Merge pull request #3 from php-cache/hhvm

Fix for HHVM

Author: Nyholm

.travis.yml

@@ -46,7 +46,7 @@ before_script:
   - mongod --version
   - if [[ $TRAVIS_PHP_VERSION != 'hhvm' ]]; then pecl install -f mongodb-1.1.2; fi;
   - mongo --eval 'tojson(db.runCommand({buildInfo:1}))'
-  - php --ri mongodb
+  - if [[ $TRAVIS_PHP_VERSION != 'hhvm' ]]; then php --ri mongodb; fi;
   - travis_retry composer install --prefer-source --no-interaction
   - travis_retry composer self-update