update workflow

Author: Mokhtar Tlili

.github/workflows/php.yml

@@ -1,4 +1,4 @@
-name: PHP Composer
+name: Testing
 
 on:
   push:
@@ -12,11 +12,22 @@ permissions:
 jobs:
   build:
 
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ ubuntu-latest, macos-latest, windows-latest ]
+        php: [ '7.4', '8.0', '8.1' ]
 
     steps:
     - uses: actions/checkout@v3
 
+    - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          tools: composer
+          coverage: pcov
+
     - name: Validate composer.json and composer.lock
       run: composer validate --strict