diff --git a/composer.json b/composer.json
index 6987607..087827e 100644
--- a/composer.json
+++ b/composer.json
@@ -7,7 +7,8 @@
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         "newsuk/nuk-wp-phpcs-config": "^0.1.0",
-        "newsuk/nuk-wp-phpstan-config": "^0.1.0"
+        "newsuk/nuk-wp-phpstan-config": "^0.1.0",
+        "newsuk/nuk-wp-phpmd-config": "^0.1.0"
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@@ -30,6 +31,7 @@
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         "phpstan": "phpstan analyse --memory-limit=2048M",
-        "phpstan-baseline": "phpstan analyse -b --allow-empty-baseline --memory-limit=2048M"
+        "phpstan-baseline": "phpstan analyse -b --allow-empty-baseline --memory-limit=2048M",
+        "phpmd": "phpmd plugin.php,includes text phpmd.xml.dist --color"
     }
 }
diff --git a/composer.lock b/composer.lock
index 5e620fd..77f8f56 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
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-    "content-hash": "5da2cb993d9cfea91e179677c5481efa",
+    "content-hash": "10c64252fc2a1288e32dd26c50255f8b",
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@@ -179,6 +179,143 @@
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+                    "email": "j.boggiano@seld.be",
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+                    "email": "john-stevenson@blueyonder.co.uk"
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+            "description": "Restarts a process without Xdebug.",
+            "keywords": [
+                "Xdebug",
+                "performance"
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+            },
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+                    "type": "github"
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+            "time": "2022-02-25T21:32:43+00:00"
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@@ -616,6 +753,41 @@
             },
             "time": "2024-01-16T15:38:00+00:00"
         },
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+            "name": "newsuk/nuk-wp-phpmd-config",
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+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
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+            "authors": [
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+                    "name": "Content Platforms",
+                    "email": "contentplatforms@news.co.uk"
+                }
+            ],
+            "description": "PHPMD configuration for WordPress VIP plugins and themes",
+            "support": {
+                "issues": "https://github.com/newsuk/nuk-wp-phpmd-config/issues",
+                "source": "https://github.com/newsuk/nuk-wp-phpmd-config/tree/v0.1.0"
+            },
+            "time": "2024-01-15T13:59:02+00:00"
+        },
         {
             "name": "newsuk/nuk-wp-phpstan-config",
             "version": "v0.1.0",
@@ -714,6 +886,69 @@
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             "time": "2024-01-07T17:17:35+00:00"
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+            "version": "2.16.2",
+            "source": {
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+                "url": "https://github.com/pdepend/pdepend.git",
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+                "reference": "f942b208dc2a0868454d01b29f0c75bbcfc6ed58",
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+                "gregwar/rst": "^1.0",
+                "squizlabs/php_codesniffer": "^2.0.0"
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+                "src/bin/pdepend"
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+            "description": "Official version of pdepend to be handled with Composer",
+            "keywords": [
+                "PHP Depend",
+                "PHP_Depend",
+                "dev",
+                "pdepend"
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             "version": "2.0.3",
@@ -1274,6 +1509,89 @@
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             "time": "2023-12-08T14:50:00+00:00"
         },
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+                "ext-json": "*",
+                "ext-simplexml": "*",
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+                    "email": "github@manuel-pichler.de",
+                    "homepage": "https://github.com/manuelpichler",
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+                {
+                    "name": "Marc Würth",
+                    "email": "ravage@bluewin.ch",
+                    "homepage": "https://github.com/ravage84",
+                    "role": "Project Maintainer"
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+                    "name": "Other contributors",
+                    "homepage": "https://github.com/phpmd/phpmd/graphs/contributors",
+                    "role": "Contributors"
+                }
+            ],
+            "description": "PHPMD is a spin-off project of PHP Depend and aims to be a PHP equivalent of the well known Java tool PMD.",
+            "homepage": "https://phpmd.org/",
+            "keywords": [
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+                "mess detector",
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@@ -1947,106 +2265,209 @@
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-                    "email": "sebastian@phpunit.de",
-                    "role": "lead"
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-            "homepage": "https://github.com/sebastianbergmann/cli-parser",
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+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Nicolas Grekas",
+                    "email": "p@tchwork.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Allows exporting any serializable PHP data structure to plain PHP code",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "clone",
+                "construct",
+                "export",
+                "hydrate",
+                "instantiate",
+                "lazy-loading",
+                "proxy",
+                "serialize"
+            ],
+            "support": {
+                "source": "https://github.com/symfony/var-exporter/tree/v6.4.3"
+            },
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2024-01-23T14:51:35+00:00"
         },
         {
             "name": "szepeviktor/phpstan-wordpress",
diff --git a/includes/Api/Flags.php b/includes/Api/Flags.php
index a01065b..4f48f6f 100644
--- a/includes/Api/Flags.php
+++ b/includes/Api/Flags.php
@@ -87,7 +87,7 @@ public function post_flags( WP_REST_Request $request ) {
 		$flags = $request->get_json_params();
 
 		if ( count( $flags ) > 0 ) {
-			$result = update_option( self::$option_name, $flags );
+			update_option( self::$option_name, $flags );
 			return rest_ensure_response(
 				array(
 					'status'  => 200,
@@ -114,8 +114,8 @@ public function validate_flag_input( $param ) {
 			return true;
 		}
 
-		foreach ( $input_data as $flag_key => $flag ) {
-			foreach ( $valid_keys as $key => $value ) {
+		foreach ( $input_data as $flag ) {
+			foreach ( $valid_keys as $value ) {
 				if ( ! array_key_exists( $value, $flag ) ) {
 					return false;
 				}
diff --git a/includes/Flag.php b/includes/Flag.php
index 40f7ecc..b344452 100644
--- a/includes/Flag.php
+++ b/includes/Flag.php
@@ -36,7 +36,8 @@ class Flag {
 	public static function is_enabled( string $flag ): bool {
 		$flags = get_option( self::$option_name );
 
-		if ( Helper::search_flag( $flags, 'name', $flag ) ) {
+		$helper = new Helper();
+		if ( $helper->search_flag( $flags, 'name', $flag ) ) {
 			return true;
 		}
 
diff --git a/includes/Helper.php b/includes/Helper.php
index 60dae19..66b3c26 100644
--- a/includes/Helper.php
+++ b/includes/Helper.php
@@ -27,9 +27,9 @@ class Helper {
 	 * @return boolean
 	 * @since 1.0.0
 	 */
-	public static function search_flag( $flags, $field, $flag ) {
+	public function search_flag( $flags, $field, $flag ) {
 		if ( is_array( $flags ) ) {
-			foreach ( $flags as $key => $value ) {
+			foreach ( $flags as $value ) {
 				if ( $value[ $field ] === $flag && true === $value['enabled'] ) {
 					return true;
 				}
diff --git a/phpmd.xml.dist b/phpmd.xml.dist
new file mode 100644
index 0000000..f4f5db6
--- /dev/null
+++ b/phpmd.xml.dist
@@ -0,0 +1,4 @@
+<?xml version="1.0"?>
+<ruleset>
+    <rule ref="vendor/newsuk/nuk-wp-phpmd-config/ruleset.xml" />
+</ruleset>
diff --git a/tests/Unit/HelperTest.php b/tests/Unit/HelperTest.php
index dc57f3e..0978f77 100644
--- a/tests/Unit/HelperTest.php
+++ b/tests/Unit/HelperTest.php
@@ -16,22 +16,26 @@ protected function tearDown():void
     }
 
 	public function test_search_flag_method_should_return_true_if_flag_name_present_and_enabled() {
-		$result = Helper::search_flag([['id'=>1, 'name'=>'Test','enabled'=>true]],'name','Test');
+		$helper = new Helper();
+		$result = $helper->search_flag([['id'=>1, 'name'=>'Test','enabled'=>true]],'name','Test');
 		$this->assertTrue($result);
 	}
 
 	public function test_search_flag_method_should_return_false_if_flags_are_empty() {
-		$result = Helper::search_flag([],'name','Test');
+		$helper = new Helper();
+		$result = $helper->search_flag([],'name','Test');
 		$this->assertFalse($result);
 	}
 
 	public function test_search_flag_method_should_return_false_if_flag_name_present_but_disabled() {
-		$result = Helper::search_flag([],'name','Test');
+		$helper = new Helper();
+		$result = $helper->search_flag([],'name','Test');
 		$this->assertFalse($result);
 	}
 
 	public function test_search_flag_method_should_return_false_if_flag_not_present() {
-		$result = Helper::search_flag([['id'=>1, 'name'=>'Test','enabled'=>true]],'name','Test1');
+		$helper = new Helper();
+		$result = $helper->search_flag([['id'=>1, 'name'=>'Test','enabled'=>true]],'name','Test1');
 		$this->assertFalse($result);
 	}
 }