I want to upgrade my PHPUnit docker image from XDebug 2.9 to 3.0 because I want to use PHP8.

This is the code of my Dockerfile:

FROM php:8.0-fpm-alpine

install dependencies
RUN set -ex; \

apk add --no-cache --virtual \

.build-deps \

$PHPIZE_DEPS \

bash
use the mlocati/docker-php-extension-installer to install necessary packages and php extensions
the installer cleans up all dev packages which were only used for compiling
COPY --from=mlocati/php-extension-installer /usr/bin/install-php-extensions /usr/local/bin/

RUN chmod uga+x /usr/local/bin/install-php-extensions && \

sync && \

install-php-extensions \

xdebug
install composer (needed for PHPUnit updates)
RUN set -ex; \

curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer
modify xdebug.ini to reflect php version (replaced by the 'docker-php-ext-enable imagick' command, but still
a pretty nice command to my mind)
COPY xdebug.ini /usr/local/etc/php/conf.d/docker-php-ext-xdebug.ini

RUN set -ex; \

find /usr/local/lib/php/extensions -name "no-debug-non-zts-*" | \

xargs basename | \

xargs -I '{}' sed -i 's/{folder_version}/{}/g' /usr/local/etc/php/conf.d/docker-php-ext-xdebug.ini
VOLUME /var/www/html

WORKDIR /var/www/html
CMD php-fpm

Whenever I enable XDebug a lot of "default" options are set even if they don't appear in any .ini file.

Version => 3.0.1

Support Xdebug on Patreon, GitHub, or as a business: https://xdebug.org/support

Directive => Local Value => Master Value

xdebug.auto_trace => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.auto_trace" => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.auto_trace"

xdebug.collect_includes => This setting has been removed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#removed-"xdebug.collect_includes" => This setting has been removed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#removed-"xdebug.collect_includes"

xdebug.collect_params => This setting has been removed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#removed-"xdebug.collect_params" => This setting has been removed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#removed-"xdebug.collect_params"
...

This is the code of my xdebug.ini

[xdebug]

; enable the extension

zend_extension=/usr/local/lib/php/extensions/{folder_version}/xdebug.so

; do NOT use the incoming IP address to connect back

xdebug.remote_connect_back=0

; use DNS entry to resolve the host instead

; @see https://docs.docker.com/docker-for-windows/networking/#i-cannot-ping-my-containers

xdebug.remote_host=10.254.254.254

; use port 9000 on the remote host for connection

xdebug.remote_port=9002

; enable debugging

xdebug.default_enable=0

xdebug.remote_enable=1

xdebug.remote_autostart=0

xdebug.idekey=PHPSTORM
; save detailed information in a log file

; only required when setting up xdebug

xdebug.remote_log="/tmp/xdebug.log"

I have no idea where these options come from and if they are blocking anything. They appear as soon as the extension is loaded.