try installing latest PHP version to avoid segfaults while running te…

…sts with PHP 8

.travis.yml

@@ -11,7 +11,8 @@ jobs:
       php: 7.3
       env: DEPS='lowest' WITH_DOCTRINE_CACHE_BUNDLE='yes' SYMFONY_DEPRECATIONS_HELPER='max[self]=2&max[direct]=168&max[indirect]=871'
     -
-      php: 8.0
+      php: 8.0 # 8.0.2
+#      php: nightly # 8.0.3-dev
       dist: focal
       env: DEPS='unmodified' WITH_STATIC_ANALYSIS='yes'
 
@@ -35,6 +36,18 @@ jobs:
     - env: SYMFONY_VERSION='5.4.*' MIN_STABILITY='dev'
   fast_finish: true
 
+before_install:
+  # install a custom PHP version
+  - echo ${TRAVIS_PHP_VERSION}
+  - |
+    if [ "${TRAVIS_DIST}" = "focal" ]; then
+      sudo apt update
+      sudo apt install ca-certificates apt-transport-https software-properties-common
+      sudo add-apt-repository -y ppa:ondrej/php
+      sudo apt install -y php8.0 libapache2-mod-php8.0
+      php -v
+    fi
+
 install:
   # set unlimited memory_limit
   - INI_FILE=~/.phpenv/versions/$(phpenv version-name)/etc/conf.d/travis.ini