dnf remove php
dnf remove php-common
wget https://rpms.remirepo.net/fedora/remi-release-25.rpm
rpm -Uvh remi-release-25.rpm
dnf --enablerepo=remi install php56 php56-php-common php56-php-cli php56-php-mbstring php56-php-mcrypt php56-php-pear php56-php-xml php56-runtime php56-php-mysqlnd

# php -r "echo 'Current PHP version: ' . phpversion();"
-bash: /usr/bin/php: No such file or directory
# php56 -r "echo 'Current PHP version: ' . phpversion();"
Current PHP version: 5.6.30

cd /usr/bin
ln -s /opt/remi/php56/root/usr/bin/php php