disable Xdebug while running Composer

.travis.yml

@@ -32,15 +32,23 @@ matrix:
   fast_finish: true
 
 install:
+  # set unlimited memory_limit
   - if [ "${TRAVIS_PHP_VERSION}" != 'hhvm' ]; then INI_FILE=~/.phpenv/versions/$(phpenv version-name)/etc/conf.d/travis.ini; else INI_FILE=/etc/hhvm/php.ini; fi;
   - echo "memory_limit = -1" >> "${INI_FILE}"
+  # disable Xdebug for better Composer performance
+  - if [ "${TRAVIS_PHP_VERSION}" != 'hhvm' ]; then mv ~/.phpenv/versions/$(phpenv version-name)/etc/conf.d/xdebug.ini xdebug.ini; fi;
+  # install dependencies using Composer
   - bash .travis_install_dependencies.sh
 
 before_script:
   - mkdir -p build/logs
 
 script:
+  # enable Xdebug for code coverage analysis
+  - if [ "${TRAVIS_PHP_VERSION}" != 'hhvm' ]; then mv xdebug.ini ~/.phpenv/versions/$(phpenv version-name)/etc/conf.d/xdebug.ini; fi;
+  # run PHPUnit
   - vendor/bin/phpunit -v --coverage-clover build/logs/clover.xml
+  # upload code coverage data
   - if [ "${TRAVIS_PHP_VERSION}" != 'hhvm' ]; then travis_retry wget -q https://github.com/satooshi/php-coveralls/releases/download/v1.0.1/coveralls.phar && travis_retry php coveralls.phar -v; fi;
 
 notifications: