Fix PHP 8.2 deprecation warnings

Author: const-cloudinary

.github/workflows/test.yaml

@@ -0,0 +1,29 @@
+name: Tests
+on: [push, pull_request]
+jobs:
+  php:
+    name: PHP ${{ matrix.php-versions }}
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        php-versions:
+          - '5.6'
+          - '7.4'
+          - '8.0'
+          - '8.1'
+          - '8.2'
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Setup PHP, with composer and extensions
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-versions }}
+          extensions: json
+          coverage: xdebug
+      - name: Install Composer dependencies
+        run: composer update -n
+      - name: Run Tests
+        run: |
+          vendor/bin/simple-phpunit

.travis.yml

@@ -96,7 +96,7 @@ class PVar extends Expression
     public function __construct($name)
     {
         if (empty($name) || ! self::isPredefinedVariable($name)) {
-            throw new InvalidArgumentException("Invalid predefined variable name: '${name}'");
+            throw new InvalidArgumentException("Invalid predefined variable name: '{$name}'");
         }
 
         parent::__construct($name);