commands_to_install_additional_php_ext

Thanks: https://github.com/docker-library/php/issues/75

LDAP: apt-get install -y libldap2-dev && docker-php-ext-configure ldap --with-libdir=lib/x86_64-linux-gnu/ && docker-php-ext-install ldap
SOAP: apt-get install -y libxml2-dev && docker-php-ext-install soap (Need to be checked)
FTP: apt-get install -y libssl-dev && docker-php-ext-install ftp (Need to be checked)
intl: apt-get install -y libicu-dev && docker-php-ext-install intl (Need to be checked)
xsl: apt-get install -y libxslt-dev && docker-php-ext-install xsl (Need to be checked)
imap: apt-get install -y libc-client-dev libkrb5-dev && docker-php-ext-configure imap --with-kerberos --with-imap-ssl && docker-php-ext-install imap (Need to be checked)
mssql & pdo_dblib: apt-get install -y freetds-dev && ln -s /usr/lib/x86_64-linux-gnu/libsybdb.so /usr/lib/libsybdb.so
                   docker-php-ext-configure mssql --with-mssql=/usr && docker-php-ext-install mssql
                   docker-php-ext-configure pdo_dblib --with-pdo-dblib=/usr && docker-php-ext-install pdo_dblib
                   COPY docker/docker-config/freetds.conf /etc/freetds/freetds.conf
                   new \PDO('dblib:host=mssqlserver;dbname=DBNAME', 'USERNAME', 'PASSWORD');