac43a6e4e9c",
+          "shasum": ""
         },
-        {
-            "name": "phpunit/php-code-coverage",
-            "version": "9.2.15",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/sebastianbergmann/php-code-coverage.git",
-                "reference": "2e9da11878c4202f97915c1cb4bb1ca318a63f5f"
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-            "dist": {
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-                "url": "https://api.github.com/repos/sebastianbergmann/php-code-coverage/zipball/2e9da11878c4202f97915c1cb4bb1ca318a63f5f",
-                "reference": "2e9da11878c4202f97915c1cb4bb1ca318a63f5f",
-                "shasum": ""
-            },
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-                "ext-dom": "*",
-                "ext-libxml": "*",
-                "ext-xmlwriter": "*",
-                "nikic/php-parser": "^4.13.0",
-                "php": ">=7.3",
-                "phpunit/php-file-iterator": "^3.0.3",
-                "phpunit/php-text-template": "^2.0.2",
-                "sebastian/code-unit-reverse-lookup": "^2.0.2",
-                "sebastian/complexity": "^2.0",
-                "sebastian/environment": "^5.1.2",
-                "sebastian/lines-of-code": "^1.0.3",
-                "sebastian/version": "^3.0.1",
-                "theseer/tokenizer": "^1.2.0"
+              "ext-dom": "*",
+              "ext-libxml": "*",
+              "ext-xmlwriter": "*",
+              "nikic/php-parser": "^4.14",
+              "php": ">=7.3",
+              "phpunit/php-file-iterator": "^3.0.3",
+              "phpunit/php-text-template": "^2.0.2",
+              "sebastian/code-unit-reverse-lookup": "^2.0.2",
+              "sebastian/complexity": "^2.0",
+              "sebastian/environment": "^5.1.2",
+              "sebastian/lines-of-code": "^1.0.3",
+              "sebastian/version": "^3.0.1",
+              "theseer/tokenizer": "^1.2.0"
             },
             "require-dev": {
                 "phpunit/phpunit": "^9.3"
@@ -651,7 +424,7 @@
             ],
             "support": {
                 "issues": "https://github.com/sebastianbergmann/php-code-coverage/issues",
-                "source": "https://github.com/sebastianbergmann/php-code-coverage/tree/9.2.15"
+              "source": "https://github.com/sebastianbergmann/php-code-coverage/tree/9.2.23"
             },
             "funding": [
                 {
@@ -659,7 +432,7 @@
                     "type": "github"
                 }
             ],
-            "time": "2022-03-07T09:28:20+00:00"
+        "time": "2022-12-28T12:41:10+00:00"
         },
         {
             "name": "phpunit/php-file-iterator",
@@ -902,20 +675,20 @@
             ],
             "time": "2020-10-26T13:16:10+00:00"
         },
-        {
-            "name": "phpunit/phpunit",
-            "version": "9.5.19",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/sebastianbergmann/phpunit.git",
-                "reference": "35ea4b7f3acabb26f4bb640f8c30866c401da807"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/35ea4b7f3acabb26f4bb640f8c30866c401da807",
-                "reference": "35ea4b7f3acabb26f4bb640f8c30866c401da807",
-                "shasum": ""
-            },
+      {
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@@ -1172,20 +944,20 @@
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@@ -1236,7 +1008,7 @@
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@@ -1244,7 +1016,7 @@
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@@ -1369,20 +1141,20 @@
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@@ -1422,7 +1194,7 @@
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@@ -1969,102 +1741,20 @@
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@@ -2077,7 +1767,7 @@
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@@ -2116,7 +1806,7 @@
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@@ -2204,7 +1894,7 @@
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@@ -2271,64 +1961,6 @@
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@@ -2337,10 +1969,10 @@
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diff --git a/src/CustomValidator.php b/src/CustomValidator.php
index 80daee3..baafbf7 100644
--- a/src/CustomValidator.php
+++ b/src/CustomValidator.php
@@ -11,7 +11,7 @@ class CustomValidator
 
     /**
      * @param string $key
-     * @param $value
+     * @param        $value
      */
     public function __construct(string $key, $value)
     {
diff --git a/src/ValidationError.php b/src/ValidationError.php
index b969f63..b216173 100644
--- a/src/ValidationError.php
+++ b/src/ValidationError.php
@@ -18,6 +18,7 @@ class ValidationError
         ValidationRules::MATCH => "The field %s must be equal to the value of %s",
         ValidationRules::EQUAL => "The field %s must be equal to %s",
         ValidationRules::ARRAY => "The field %s must be an array",
+        ValidationRules::LIST => "The field %s must be a list",
         ValidationRules::BOOLEAN => "The field %s must be a boolean",
         ValidationRules::BETWEEN => "The field %s must contain between %d and %d characters",
         ValidationRules::PATTERN => "The field %s must follow the following pattern %s",
@@ -27,7 +28,7 @@ class ValidationError
     /**
      * @param string $key
      * @param string $rule
-     * @param array $attributes
+     * @param array  $attributes
      */
     public function __construct(string $key, string $rule, array $attributes)
     {
diff --git a/src/ValidationRules.php b/src/ValidationRules.php
index bacd98d..207e2c9 100644
--- a/src/ValidationRules.php
+++ b/src/ValidationRules.php
@@ -5,17 +5,18 @@
 class ValidationRules
 {
 
-    const NOT_NULL = "not-null";
-    const REQUIRED = "required";
-    const NOT_EMPTY = "not-empty";
-    const LENGTH = "length";
-    const DATE_TIME = "date-time";
-    const MATCH = "match";
-    const EQUAL = "equal";
     const ARRAY = "array";
-    const BOOLEAN = "boolean";
     const BETWEEN = "between";
-    const PATTERN = "pattern";
+    const BOOLEAN = "boolean";
     const CUSTOM = "custom";
+    const DATE_TIME = "date-time";
+    const EQUAL = "equal";
+    const LENGTH = "length";
+    const LIST = "list";
+    const MATCH = "match";
+    const NOT_EMPTY = "not-empty";
+    const NOT_NULL = "not-null";
+    const PATTERN = "pattern";
+    const REQUIRED = "required";
 
 }
\ No newline at end of file
diff --git a/src/Validator.php b/src/Validator.php
index 8088661..e2bed37 100644
--- a/src/Validator.php
+++ b/src/Validator.php
@@ -9,12 +9,14 @@ class Validator
 {
     /**
      * The body to validate
+     *
      * @var array
      */
     private array $body;
 
     /**
      * List of errors that occurred during the validation
+     *
      * @var ValidationError[]
      */
     private array $errors = [];
@@ -24,7 +26,7 @@ class Validator
      */
     public function __construct(?array $body)
     {
-        if ($body == null) {
+        if ($body == NULL) {
             $body = [];
         }
         $this->body = $body;
@@ -38,28 +40,17 @@ public function isValid(): bool
         return empty($this->errors);
     }
 
-    /**
-     * @return string[]
-     */
-    public function getErrors(): array
-    {
-        $errors = [];
-        foreach ($this->errors as $error) {
-            $errors[] = (string)$error;
-        }
-        return $errors;
-    }
-
     /**
      * Test if the keys are not null
      *
      * @param string ...$keys
+     *
      * @return $this
      */
     public function notNull(string  ...$keys): self
     {
         foreach ($keys as $key) {
-            if ($this->getValue($key) == null) {
+            if ($this->getValue($key) == NULL) {
                 $this->addError($key, ValidationRules::NOT_NULL);
             }
         }
@@ -68,9 +59,10 @@ public function notNull(string  ...$keys): self
 
     /**
      * @param string $key
+     *
      * @return mixed|null
      */
-    public function getValue(string $key, $default = null)
+    public function getValue(string $key, $default = NULL)
     {
         $dot = new Dot($this->body);
         return $dot->get($key, $default);
@@ -79,7 +71,8 @@ public function getValue(string $key, $default = null)
     /**
      * @param string $key
      * @param string $rule
-     * @param ...$attributes
+     * @param        ...$attributes
+     *
      * @return void
      */
     private function addError(string $key, string $rule, ...$attributes)
@@ -91,6 +84,7 @@ private function addError(string $key, string $rule, ...$attributes)
      * Test if the keys are present (required) and not empty
      *
      * @param string ...$keys
+     *
      * @return Validator
      */
     public function requiredAndNotEmpty(string ...$keys): self
@@ -102,6 +96,7 @@ public function requiredAndNotEmpty(string ...$keys): self
      * Test if the keys are not empty
      *
      * @param string ...$keys
+     *
      * @return $this
      */
     public function notEmpty(string ...$keys): self
@@ -118,6 +113,7 @@ public function notEmpty(string ...$keys): self
      * Test if the keys are present (required)
      *
      * @param string ...$keys
+     *
      * @return $this
      */
     public function required(string ...$keys): self
@@ -134,16 +130,17 @@ public function required(string ...$keys): self
     /**
      * Test if the key is the correct length
      *
-     * @param string $key
-     * @param int $min
+     * @param string   $key
+     * @param int      $min
      * @param int|null $max
+     *
      * @return $this
      */
     public function length(string $key, int $min, ?int $max = NULL): self
     {
         $value = $this->getValue($key);
 
-        if ($value == null) {
+        if ($value == NULL) {
             $this->addError($key, ValidationRules::LENGTH, $min, $max);
             return $this;
         }
@@ -153,7 +150,7 @@ public function length(string $key, int $min, ?int $max = NULL): self
             return $this;
         }
 
-        if ($max != null && strlen($value) > $max) {
+        if ($max != NULL && strlen($value) > $max) {
             $this->addError($key, ValidationRules::LENGTH, $min, $max);
             return $this;
         }
@@ -166,6 +163,7 @@ public function length(string $key, int $min, ?int $max = NULL): self
      *
      * @param string $key
      * @param string $format
+     *
      * @return $this
      */
     public function dateTime(string $key, string $format = 'Y-m-d H:i:s'): self
@@ -177,7 +175,7 @@ public function dateTime(string $key, string $format = 'Y-m-d H:i:s'): self
         // https://github.com/lefuturiste/validator/blob/9e4e653597437acb277b48167ebd6acbaef65a8f/src/Validator.php#L134
         $date = DateTime::createFromFormat($format, $this->getValue($key));
         $errors = DateTime::getLastErrors();
-        if ($errors['error_count'] > 0 || $errors['warning_count'] > 0 || $date == false) {
+        if (($errors && ($errors['error_count'] > 0 || $errors['warning_count'] > 0)) || !$date) {
             $this->addError($key, ValidationRules::DATE_TIME, $format);
         }
 
@@ -188,6 +186,7 @@ public function dateTime(string $key, string $format = 'Y-m-d H:i:s'): self
      * Test if the keys are valid slugs
      *
      * @param string ...$keys
+     *
      * @return $this
      */
     public function slug(string ...$keys): self
@@ -200,10 +199,27 @@ public function slug(string ...$keys): self
         return $this;
     }
 
+    /**
+     * Test if the key match the provided regex expression
+     *
+     * @param string $key
+     * @param string $pattern
+     *
+     * @return $this
+     */
+    public function patternMatch(string $key, string $pattern): self
+    {
+        if ($this->getValue($key) != NULL && !preg_match($pattern, $this->getValue($key))) {
+            $this->addError($key, ValidationRules::PATTERN, $pattern);
+        }
+        return $this;
+    }
+
     /**
      * Test if the keys are valid urls
      *
      * @param string ...$keys
+     *
      * @return $this
      */
     public function url(string ...$keys): self
@@ -219,8 +235,9 @@ public function url(string ...$keys): self
     /**
      * Test if the key match the provided value
      *
-     * @param string $key
+     * @param string     $key
      * @param null|mixed $expected
+     *
      * @return $this
      */
     public function match(string $key, $expected): self
@@ -237,6 +254,7 @@ public function match(string $key, $expected): self
      *
      * @param string $key
      * @param string $secondKey
+     *
      * @return $this
      */
     public function equal(string $key, string $secondKey): self
@@ -252,6 +270,7 @@ public function equal(string $key, string $secondKey): self
      * Test if the key is a valid email address
      *
      * @param string ...$keys
+     *
      * @return $this
      */
     public function email(string ...$keys): self
@@ -268,6 +287,7 @@ public function email(string ...$keys): self
      * Test if the keys are valid arrays
      *
      * @param string ...$keys
+     *
      * @return $this
      */
     public function array(string ...$keys): self
@@ -285,6 +305,7 @@ public function array(string ...$keys): self
      * Test if the keys are valid integers
      *
      * @param string ...$keys
+     *
      * @return $this
      */
     public function integer(string ...$keys): self
@@ -301,6 +322,7 @@ public function integer(string ...$keys): self
      * Test if the keys are valid float numbers
      *
      * @param string ...$keys
+     *
      * @return $this
      */
     public function float(string ...$keys): self
@@ -317,13 +339,14 @@ public function float(string ...$keys): self
      * Test if the keys are valid booleans
      *
      * @param string ...$keys
+     *
      * @return $this
      */
     public function boolean(string ...$keys): self
     {
         foreach ($keys as $key) {
             $value = $this->getValue($key);
-            if ($value !== null && !(
+            if ($value !== NULL && !(
                     ($value === false)
                     || ($value === true)
                     || ($value === 'false')
@@ -344,9 +367,10 @@ public function boolean(string ...$keys): self
      * Test if the key is between a provided range
      *
      * @param string $key
-     * @param int $min
-     * @param int $max
-     * @param bool $strict
+     * @param int    $min
+     * @param int    $max
+     * @param bool   $strict
+     *
      * @return $this
      */
     public function between(string $key, int $min, int $max, bool $strict = false): self
@@ -363,25 +387,11 @@ public function between(string $key, int $min, int $max, bool $strict = false):
         return $this;
     }
 
-    /**
-     * Test if the key match the provided regex expression
-     *
-     * @param string $key
-     * @param string $pattern
-     * @return $this
-     */
-    public function patternMatch(string $key, string $pattern): self
-    {
-        if ($this->getValue($key) != null && !preg_match($pattern, $this->getValue($key))) {
-            $this->addError($key, ValidationRules::PATTERN, $pattern);
-        }
-        return $this;
-    }
-
     /**
      * Test if the key is an alphanumerical value
      *
      * @param string ...$keys
+     *
      * @return $this
      */
     public function alphaNumerical(string ...$keys): self
@@ -396,8 +406,9 @@ public function alphaNumerical(string ...$keys): self
     /**
      * Test the key against a custom validation function
      *
-     * @param string $key
+     * @param string   $key
      * @param callable $function
+     *
      * @return $this
      */
     public function customValidation(string $key, callable $function): self
@@ -411,4 +422,25 @@ public function customValidation(string $key, callable $function): self
 
         return $this;
     }
+
+    /**
+     * @return string[]
+     */
+    public function getErrors(): array
+    {
+        $errors = [];
+        foreach ($this->errors as $error) {
+            $errors[] = (string)$error;
+        }
+        return $errors;
+    }
+
+    public function isList(string ...$keys)
+    {
+        foreach ($keys as $key) {
+            if (!empty($this->getValue($key)) && !array_is_list($this->getValue($key))) {
+                $this->addError($key, ValidationRules::LIST);
+            }
+        }
+    }
 }
\ No newline at end of file
diff --git a/tests/SimpleTest.php b/tests/SimpleTest.php
index cc63c2f..d7be342 100644
--- a/tests/SimpleTest.php
+++ b/tests/SimpleTest.php
@@ -13,7 +13,7 @@ public function testConstructor()
         $validator->notNull("abc");
         $this->assertCount(1, $validator->getErrors());
 
-        $validator = $this->createValidator(null); // Null body, everything should fail
+        $validator = $this->createValidator(NULL); // Null body, everything should fail
         $validator->notNull("abc");
         $this->assertCount(1, $validator->getErrors());
     }
@@ -24,7 +24,7 @@ public function testNotNull()
         $validator->notNull("abc");
         $this->assertCount(0, $validator->getErrors());
 
-        $validator = $this->createValidator(["abc" => null]);
+        $validator = $this->createValidator(["abc" => NULL]);
         $validator->notNull("abc");
         $this->assertCount(1, $validator->getErrors());
     }
@@ -219,4 +219,15 @@ public function testCustomValidation()
         $this->assertEquals("random", $validator->getErrors()[0], json_encode($validator->getErrors()));
     }
 
+    public function testList()
+    {
+        $validator = $this->createValidator(["abc" => ["abc", "def"]]);
+        $validator->isList("abc");
+        $this->assertCount(0, $validator->getErrors(), json_encode($validator->getErrors()));
+
+        $validator = $this->createValidator(["abc" => ["abc" => "def", "foo" => "bar"]]);
+        $validator->isList("abc");
+        $this->assertCount(1, $validator->getErrors(), json_encode($validator->getErrors()));
+    }
+
 }
\ No newline at end of file