Fixing ‘Call to undefined function imagecreatefromjpeg()’ error in PHP Docker container by importing PHP GD extension

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If we are using image processing functions in PHP, we need to install and enable PHP GD in the Docker container.

To do this, we go to our Dockerfile and add the following:

# syntax=docker/dockerfile:1
FROM php:7.2.5-apache
RUN docker-php-ext-install mysqli

RUN docker-php-ext-install pdo_mysql

RUN apt-get update && \
    apt-get install -y libfreetype6-dev libjpeg62-turbo-dev libpng-dev && \
    docker-php-ext-configure gd --with-freetype-dir=/usr/include/ --with-jpeg-dir=/usr/include/ && \
    docker-php-ext-install -j$(nproc) gd

RUN apt-get install -y libjpeg-dev && \
    docker-php-ext-configure gd --with-jpeg-dir=/usr/include/ && \
    docker-php-ext-install -j$(nproc) gd

#Activate Apache modules:
RUN a2enmod headers
RUN a2enmod rewrite
RUN a2enmod ssl

RUN /etc/init.d/apache2 restart
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