sudo subl /etc/php/7.1/cli/php.ini
sudo subl /etc/php/7.1/fpm/php.ini


[Xdebug]
xdebug.remote_autostart=on
xdebug.remote_enable=on
xdebug.remote_handler="dbgp"
xdebug.remote_host="localhost"
xdebug.remote_port=9000
xdebug.remote_mode=req
xdebug.idekey="PHPSTORM"
xdebug.overload_var_dump=off

Prepare to install:

apt install php7.0-xdebug
php --version

Find xdebug path (latest by year):

find / -name 'xdebug.so' 2> /dev/null

Config update vi /etc/php/7.0/fpm/php.ini:

zend_extension="/usr/lib/php/20160303/xdebug.so"
xdebug.remote_autostart=on
xdebug.remote_enable=on
xdebug.remote_handler="dbgp"
xdebug.remote_host="localhost"
xdebug.remote_port=9000
xdebug.remote_mode=req
xdebug.overload_var_dump=off
xdebug.idekey = PHPSTORM
xdebug.max_nesting_level = 512
xdebug.file_link_format = phpstorm://open?%f:%l

Then restart:

service php7.0-fpm restart