Dockerfile

# Use ARG to accept PHP version from docker-compose
ARG PHP_VERSION=7.4
FROM php:${PHP_VERSION}-cli

# Install system dependencies
RUN apt-get update && apt-get install -y \
    git \
    unzip

# Install PHP extensions pcntl
RUN docker-php-ext-install pcntl

# Install Xdebug based on PHP version
RUN PHP_VERSION=$(php -r 'echo PHP_VERSION;') && \
    if [ "$(printf '%s\n' "8.0.0" "$PHP_VERSION" | sort -V | head -n1)" = "8.0.0" ]; then \
        pecl install xdebug && docker-php-ext-enable xdebug; \
    else \
        pecl install xdebug-3.1.5 && docker-php-ext-enable xdebug; \
    fi

# Enable Xdebug coverage
ENV XDEBUG_MODE=coverage

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

# Set working directory
WORKDIR /var/www/html

# Copy project files
COPY . .

# Install PHP dependencies
RUN composer install