How to setup xdebug

At the end of /etc/php5/apache2/php.ini file set the following:

[xdebug]
zend_extension = <path to xdebug.so>

xdebug.idekey = "netbeans-xdebug" 

xdebug.remote_enable = on
xdebug.remote_host = localhost
xdebug.remote_port = 9000
xdebug.remote_handler = dbgp
xdebug.remote_mode = req
xdebug.remote_cookie_expire_time = 7200

xdebug.profiler_enable = off
xdebug.profiler_output_dir = /tmp
xdebug.profiler_output_name = cachegrind.out.%p-%H-%R
xdebug.profiler_enable_trigger = off

This can (without [xdebug]) be set in

/etc/php5/apache2/conf.d/20-xdebug.ini

or

/etc/php/7.0/apach2/conf.d/20-xdebug.ini

and restart Apache2 server:

sudo /etc/init.d/apache2 restart