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add-apt-repository ppa:ondrej/php
apt update
apt install php5.6 libapache2-mod-php5.6 php5.6-curl php5.6-gd php5.6-mbstring php5.6-mcrypt php5.6-mysql php5.6-xml php5.6-xmlrpc
a2dismod php7.0
a2enmod php5.6
systemctl restart apache2