updated dockerfile

Dockerfile

-FROM php:7.3-apache
+FROM php:7.4-apache
 
 # Update system
-RUN apt-get update
+RUN apt-get update && rm /etc/apt/preferences.d/no-debian-php && apt-get install --yes git libzip-dev zip
+
+# Install nodejs & npm
+RUN curl -sL https://deb.nodesource.com/setup_15.x | bash - \
+   && apt-get install -y nodejs
+
+# Install compass
+RUN apt-get install -y ruby-full \
+    && gem install compass
+
+# Install webpack
+RUN npm install --global webpack webpack-cli
 
 # Install composer
 ENV COMPOSER_HOME "/home/www-data/.composer"
@@ -9,8 +20,10 @@ RUN mkdir -p $COMPOSER_HOME && chmod -R 777 $COMPOSER_HOME && curl -sS https://g
   && chmod +x composer.phar && mv composer.phar /usr/local/bin/composer
 
 RUN mkdir /srv/app
-COPY vhost.conf /etc/apache2/sites-available/000-default.conf
+COPY .docker/vhost.conf /etc/apache2/sites-available/000-default.conf
 
-RUN docker-php-ext-install pdo pdo_mysql bcmath && \
+RUN pecl install xdebug-2.9.2 && \
+ docker-php-ext-enable xdebug && \
+ docker-php-ext-install pdo pdo_mysql bcmath && \
  chown -R www-data:www-data /srv/app && \
  a2enmod rewrite

interface-initiale/index.php

@@ -5,12 +5,14 @@ session_start();
 $pdo = new \PDO('mysql:host=mysql_todo_1;port=3306;dbname=todos;charset=utf8;', 'todos-user', 'todos-pwd');
 
 if (isset($_GET['logout'])) {
-    $_SESSION['user_id'] = null;
+    if (array_key_exists('user_id', $_SESSION)) {
+        $_SESSION['user_id'] = null;
+    }
 }
 
 function estConnecte()
 {
-    return $_SESSION['user_id'] != null;
+    return array_key_exists('user_id', $_SESSION) && $_SESSION['user_id'] != null;
 }
 
 $erreurConnexion = null;