diff --git a/conf/php-fpm.conf b/conf/php-fpm.conf
index 8c59dc8..b2769e7 100644
--- a/conf/php-fpm.conf
+++ b/conf/php-fpm.conf
@@ -249,3 +249,4 @@ php_value[max_input_time] = 600
 ;php_value[memory_limit] = 256M
 ;php_value[short_open_tag] = On
 
+env[COMPOSER_HOME]= /opt/YNH_WWW_APP_composer'
diff --git a/scripts/backup b/scripts/backup
index 6dc18a0..2bb0197 100644
--- a/scripts/backup
+++ b/scripts/backup
@@ -16,7 +16,7 @@ ynh_backup "/var/www/${app}" "sources"
 # Backup of composer
 #
 # TO BE VALIDATED AND TESTED
-ynh_backup "/opt/flarum_composer" "flarum_composer" 
+ynh_backup "/opt/${app}_composer" "flarum_composer" 
 
 ### MySQL ###
 # If a MySQL database is used:
diff --git a/scripts/install b/scripts/install
index c3f905d..52c46b7 100644
--- a/scripts/install
+++ b/scripts/install
@@ -81,23 +81,25 @@ sudo chown -R www-data:www-data $tmp
 sudo chmod -R 755 $tmp
 
 # Prepare composer and cache directories
-sudo mkdir -p /opt/flarum_composer/cache
-sudo chown -R www-data:www-data /opt/flarum_composer
-sudo chmod -R 755 /opt/flarum_composer
+compo=/opt/${app}_composer
+sudo mkdir -p $compo/cache
+sudo chown -R www-data:www-data $compo
+sudo chmod -R 755 $compo
 
 ### composer ###
-if ! type "composer" > /dev/null; then
+#if ! type "composer" > /dev/null; then
   # Install composer (https://getcomposer.org)
   EXPECTED_SIGNATURE=$(wget https://composer.github.io/installer.sig -O - -q)
-  sudo su - www-data -s /bin/bash -c "php -r \"copy('https://getcomposer.org/installer', '$tmp/composer-setup.php');\""
-  ACTUAL_SIGNATURE=$(php -r "echo hash_file('SHA384', '$tmp/composer-setup.php');")
+  sudo php -r "copy('https://getcomposer.org/installer', '$compo/composer-setup.php');"
+  ACTUAL_SIGNATURE=$(php -r "echo hash_file('SHA384', '$compo/composer-setup.php');")
   if [ "$EXPECTED_SIGNATURE" = "$ACTUAL_SIGNATURE" ]
   then
-      sudo su - root -c "grep -q -F 'env[COMPOSER_HOME]= /opt/flarum_composer' /etc/php5/fpm/pool.d/${app}.conf || sudo echo 'env[COMPOSER_HOME]= /opt/flarum_composer' >> /etc/php5/fpm/pool.d/${app}.conf"
-      sudo service php5-fpm reload
-      sudo su - www-data -s /bin/bash -c "php $tmp/composer-setup.php --install-dir=$tmp --filename=composer"
-      sudo mv $tmp/composer /usr/local/bin
-      sudo chown root:root /usr/local/bin/composer
+#      sudo grep -q -F 'env[COMPOSER_HOME]= $compo' /etc/php5/fpm/pool.d/${app}.conf || sudo echo 'env[COMPOSER_HOME]= /opt/flarum_c$
+#      sudo service php5-fpm reload
+#       echo "php reload"
+      sudo php $compo/composer-setup.php --install-dir=$compo --filename=composer
+#      sudo mv /opt/flarum_composer/composer /usr/local/bin
+#      sudo chown root:root /usr/local/bin/composer
       RESULT=$?
   else
       >&2 echo 'ERROR: Invalid installer signature'
@@ -105,10 +107,9 @@ if ! type "composer" > /dev/null; then
   fi
   if [ $RESULT != 0 ]
   then
-    sudo rm -rf $final_path
-    exit $RESULT
+    ynh_die
   fi
-fi
+#fi
 ### composer end ###
 
 ### Install flarum
diff --git a/scripts/remove b/scripts/remove
index 65b8504..e66c04a 100644
--- a/scripts/remove
+++ b/scripts/remove
@@ -6,22 +6,61 @@ app=$YNH_APP_INSTANCE_NAME
 # Source YunoHost helpers
 source /usr/share/yunohost/helpers
 
+SECURE_REMOVE () {      # Suppression de dossier avec vérification des variables
+	chaine="$1"	# L'argument doit être donné entre quotes simple '', pour éviter d'interpréter les variables.
+	no_var=0
+	while (echo "$chaine" | grep -q '\$')	# Boucle tant qu'il y a des $ dans la chaine
+	do
+		no_var=1
+		global_var=$(echo "$chaine" | cut -d '$' -f 2)	# Isole la première variable trouvée.
+		only_var=\$$(expr "$global_var" : '\([A-Za-z0-9_]*\)')	# Isole complètement la variable en ajoutant le $ au début et en gardant uniquement le nom de la variable. Se débarrasse surtout du / et d'un éventuel chemin derrière.
+		real_var=$(eval "echo ${only_var}")		# `eval "echo ${var}` permet d'interpréter une variable contenue dans une variable.
+		if test -z "$real_var" || [ "$real_var" = "/" ]; then
+			echo "Variable $only_var is empty, suppression of $chaine cancelled." >&2
+			return 1
+		fi
+		chaine=$(echo "$chaine" | sed "s@$only_var@$real_var@")	# remplace la variable par sa valeur dans la chaine.
+	done
+	if [ "$no_var" -eq 1 ]
+	then
+		if [ -e "$chaine" ]; then
+			echo "Delete directory $chaine"
+			sudo rm -r "$chaine"
+		fi
+		return 0
+	else
+		echo "No detected variable." >&2
+		return 1
+	fi
+}
+
+REMOVE_NGINX_CONF () {	# Suppression de la configuration nginx
+	if [ -e "/etc/nginx/conf.d/$domain.d/$app.conf" ]; then	# Delete nginx config
+		echo "Delete nginx config"
+		sudo rm "/etc/nginx/conf.d/$domain.d/$app.conf"
+	fi
+}
+
+REMOVE_FPM_CONF () {	# Suppression de la configuration du pool php-fpm
+	if [ -e "/etc/php5/fpm/pool.d/$app.conf" ]; then	# Delete fpm config
+		echo "Delete fpm config"
+		sudo rm "/etc/php5/fpm/pool.d/$app.conf"
+	fi
+}
+
 # Retrieve app settings
 domain=$(ynh_app_setting_get "$app" domain)
 
 # Remove sources
-sudo rm -rf /tmp/composerinstall
-sudo rm -rf /var/www/$app
-sudo rm -rf /opt/flarum_composer
+SECURE_REMOVE "/tmp/composerinstall"
+SECURE_REMOVE "/var/www/$app"
+SECURE_REMOVE "/opt/${app}_composer"
 
-# Remove nginx configuration file
-sudo rm -f /etc/nginx/conf.d/$domain.d/$app.conf
-
-### PHP ###
-# If a dedicated php-fpm process is used:
-sudo rm -f /etc/php5/fpm/pool.d/$app.conf
+# Remove nginx and PHP-FPM files and restart services
+REMOVE_NGINX_CONF
+REMOVE_FPM_CONF 
+sudo service nginx reload
 sudo service php5-fpm reload
-### PHP end ###
 
 ### MySQL ###
 # If a MySQL database is used:
@@ -31,6 +70,3 @@ dbuser=$app
 ynh_mysql_drop_db "$dbname" || true
 ynh_mysql_drop_user "$dbuser" || true
 ### MySQL end ###
-
-# Reload nginx service
-sudo service nginx reload
diff --git a/scripts/restore b/scripts/restore
index 23c300f..2612bb9 100644
--- a/scripts/restore
+++ b/scripts/restore
@@ -28,8 +28,8 @@ sudo cp -a ./sources "$src_path"
 #
 # TO BE TESTED AND VALIDATED
 #
-cp -a ./flarum_composer /opt/flarum_composer
-cp -a ./local_composer /usr/local/bin/composer
+cp -a ./flarum_composer /opt/${app}_composer
+#cp -a ./local_composer /usr/local/bin/composer
 
 # Restore permissions to app files
 # you may need to make some file and/or directory writeable by www-data (nginx user)