Docker installed 5.5.9 instead of 5.6

[DonikaV]

Hi. I am just starting with docker and i have some troubles.
I want to install PHP 5.6.30

this is my config for php

FROM php:5.6.30-fpm

RUN apt-get update && apt-get install -y libmcrypt-dev libxml2-dev locate nano \
    && docker-php-ext-install mcrypt mbstring pdo pdo_mysql mysqli

RUN apt-get install -q -y php5-memcached
RUN apt-get install -q -y php5-gd

RUN apt-get update && apt-get install -y libmemcached-dev zlib1g-dev \
    && pecl install memcached-2.2.0 \
    && docker-php-ext-enable memcached

RUN apt-get install -y libfreetype6-dev libjpeg62-turbo-dev && \
    docker-php-ext-configure gd --with-freetype-dir=/usr/include/ --with-jpeg-dir=/usr/include/  &&  \
    docker-php-ext-install gd
 

RUN pecl install -o -f xdebug \
    && rm -rf /tmp/pear \
    && echo "zend_extension=/usr/local/lib/php/extensions/no-debug-non-zts-20121212/xdebug.so" > /usr/local/etc/php/conf.d/xdebug.ini

but php-v returned

Zend Engine v2.5.0, Copyright (c) 1998-2014 Zend Technologies
    with Zend OPcache v7.0.3, Copyright (c) 1999-2014, by Zend Technologies
root@df452ae965ea:/var/www/html# php -v
PHP 5.5.9-1ubuntu4.21 (cli) (built: Feb  9 2017 20:54:58) 
Copyright (c) 1997-2014 The PHP Group
Zend Engine v2.5.0, Copyright (c) 1998-2014 Zend Technologies
    with Zend OPcache v7.0.3, Copyright (c) 1999-2014, by Zend Technologies

What i am doing wrong?

[tianon]

When you install packages like "php5-memcached" from Debian, they pull in Debian's PHP package, which is where that 5.5 is coming from. Instead, you'll need to use one of "docker-php-ext-install", "pecl install", or manual download and compilation to get additional extensions.

[tianon]

See also #542, which blocks the installation of Debian's PHP packages outright in order to help avoid this very confusion. 👍