Running Travis after_script only once

.travis.template.yml

# This is a workaround for running Travis after_script only once in a matrix, it has one fault, 
# if your chosen build was successful and the others don't, it will run anyway, there are more
# complete solutions available, but here is a simple one.

language: php

php:
  - 5.4
  - 5.5
  - 5.6

# Prepare your environment
before_script: ~

# Run your build
script: ~

# I want to echo "Uhul" only when my build is successful at PHP 5.6, and it's only once in a matrix
after_script: >
  if [ $(phpenv version-name) = '5.6' ]; then
  echo Uhul
  ; fi

.travis.yml

# My real case scenario with Symfony 2 and Code Climate sending messages to Gitter
language: php

php:
  - 5.4
  - 5.5
  - 5.6

env:
  global:
    - SYMFONY_ENV=test

services:
  - mongodb

before_script:
  - echo "version $(phpenv version-name)"
  - npm install -g bower
  - ln -s $(which bower) bin/bower
  - echo "extension = mongo.so" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini
  - composer self-update
  - composer install --optimize-autoloader --prefer-source
  - php app/console --env=test doctrine:mongodb:schema:create --index
  - php app/console --env=test doctrine:mongodb:fixtures:load --append

script: phpunit --verbose --repeat=3 -c app/phpunitTravis.xml

after_script: >
  if [ $(phpenv version-name) = '5.6' ]; then
  bin/test-reporter
  && curl -d message="[CodeClimate]($CODECLIMATE_URL) updated" $CODECLIMATE_GITTER_URL
  || curl -d message="CodeClimate failed to update" -d level=error $CODECLIMATE_GITTER_URL
  ; fi

notifications:
  webhooks:
    urls:
      - https://webhooks.gitter.im/e/token
    on_success: always
    on_failure: always