Update composer.json to allow PHP 8 (#24)

* Update composer.json to allow PHP 8

* Update php.yml

Co-authored-by: Martin Helmich <kontakt@martin-helmich.de>

Author: sanmai

.github/workflows/php.yml

@@ -14,11 +14,20 @@ jobs:
       matrix:
         php: ['7.2', '7.3', '7.4']
         phpunit: ['8.0', '9.0']
+        composer-arg: ['']
+        include:
+          - php: '8.0'
+            phpunit: '9.0'
+            composer-arg: 'ignore-platform-req=php'
         exclude:
+          - php: '8.0'
+            phpunit: '8.0'
           - php: '7.2'
             phpunit: '9.0'
     runs-on: ubuntu-latest
-
+    continue-on-error: ${{ matrix.php == '8.0' }}
+    name: PHP ${{ matrix.php }}, PHPUnit ${{ matrix.phpunit }}
+    
     steps:
     - uses: actions/checkout@v1
 
@@ -28,7 +37,7 @@ jobs:
         php-version: ${{ matrix.php }}
         extensions: mbstring, intl, json
         coverage: pcov
-    
+        tools: composer:v2
     - name: Validate composer.json and composer.lock
       run: composer validate
 
@@ -37,7 +46,7 @@ jobs:
         composer require --no-update --dev phpunit/phpunit ~${{ matrix.phpunit }}
 
     - name: Install dependencies
-      run: composer install --prefer-dist --no-progress --no-suggest
+      run: composer install --prefer-dist --no-progress --no-suggest --${{ matrix.composer-arg }}
 
     #- name: Run type checker
     #  run: ./vendor/bin/psalm

composer.json

@@ -9,7 +9,7 @@
         }
     ],
     "require": {
-        "php": "^7.2",
+        "php": "^7.2 || ^8.0",
         "flow/jsonpath": "^0.5.0",
         "justinrainbow/json-schema": "^5.0"
     },
@@ -32,4 +32,4 @@
     "config": {
         "sort-packages": true
     }
-}
+}