Adding PHP8 support to v5 using @szepeviktor fix

Author: nyamsprod

.travis.yml

@@ -44,9 +44,14 @@ matrix:
         - php: nightly
           env:
               - COLLECT_COVERAGE=false
-              - COMPOSER_ARGS="--no-interaction --no-suggest --prefer-source --ignore-platform-reqs"
+              - COMPOSER_ARGS="--no-interaction --no-suggest --prefer-source"
               - RUN_PHPSTAN=false
               - VALIDATE_CODING_STYLE=false
+          install:
+              - composer remove --no-interaction --no-update --dev "friendsofphp/php-cs-fixer"
+              - travis_retry composer require $COMPOSER_ARGS --no-update --dev "composer/composer:2.0.x-dev"
+              - travis_retry composer require $COMPOSER_ARGS --no-update --dev "phpunit/phpunit:^9.3.11"
+              - travis_retry composer update $COMPOSER_ARGS
     allow_failures:
         - php: nightly
     fast_finish: true

composer.json

@@ -43,9 +43,9 @@
         "psl"
     ],
     "require": {
-        "php": "^7.2.5",
         "ext-intl": "*",
         "ext-json": "*",
+        "php": "^7.2.5 || ^8.0",
         "psr/log": "^1.1",
         "psr/simple-cache": "^1.0.1"
     },