Update php.yml

.github/workflows/php.yml

@@ -4,11 +4,22 @@ on: [push]
 
 jobs:
   build:
-
-    runs-on: ubuntu-latest
+        
+    runs-on: ${{ matrix.operating-system }}
+    strategy:      
+      matrix:
+        operating-system: [ubuntu-latest]
+        php-versions: ['7.2', '7.3', '7.4']
+    name: PHP ${{ matrix.php-versions }} Test on ${{ matrix.operating-system }}    
 
     steps:
     - uses: actions/checkout@v1
+      
+    - name: Setup PHP Action
+      uses: shivammathur/setup-php@1.6.1
+      with:
+        php-version: ${{ matrix.php-versions }}
+        extensions: mbstring, intl, gd 
 
     - name: Validate composer.json and composer.lock
       run: composer validate