diff --git a/.github/workflows/phpcs_psr12.yml b/.github/workflows/phpcs_psr12.yml
new file mode 100644
index 0000000..6ecfb15
--- /dev/null
+++ b/.github/workflows/phpcs_psr12.yml
@@ -0,0 +1,21 @@
+name: "CI"
+
+on: [workflow_dispatch, pull_request]
+
+jobs:
+  phpcs:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0 # important!
+
+      # we may use whatever way to install phpcs, just specify the path on the next step
+      # however, curl seems to be the fastest
+      - name: Install PHP_CodeSniffer
+        run: |
+          curl -OL https://squizlabs.github.io/PHP_CodeSniffer/phpcs.phar
+          php phpcs.phar --version
+
+      - name: Run phpcs
+        run: php phpcs.phar --standard=PSR12 html