Php 8.2 verification (#12)

- Added PHP 8.2 tests
- Added check for available cipher-methods of OpenSSL.
- Minor code optimizations

Author: JanSlabon

.github/workflows/tests.yml

@@ -29,7 +29,7 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        php: ['7.3', '7.4', '8.0', '8.1']
+        php: ['7.3', '7.4', '8.0', '8.1', '8.2']
     steps:
       - name: Checkout
         uses: actions/checkout@v2
@@ -43,7 +43,7 @@ jobs:
           php-version: "${{ matrix.php }}"
 
       - name: Upgrade phpunit
-        run: composer require --dev --with-all-dependencies "phpunit/phpunit=^9.0"
+        run: composer require --dev --no-interaction --no-update "phpunit/phpunit:^9.0"
 
       - name: Install dependencies
         run: composer update --dev --no-interaction --prefer-dist --no-progress --no-suggest --ansi

composer.json

@@ -17,10 +17,10 @@
         }
     },
     "require": {
-        "php": "^5.6 || ^7.0 || ^8.0",
+        "php": "^5.6 || ^7.0 || ^8.0 || ^8.1 || ^8.2",
         "ext-openssl": "*",
-        "setasign/fpdi": "^2.0",
-        "setasign/fpdf": "^1.8.4"
+        "setasign/fpdi": "^2.3.6",
+        "setasign/fpdf": "^1.8.5"
     },
     "authors": [
         {