Add PHP linter and PHP linting in GitHub Actions

.github/workflows/php-coding-standards.yml

@@ -0,0 +1,44 @@
+name: PHP Coding Standards
+
+on:
+  push:
+    branches:
+      - "trunk"
+    paths:
+      - "**.php"
+      - .github/workflows/php-coding-standards.yml
+  pull_request:
+    paths:
+      - "**.php"
+      - .github/workflows/php-coding-standards.yml
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  phpcs:
+    name: PHP coding standards
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Prepare PHP
+        uses: woocommerce/grow/prepare-php@actions-v1
+        with:
+          php-version: 7.4
+          tools: cs2pr
+          install-deps: "no"
+
+      - name: Install Composer dependencies
+        run: |
+          # Skip installing packages from private repos.
+          composer remove --dev woocommerce/woorelease
+          composer install --prefer-dist --no-interaction
+
+      - name: Log PHPCS information
+        run: vendor/bin/phpcs -i
+
+      - name: Run PHPCS on all files
+        run: vendor/bin/phpcs -q --report=checkstyle | cs2pr

README.md

@@ -1,6 +1,7 @@
 # Grow Packages
 
 [![JavaScript Linting](https://github.com/woocommerce/grow/actions/workflows/js-linting.yml/badge.svg)](https://github.com/woocommerce/grow/actions/workflows/js-linting.yml)
+[![PHP Coding Standards](https://github.com/woocommerce/grow/actions/workflows/php-coding-standards.yml/badge.svg)](https://github.com/woocommerce/grow/actions/workflows/php-coding-standards.yml)
 
 This repository is a container for packages, mostly dev tools to serve the Grow Team.
 The packages here are too experimental or too Grow-specific to be shared Woo-wide.

composer.json

@@ -12,7 +12,9 @@
 		"phpcompatibility/php-compatibility": "^9.0",
 		"php-parallel-lint/php-parallel-lint": "^1.3.1",
 		"woocommerce/woorelease": "^2.4",
-		"yoast/phpunit-polyfills": "^1.0"
+		"yoast/phpunit-polyfills": "^1.0",
+		"dealerdirect/phpcodesniffer-composer-installer": "^1.0",
+		"wp-coding-standards/wpcs": "^3.0"
 	},
 	"repositories": [
 		{
@@ -38,5 +40,10 @@
 	"scripts-descriptions": {
 		"assumeReleaseUnchanged": "Tell Git to assume that the 'release.txt' file is unchanged. This allows changes in this file to be ignored by Git.",
 		"noAssumeReleaseUnchanged": "Tell Git to stop assuming that the 'release.txt' file is unchanged, and track it normally."
+	},
+	"config": {
+		"allow-plugins": {
+			"dealerdirect/phpcodesniffer-composer-installer": true
+		}
 	}
 }