diff --git a/.github/workflows/phpstan.yml b/.github/workflows/phpstan.yml
new file mode 100644
index 00000000..77560afd
--- /dev/null
+++ b/.github/workflows/phpstan.yml
@@ -0,0 +1,26 @@
+name: PHPStan
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Validate composer.json and composer.lock
+      run: composer validate
+    - 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
+      if: steps.composer-cache.outputs.cache-hit != 'true'
+      run: composer install --prefer-dist --no-progress --no-suggest
+    - name: Run phpstan
+      run: composer run-script phpstan
diff --git a/.gitignore b/.gitignore
index a4c3ecb8..259446a0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -15,3 +15,6 @@ test.html
 
 # vim
 *.swp
+
+# Composer
+/vendor/
diff --git a/composer.json b/composer.json
new file mode 100644
index 00000000..119e8c2e
--- /dev/null
+++ b/composer.json
@@ -0,0 +1,19 @@
+{
+    "name": "pi-hole/adminlte",
+    "type": "project",
+    "description": "Pi-hole Dashboard for stats and more",
+    "require": {
+        "php": ">=5.4",
+        "phpstan/phpstan": "^0.12.42"
+    },
+    "license": "EUPL-1.2",
+    "minimum-stability": "stable",
+    "autoload": {
+        "files": [
+            "scripts/vendor/qrcode.php"
+        ]
+    },
+    "scripts": {
+        "phpstan": "vendor/phpstan/phpstan/phpstan analyse -c phpstan.neon.dist"
+    }
+}
diff --git a/composer.lock b/composer.lock
new file mode 100644
index 00000000..bf03a77c
--- /dev/null
+++ b/composer.lock
@@ -0,0 +1,81 @@
+{
+    "_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": "ba7e1b2ae29157ca9224ed7c390d5b78",
+    "packages": [
+        {
+            "name": "phpstan/phpstan",
+            "version": "0.12.58",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phpstan/phpstan.git",
+                "reference": "2a4847df6047b30af28854ed9dc95304cdb56ae5"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/2a4847df6047b30af28854ed9dc95304cdb56ae5",
+                "reference": "2a4847df6047b30af28854ed9dc95304cdb56ae5",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.1|^8.0"
+            },
+            "conflict": {
+                "phpstan/phpstan-shim": "*"
+            },
+            "bin": [
+                "phpstan",
+                "phpstan.phar"
+            ],
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "0.12-dev"
+                }
+            },
+            "autoload": {
+                "files": [
+                    "bootstrap.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "PHPStan - PHP Static Analysis Tool",
+            "support": {
+                "issues": "https://github.com/phpstan/phpstan/issues",
+                "source": "https://github.com/phpstan/phpstan/tree/0.12.58"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/ondrejmirtes",
+                    "type": "github"
+                },
+                {
+                    "url": "https://www.patreon.com/phpstan",
+                    "type": "patreon"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/phpstan/phpstan",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2020-11-29T13:32:03+00:00"
+        }
+    ],
+    "packages-dev": [],
+    "aliases": [],
+    "minimum-stability": "stable",
+    "stability-flags": [],
+    "prefer-stable": false,
+    "prefer-lowest": false,
+    "platform": {
+        "php": ">=5.4"
+    },
+    "platform-dev": [],
+    "plugin-api-version": "2.0.0"
+}
diff --git a/phpstan.neon.dist b/phpstan.neon.dist
new file mode 100644
index 00000000..63d89285
--- /dev/null
+++ b/phpstan.neon.dist
@@ -0,0 +1,8 @@
+parameters:
+    level: 0
+    excludes_analyse:
+        - vendor
+    scanDirectories:
+        - .
+    paths:
+        - .