I tried to install xdebug in windows 10. There is no zend_extension in php.ini file. I followed this way:
Download php_xdebug-2.9.5-7.3-vc15-x86_64.dll
Move the downloaded file to
Edit C:\xampp\php\php.ini and add the line.
but I couldn't find zend_extension .
You are adding that line so it won't exist yet.
Your php.ini file should have this added to it:
Make sure you put that DLL in the ext directory as well.
(I guessed at the path to the PHP extension directory as I do not use xampp.)