My system is:

• Windows 11 Pro
• Xampp
• PHP 8.2.12
• xdebug v3.5.1

I define the binary in my php.ini as

zend_extension = "D:\websites\php\ext\php_xdebug-3.5.1-8.2-ts-vs16-x86_64.dll"

Everything is working as expected, however I ran the install wizard (https://xdebug.org/wizard) and it said everything was configured except that I should add zend_extension = xdebug to my php.ini

https://xdebug.org/docs/install

If you want to use Xdebug and OPCache together, you must have the zend_extension line for Xdebug below the line for OPCache, or in a file starting with a higher number (ie. 99-xdebug.ini vs 20-opcache.ini), otherwise they won't work properly together.

If everything is working, why do I need to add this? Does it serve a purpose for me? What does it do?

解决方案

You don't need to add zend_extension = xdebug, if your current full path line is already working.

In PHP, extensions come in two types

1. extension = ... -> 常规PHP扩展
2. zend_extension = ... -> Zend引擎扩展（对PHP引擎的底层钩子）

Xdebug is a Zend extension, so it must be loaded using zend_extension, not extension.

What you have is correct. According to the doc, Xdebug must be loaded after OPCache. So make sure this is in order

zend_extension=opcache
zend_extension="D:\...\php_xdebug.dll"

Why does the wizard suggest it

The Xdebug Installation Wizard gives generic advice, assuming you might install via package manager or PHP already knows where Xdebug is located

So it suggests zend_extension = xdebug

That only works if The DLL/SO is in PHP's default extension directory and PHP can resolve it automatically