start with adding phpcs

.github/workflows/phpcs.yaml

@@ -0,0 +1,35 @@
+name: PHPCS check
+
+on:
+  pull_request: {}
+  workflow_dispatch: {}
+  push:
+    branches: ["main"]
+
+jobs:
+  phpcs:
+    name: PHPCS
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          lfs: false
+          persist-credentials: false
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: '8.2'
+          tools: cs2pr
+      - name: Install dependencies
+        run:
+          composer init --name=matomo/rebelmetrics --quiet;
+          composer --no-plugins config allow-plugins.dealerdirect/phpcodesniffer-composer-installer true -n;
+          composer config repositories.matomo-coding-standards vcs https://github.com/matomo-org/matomo-coding-standards -n;
+          composer require matomo-org/matomo-coding-standards:dev-master;
+          composer install --dev --prefer-dist --no-progress --no-suggest
+      - name: Check PHP code styles
+        id: phpcs
+        run: ./vendor/bin/phpcs --report-full --standard=tests/phpcs.xml --report-checkstyle=./phpcs-report.xml
+      - name: Show PHPCS results in PR
+        if: ${{ always() && steps.phpcs.outcome == 'failure' }}
+        run: cs2pr ./phpcs-report.xml --prepend-filename

.github/workflows/semgrep.yaml

@@ -6,8 +6,6 @@ on:
   workflow_dispatch: {}
   push:
     branches: ["main"]
-  schedule:
-    - cron: '05 07 * * *'
 
 jobs:
   semgrep:

tests/phpcs.xml

@@ -0,0 +1,33 @@
+<?xml version="1.0"?>
+<ruleset name="rebelMetrics" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="vendor/squizlabs/php_codesniffer/phpcs.xsd">
+
+    <description>Matomo coding standard</description>
+
+    <arg name="extensions" value="php" />
+
+    <file>.</file>
+
+    <exclude-pattern>*/vendor/*</exclude-pattern>
+
+    <rule ref="Matomo"></rule>
+
+    <rule ref="Generic.Files.LineLength">
+        <properties>
+            <property name="lineLimit" value="250" />
+        </properties>
+        <exclude-pattern>tests/*</exclude-pattern>
+    </rule>
+
+    <rule ref="Squiz.Classes.ValidClassName.NotCamelCaps">
+    </rule>
+
+    <rule ref="PSR1.Methods.CamelCapsMethodName.NotCamelCaps">
+        <!-- Allow using method name without camel caps in tests as long as some methods are named test_* -->
+        <exclude-pattern>tests/*</exclude-pattern>
+    </rule>
+
+    <rule ref="PSR1.Classes.ClassDeclaration.MultipleClasses">
+        <!-- Allow using multiple classes in one file for tests -->
+        <exclude-pattern>tests/*</exclude-pattern>
+    </rule>
+</ruleset>