add syntax checker workflow

Author: wing328

.github/workflows/samples-php-client.yaml

@@ -4,11 +4,9 @@ on:
   push:
     paths:
       - samples/client/petstore/php/OpenAPIClient-php/**
-      - samples/client/petstore/php-nextgen/OpenAPIClient-php/**
   pull_request:
     paths:
       - samples/client/petstore/php/OpenAPIClient-php/**
-      - samples/client/petstore/php-nextgen/OpenAPIClient-php/**
 jobs:
   build:
     name: Build PHP projects
@@ -24,7 +22,6 @@ jobs:
         sample:
           # clients
           - samples/client/petstore/php/OpenAPIClient-php/
-          - samples/client/petstore/php-nextgen/OpenAPIClient-php/
     services:
       petstore-api:
         image: swaggerapi/petstore

.github/workflows/samples-php-syntax-check.yaml

@@ -0,0 +1,36 @@
+name: Samples PHP Syntax Checker
+
+on:
+  push:
+    paths:
+      - samples/client/petstore/php/OpenAPIClient-php/**
+      - samples/client/petstore/php-nextgen/OpenAPIClient-php/**
+  pull_request:
+    paths:
+      - samples/client/petstore/php/OpenAPIClient-php/**
+      - samples/client/petstore/php-nextgen/OpenAPIClient-php/**
+jobs:
+  build:
+    name: Build PHP projects
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        php:
+          - "8.1"
+          - "8.2"
+          - "8.3"
+          - "8.4"
+        sample:
+          # clients
+          - samples/client/petstore/php/OpenAPIClient-php/
+          - samples/client/petstore/php-nextgen/OpenAPIClient-php/
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup PHP with tools
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: "${{ matrix.php }}"
+      - name: php -l
+        working-directory: ${{ matrix.sample }}
+        run: find . -name "*.php" -exec php -l {} +