pdo driver missing docker code example

Example 1: install php pdo mysql PHP5.6 alpine-apache

FROM php:5.6-apache

RUN docker-php-ext-install pdo pdo_mysql
COPY my-php-files/ /var/www/html/

Example 2: install php pdo mysql PHP5.6 alpine-apache

docker exec -it <container ID> docker-php-ext-install pdo pdo_mysql