添加扩展的dockerfile:

FROM php:5.6-fpm

ENV TZ=Asia/Shanghai

RUN set -xe

# "构建依赖"

    && buildDeps="

        git

        build-essential

        php5-dev

        php5-mysql

php5-xmlrpc

libxml2

libxml2-dev

        libfreetype6-dev

        libjpeg62-turbo-dev

        libmcrypt-dev

        libpng12-dev

        libpcre3-dev

    "

# "安装 php 以及编译构建组件所需包"

    && groupadd www

    && useradd -s /sbin/nologin -g www www

    && apt-get update

    && apt-get install -y ${buildDeps} --no-install-recommends

   && pecl install memcached

# "编译安装 php 组件"

    && docker-php-ext-install iconv mcrypt mysqli pdo pdo_mysql zip soap sockets xmlrpc

    && docker-php-ext-configure gd --with-freetype-dir=/usr/include/ --with-jpeg-dir=/usr/include/

    && docker-php-ext-install gd

  # 编译、安装 phalcon

   && git clone --depth=1 git://github.com/phalcon/cphalcon.git  

   && cd /usr/local/cphalcon/build

    && ./install

    && cd ../..

    && rm -rf cphalcon

    && docker-php-ext-enable phalcon soap sockets xmlrpc

   && ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone

#    && docker-php-ext-enable phalcon soap sockets xmlrpc

# "清理"

#    && apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false -o APT::AutoRemove::SuggestsImportant=false $buildDeps

#    && rm -rf /var/cache/apt/*

#    && rm -rf /var/lib/apt/lists/*