Settings to copy to your php.ini to make debugger work. It lists many unnecessary values just in case they were overridden before.

php.ini

; path to your php_xdebug extension file
; download from https://xdebug.org/wizard.php
zend_extension="c:\xampp-php7\php\ext\php_xdebug-2.4.0-7.0-vc14.dll"
; disables profiler globally 
xdebug.profiler_enable = 0
; allows enabling it selectively with request parameter "XDEBUG_PROFILE"
xdebug.profiler_enable_trigger = 1
; directory to output profiler files to
xdebug.profiler_output_dir = "C:\xampp-php7\tmp"
; profiler file name (with request uri and timestamp)
xdebug.profiler_output_name = "%R-%t.cgout"
; enables debugger
xdebug.remote_enable = 1
; selects the dbgp protocol
xdebug.remote_handler = "dbgp"
; host where debug client is running
xdebug.remote_host = "localhost"
; debugger port
xdebug.remote_port = 9000
; disables xdebug traces in error messages - use https://tracy.nette.org/ instead
xdebug.default_enable = "Off"
; makes sure that the process does not freeze when there is no debug client
xdebug.remote_autostart = 0