WILT: Yii and Memcached

Struggling to get Memcached working with Yii framework in PHP. Reading all the documents the config was saying 'yii.caching.MemCached'. Finally I found Tips for using Memcache in the YII framework that just had the cache main name rather than the full namespaced path. Also got the Dockerfile altered to install and activate Memcached

1'cache' => ['class' => 'CMemCache','useMemcached' => true,'servers' => [['host' => 'memcached','port' => 11211,'weight' => 100]]],
1RUN apt-get update \
2    && apt-get install -y libmemcached-dev \
3    && pecl install memcached \
4    && docker-php-ext-enable memcached