I'm searching for the activation location of my PHP extension in my PHP Docker container

When I check the activated extensions in my php Docker container, the output lists several PHP modules, such as Core, ctype, curl, and others.

the extensions appears to be deactivated In the php.ini file for example ;extension=curl, and when I try to activate it (), I encounter the following error

PHP Warning: PHP Startup: Unable to load dynamic library 'curl' (tried: /usr/local/lib/php/extensions/no-debug-non-zts-20210902/curl (/usr/local/lib/php/extensions/no-debug-non-zts-20210902/curl: cannot open shared object file: No such file or directory)

I'm just trying to figure out where this activation is happening.

am using php:8.1.25-apache-bullseye

I understand that you try to use "curl" functions inside php scripts

You need to add "curl" into the docker-php-ext-install instruction. From your Dockerfile

FROM php:8.1.25-apache-bullseye
WORKDIR /var/www/t3coredev

## Install system dependencies
RUN apt-get update \
    && apt-get install -y \
    libxml2-dev \
    libzip-dev \
    zlib1g-dev \
    libfreetype6-dev \
    libjpeg62-turbo-dev \
    libpng-dev \
    libjpeg-dev \
    libltdl-dev \
    libicu-dev \
    libmemcached-dev \
    libssl-dev \
    libonig-dev \
    iputils-ping \
    vim \
    wget \
    curl \
    git \
    build-essential \
    libcurl4 \
    libcurl4-openssl-dev \
    && rm -rf /var/lib/apt/lists/*

# Install Composer manually
RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer

## Install PHP extensions
RUN docker-php-ext-configure gd \
    --with-freetype=/usr/include/ \
    --with-jpeg=/usr/include/ \
    && docker-php-ext-install \
    pdo \
    session \
    filter \
    mbstring \
    intl \
    fileinfo \
    gd \
    zip \
    xml \
    dom \
    curl \
    pdo_mysql

## install ImageMagick https://www.linuxcapable.com/how-to-install-imagemagick-on-debian-linux/
#RUN git clone https://github.com/ImageMagick/ImageMagick.git /usr/local/src/ImageMagick \
#    cd /usr/local/src/ImageMagick \
#    ./configure \
#    make \
#    make install \
#    sudo ldconfig /usr/local/lib

RUN a2enmod alias \
    && a2enmod authz_core \
    && a2enmod deflate \
    && a2enmod expires \
    && a2enmod filter \
    && a2enmod headers \
    && a2enmod rewrite \
    && a2enmod setenvif

Once done, you should be able to run

docker build . -t myimagetag

Then to test if curl is enabled

docker run myimagetag php -r 'echo curl_exec(curl_init("https://dog.ceo/api/breeds/image/random"));'

That test curl for the php CLI usage