cli switch to ignore a certain extension

Description

when running php on the CLI its sometimes usefull to use the default config, but ignore only certain extensions.
(e.g. because these extension bring a perf hit when loaded, like blackfire or xdebug)

atm its quite some work to invoke PHP via cli, with all the default settings but just a single extension not loaded.
see e.g. composer/xdebug-handler which needs a lot of code to just make the use-case work for xdebug alone. I would need a similar thing for blackfire (and maybe another one for tideways).

I manually tried using php -n -dextension= ..<all loaded extensions here except xdebug> but this does not work.
(I think I would need to replicate most of the logic in composer/xdebug-handler)

would this problem be more easily solved with a new cli option at php-src level, which would allow to use the default but disable certain given extensions?

issue にはファイルやテストの名前が挙げられていません。まず、PHP CLI のオプション処理と、-dextension と併用した場合の -n の動作を追跡してください。名前付きの拡張機能を除外しながらデフォルト設定を維持する方法を確認し、その後、maintainer とオプションのスコープおよび完了条件を定義してください。