feature #134 Add support for PHP 8 (dunglas)

This PR was merged into the 2.2-dev branch.

Discussion
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Commits
-------

f6121b8367 Add support for PHP 8
8e736edf2c remove Symfony 5.0 from the matrix because it isn't maintained anymore
7bd72b4cfa make Travis happy
494affd2d9 Try to fix the build
9d7a615ebd cleanup

.travis.yml

@@ -4,10 +4,10 @@ php:
   - '7.2'
   - '7.3'
   - '7.4'
+  - '8.0snapshot'
 
 env:
     - SYMFONY_VERSION=4.4.*
-    - SYMFONY_VERSION=5.0.*
     - SYMFONY_VERSION=5.1.*
 
 cache:
@@ -16,6 +16,7 @@ cache:
 
 before_install:
     - phpenv config-rm xdebug.ini || true
+    - composer self-update --2 # Upgrade to Compose 2 (needed for PHP 8 support), only needed while it's not installed by default
 
 install:
     - composer require symfony/dependency-injection:${SYMFONY_VERSION} --no-update --no-scripts --prefer-dist
@@ -27,7 +28,8 @@ install:
     - composer require --dev symfony/process:${SYMFONY_VERSION} --no-update --no-scripts --prefer-dist
     - composer require --dev symfony/yaml:${SYMFONY_VERSION} --no-update --no-scripts --prefer-dist
 
-    - composer update --prefer-dist
+    # ignore-platform-req=php is necessary temporarily because PageObjectExtension isn't compatible with PHP8 yet: https://github.com/FriendsOfBehat/PageObjectExtension/pull/16
+    - if [[ ${TRAVIS_PHP_VERSION:0:3} == "8.0" ]]; then composer update --prefer-dist --ignore-platform-req=php; else composer update --prefer-dist; fi
 
 script:
     - composer check

composer.json

@@ -11,7 +11,7 @@
         }
     ],
     "require": {
-        "php": "^7.2",
+        "php": "^7.2|^8.0",
         "behat/behat": "^3.6.1",
         "symfony/dependency-injection": "^4.4|^5.0",
         "symfony/http-kernel": "^4.4|^5.0",