diff --git a/conf/nginx.conf b/conf/nginx.conf
index e3ea572..9dea88f 100644
--- a/conf/nginx.conf
+++ b/conf/nginx.conf
@@ -16,7 +16,7 @@ location __PATH__/ {
   try_files $uri $uri/ index.php;
   location ~ [^/]\.php(/|$) {
     fastcgi_split_path_info ^(.+?\.php)(/.*)$;
-    fastcgi_pass unix:/var/run/php5-fpm-__NAME__.sock;
+    fastcgi_pass unix:/var/run/php7.1-fpm-__NAME__.sock;
 
     fastcgi_index index.php;
     include fastcgi_params;
diff --git a/conf/php-fpm.conf b/conf/php-fpm.conf
index 2aec4a2..98cb11a 100644
--- a/conf/php-fpm.conf
+++ b/conf/php-fpm.conf
@@ -30,7 +30,7 @@ group = __USER__
 ;                            specific port;
 ;   '/path/to/unix/socket' - to listen on a unix socket.
 ; Note: This value is mandatory.
-listen = /var/run/php5-fpm-__NAMETOCHANGE__.sock
+listen = /var/run/php7.1-fpm-__NAMETOCHANGE__.sock
 
 ; Set listen(2) backlog. A value of '-1' means unlimited.
 ; Default Value: 128 (-1 on FreeBSD and OpenBSD)
diff --git a/scripts/_common.sh b/scripts/_common.sh
index 12587b9..04db66c 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -1,5 +1,17 @@
 #!/bin/bash
 
+#=================================================
+# COMMON VARIABLES
+#=================================================
+
+# dependencies used by the app
+php_version="7.1"
+php_packages="php7.1-tidy php7.1-intl php7.1-mbstring php7.1-mysql php7.1-xml php7.1-gd"
+
+#=================================================
+# EXPERIMENTAL HELPERS
+#=================================================
+
 # Send an email to inform the administrator
 #
 # usage: ynh_send_readme_to_admin app_message [recipients]
@@ -48,3 +60,372 @@ $(yunohost tools diagnosis | grep -B 100 "services:" | sed '/services:/d')"
 	# Send the email to the recipients
 	echo "$mail_message" | mail -a "Content-Type: text/plain; charset=UTF-8" -s "$mail_subject" "$recipients"
 }
+
+# Install another version of php.
+#
+# usage: ynh_install_php --phpversion=phpversion [--package=packages]
+# | arg: -v, --phpversion - Version of php to install. Can be one of 7.1, 7.2 or 7.3
+# | arg: -p, --package - Additionnal php packages to install
+ynh_install_php () {
+	# Declare an array to define the options of this helper.
+	local legacy_args=vp
+	declare -Ar args_array=( [v]=phpversion= [p]=package= )
+	local phpversion
+	local package
+	# Manage arguments with getopts
+	ynh_handle_getopts_args "$@"
+	package=${package:-}
+
+	# Store php_version into the config of this app
+	ynh_app_setting_set $app php_version $phpversion
+
+	if [ "$phpversion" == "7.0" ]
+	then
+		ynh_die "Do not use ynh_install_php to install php7.0"
+	fi
+
+	# Store the ID of this app and the version of php requested for it
+	echo "$YNH_APP_INSTANCE_NAME:$phpversion" | tee --append "/etc/php/ynh_app_version"
+
+	# Add an extra repository for those packages
+	ynh_install_extra_repo --repo="https://packages.sury.org/php/ $(lsb_release -sc) main" --key="https://packages.sury.org/php/apt.gpg" --priority=995 --name=extra_php_version
+
+	# Install requested dependencies from this extra repository.
+	# Install php-fpm first, otherwise php will install apache as a dependency.
+	ynh_add_app_dependencies --package="php${phpversion}-fpm"
+	ynh_add_app_dependencies --package="php$phpversion php${phpversion}-common $package"
+
+	# Set php7.0 back as the default version for php-cli.
+	update-alternatives --set php /usr/bin/php7.0
+
+	# Remove this extra repository after packages are installed
+	ynh_remove_extra_repo --name=extra_php_version
+
+	# Advertise service in admin panel
+	yunohost service add php${phpversion}-fpm --log "/var/log/php${phpversion}-fpm.log"
+}
+
+ynh_remove_php () {
+	# Get the version of php used by this app
+	local phpversion=$(ynh_app_setting_get $app php_version)
+
+	if [ "$phpversion" == "7.0" ] || [ -z "$phpversion" ]
+	then
+		if [ "$phpversion" == "7.0" ]
+		then
+			ynh_print_err "Do not use ynh_remove_php to install php7.0"
+		fi
+		return 0
+	fi
+
+	# Remove the line for this app
+	sed --in-place "/$YNH_APP_INSTANCE_NAME:$phpversion/d" "/etc/php/ynh_app_version"
+
+	# If no other app uses this version of php, remove it.
+	if ! grep --quiet "$phpversion" "/etc/php/ynh_app_version"
+	then
+		# Purge php dependences for this version.
+		ynh_package_autopurge "php$phpversion php${phpversion}-fpm php${phpversion}-common"
+		# Remove the service from the admin panel
+		yunohost service remove php${phpversion}-fpm
+	fi
+
+	# If no other app uses alternate php versions, remove the extra repo for php
+	if [ ! -s "/etc/php/ynh_app_version" ]
+	then
+		ynh_secure_remove /etc/php/ynh_app_version
+	fi
+}
+
+# Pin a repository.
+#
+# usage: ynh_pin_repo --package=packages --pin=pin_filter [--priority=priority_value] [--name=name] [--append]
+# | arg: -p, --package - Packages concerned by the pin. Or all, *.
+# | arg: -i, --pin - Filter for the pin.
+# | arg: -p, --priority - Priority for the pin
+# | arg: -n, --name - Name for the files for this repo, $app as default value.
+# | arg: -a, --append - Do not overwrite existing files.
+#
+# See https://manpages.debian.org/stretch/apt/apt_preferences.5.en.html for information about pinning.
+#
+ynh_pin_repo () {
+	# Declare an array to define the options of this helper.
+	local legacy_args=pirna
+	declare -Ar args_array=( [p]=package= [i]=pin= [r]=priority= [n]=name= [a]=append )
+	local package
+	local pin
+	local priority
+	local name
+	local append
+	# Manage arguments with getopts
+	ynh_handle_getopts_args "$@"
+	package="${package:-*}"
+	priority=${priority:-50}
+	name="${name:-$app}"
+	append=${append:-0}
+
+	if [ $append -eq 1 ]
+	then
+		append="tee -a"
+	else
+		append="tee"
+	fi
+
+	mkdir -p "/etc/apt/preferences.d"
+	echo "Package: $package
+Pin: $pin
+Pin-Priority: $priority" \
+	| $append "/etc/apt/preferences.d/$name"
+}
+
+# Add a repository.
+#
+# usage: ynh_add_repo --uri=uri --suite=suite --component=component [--name=name] [--append]
+# | arg: -u, --uri - Uri of the repository.
+# | arg: -s, --suite - Suite of the repository.
+# | arg: -c, --component - Component of the repository.
+# | arg: -n, --name - Name for the files for this repo, $app as default value.
+# | arg: -a, --append - Do not overwrite existing files.
+#
+# Example for a repo like deb http://forge.yunohost.org/debian/ stretch stable
+#                             uri                               suite   component
+# ynh_add_repo --uri=http://forge.yunohost.org/debian/ --suite=stretch --component=stable
+#
+ynh_add_repo () {
+	# Declare an array to define the options of this helper.
+	local legacy_args=uscna
+	declare -Ar args_array=( [u]=uri= [s]=suite= [c]=component= [n]=name= [a]=append )
+	local uri
+	local suite
+	local component
+	local name
+	local append
+	# Manage arguments with getopts
+	ynh_handle_getopts_args "$@"
+	name="${name:-$app}"
+	append=${append:-0}
+
+	if [ $append -eq 1 ]
+	then
+		append="tee -a"
+	else
+		append="tee"
+	fi
+
+	mkdir -p "/etc/apt/sources.list.d"
+	# Add the new repo in sources.list.d
+	echo "deb $uri $suite $component" \
+		| $append "/etc/apt/sources.list.d/$name.list"
+}
+
+# Add an extra repository correctly, pin it and get the key.
+#
+# usage: ynh_install_extra_repo --repo="repo" [--key=key_url] [--priority=priority_value] [--name=name] [--append]
+# | arg: -r, --repo - Complete url of the extra repository.
+# | arg: -k, --key - url to get the public key.
+# | arg: -p, --priority - Priority for the pin
+# | arg: -n, --name - Name for the files for this repo, $app as default value.
+# | arg: -a, --append - Do not overwrite existing files.
+ynh_install_extra_repo () {
+	# Declare an array to define the options of this helper.
+	local legacy_args=rkpna
+	declare -Ar args_array=( [r]=repo= [k]=key= [p]=priority= [n]=name= [a]=append )
+	local repo
+	local key
+	local priority
+	local name
+	local append
+	# Manage arguments with getopts
+	ynh_handle_getopts_args "$@"
+	name="${name:-$app}"
+	append=${append:-0}
+	key=${key:-0}
+	priority=${priority:-}
+
+	if [ $append -eq 1 ]
+	then
+		append="--append"
+		wget_append="tee -a"
+	else
+		append=""
+		wget_append="tee"
+	fi
+
+	# Split the repository into uri, suite and components.
+	# Remove "deb " at the beginning of the repo.
+	repo="${repo#deb }"
+
+	# Get the uri
+	local uri="$(echo "$repo" | awk '{ print $1 }')"
+
+	# Get the suite
+	local suite="$(echo "$repo" | awk '{ print $2 }')"
+
+	# Get the components
+	local component="${repo##$uri $suite }"
+
+	# Add the repository into sources.list.d
+	ynh_add_repo --uri="$uri" --suite="$suite" --component="$component" --name="$name" $append
+
+	# Pin the new repo with the default priority, so it won't be used for upgrades.
+	# Build $pin from the uri without http and any sub path
+	local pin="${uri#*://}"
+	pin="${pin%%/*}"
+	# Set a priority only if asked
+	if [ -n "$priority" ]
+	then
+		priority="--priority=$priority"
+	fi
+	ynh_pin_repo --package="*" --pin="origin \"$pin\"" $priority --name="$name" $append
+
+	# Get the public key for the repo
+	if [ -n "$key" ]
+	then
+		mkdir -p "/etc/apt/trusted.gpg.d"
+		wget -q "$key" -O - | gpg --dearmor | $wget_append /etc/apt/trusted.gpg.d/$name.gpg > /dev/null
+	fi
+
+	# Update the list of package with the new repo
+	ynh_package_update
+}
+
+# Remove an extra repository and the assiociated configuration.
+#
+# usage: ynh_remove_extra_repo [--name=name]
+# | arg: -n, --name - Name for the files for this repo, $app as default value.
+ynh_remove_extra_repo () {
+	# Declare an array to define the options of this helper.
+	local legacy_args=n
+	declare -Ar args_array=( [n]=name= )
+	local name
+	# Manage arguments with getopts
+	ynh_handle_getopts_args "$@"
+	name="${name:-$app}"
+
+	ynh_secure_remove "/etc/apt/sources.list.d/$name.list"
+	ynh_secure_remove "/etc/apt/preferences.d/$name"
+	ynh_secure_remove "/etc/apt/trusted.gpg.d/$name.gpg"
+	ynh_secure_remove "/etc/apt/trusted.gpg.d/$name.asc"
+
+	# Update the list of package to exclude the old repo
+	ynh_package_update
+}
+
+# Install packages from an extra repository properly.
+#
+# usage: ynh_install_extra_app_dependencies --repo="repo" --package="dep1 dep2" [--key=key_url] [--name=name]
+# | arg: -r, --repo - Complete url of the extra repository.
+# | arg: -p, --package - The packages to install from this extra repository
+# | arg: -k, --key - url to get the public key.
+# | arg: -n, --name - Name for the files for this repo, $app as default value.
+ynh_install_extra_app_dependencies () {
+	# Declare an array to define the options of this helper.
+	local legacy_args=rpkn
+	declare -Ar args_array=( [r]=repo= [p]=package= [k]=key= [n]=name= )
+	local repo
+	local package
+	local key
+	local name
+	# Manage arguments with getopts
+	ynh_handle_getopts_args "$@"
+	name="${name:-$app}"
+	key=${key:-0}
+
+	# Set a key only if asked
+	if [ -n "$key" ]
+	then
+		key="--key=$key"
+	fi
+	# Add an extra repository for those packages
+	ynh_install_extra_repo --repo="$repo" $key --priority=995 --name=$name
+
+	# Install requested dependencies from this extra repository.
+	ynh_add_app_dependencies --package="$package"
+
+	# Remove this extra repository after packages are installed
+	ynh_remove_extra_repo --name=$app
+}
+
+#=================================================
+
+# patched version of ynh_install_app_dependencies to be used with ynh_add_app_dependencies
+
+# Define and install dependencies with a equivs control file
+# This helper can/should only be called once per app
+#
+# usage: ynh_install_app_dependencies dep [dep [...]]
+# | arg: dep - the package name to install in dependence
+#   You can give a choice between some package with this syntax : "dep1|dep2"
+#   Example : ynh_install_app_dependencies dep1 dep2 "dep3|dep4|dep5"
+#   This mean in the dependence tree : dep1 & dep2 & (dep3 | dep4 | dep5)
+#
+# Requires YunoHost version 2.6.4 or higher.
+ynh_install_app_dependencies () {
+    local dependencies=$@
+    dependencies="$(echo "$dependencies" | sed 's/\([^\<=\>]\)\ \([^(]\)/\1, \2/g')"
+    dependencies=${dependencies//|/ | }
+    local manifest_path="../manifest.json"
+    if [ ! -e "$manifest_path" ]; then
+    	manifest_path="../settings/manifest.json"	# Into the restore script, the manifest is not at the same place
+    fi
+
+    local version=$(grep '\"version\": ' "$manifest_path" | cut -d '"' -f 4)	# Retrieve the version number in the manifest file.
+    if [ ${#version} -eq 0 ]; then
+        version="1.0"
+    fi
+    local dep_app=${app//_/-}	# Replace all '_' by '-'
+
+    # Handle specific versions
+    if [[ "$dependencies" =~ [\<=\>] ]]
+    then
+        # Replace version specifications by relationships syntax
+        # https://www.debian.org/doc/debian-policy/ch-relationships.html
+        # Sed clarification
+        # [^(\<=\>] ignore if it begins by ( or < = >. To not apply twice.
+        # [\<=\>] matches < = or >
+        # \+ matches one or more occurence of the previous characters, for >= or >>.
+        # [^,]\+ matches all characters except ','
+        # Ex: package>=1.0 will be replaced by package (>= 1.0)
+        dependencies="$(echo "$dependencies" | sed 's/\([^(\<=\>]\)\([\<=\>]\+\)\([^,]\+\)/\1 (\2 \3)/g')"
+    fi
+
+    cat > /tmp/${dep_app}-ynh-deps.control << EOF	# Make a control file for equivs-build
+Section: misc
+Priority: optional
+Package: ${dep_app}-ynh-deps
+Version: ${version}
+Depends: ${dependencies}
+Architecture: all
+Description: Fake package for $app (YunoHost app) dependencies
+ This meta-package is only responsible of installing its dependencies.
+EOF
+    ynh_package_install_from_equivs /tmp/${dep_app}-ynh-deps.control \
+        || ynh_die --message="Unable to install dependencies"	# Install the fake package and its dependencies
+    rm /tmp/${dep_app}-ynh-deps.control
+    ynh_app_setting_set --app=$app --key=apt_dependencies --value="$dependencies"
+}
+
+ynh_add_app_dependencies () {
+	# Declare an array to define the options of this helper.
+	local legacy_args=pr
+	declare -Ar args_array=( [p]=package= [r]=replace)
+	local package
+	local replace
+	# Manage arguments with getopts
+	ynh_handle_getopts_args "$@"
+	replace=${replace:-0}
+
+	local current_dependencies=""
+	if [ $replace -eq 0 ]
+	then
+		local dep_app=${app//_/-}	# Replace all '_' by '-'
+		if ynh_package_is_installed --package="${dep_app}-ynh-deps"
+		then
+			current_dependencies="$(dpkg-query --show --showformat='${Depends}' ${dep_app}-ynh-deps) "
+		fi
+
+		current_dependencies=${current_dependencies// | /|}
+	fi
+
+	ynh_install_app_dependencies "${current_dependencies}${package}"
+}
diff --git a/scripts/backup b/scripts/backup
index f6f41c2..1fd4199 100644
--- a/scripts/backup
+++ b/scripts/backup
@@ -45,7 +45,7 @@ ynh_backup "/etc/nginx/conf.d/$domain.d/$app.conf"
 # BACKUP THE PHP-FPM CONFIGURATION
 #=================================================
 
-ynh_backup "/etc/php5/fpm/pool.d/$app.conf"
+ynh_backup "/etc/php/$php_version/fpm/pool.d/$app.conf"
 
 #=================================================
 # BACKUP THE MYSQL DATABASE
diff --git a/scripts/install b/scripts/install
index 878c190..7b94c7b 100755
--- a/scripts/install
+++ b/scripts/install
@@ -49,6 +49,12 @@ ynh_app_setting_set "$app" domain "$domain"
 ynh_app_setting_set "$app" path   "$path_url"
 ynh_app_setting_set "$app" is_public "$is_public"
 
+#=================================================
+# INSTALL DEPENDENCIES
+#=================================================
+
+ynh_install_php --phpversion="$php_version" --package="$php_packages"
+
 #=================================================
 # CREATE A MYSQL DATABASE
 #=================================================
@@ -90,7 +96,7 @@ ynh_system_user_create "$app"
 #=================================================
 
 # Create a dedicated php-fpm config
-ynh_add_fpm_config
+ynh_add_fpm_config --phpversion="$php_version"
 
 #=================================================
 # GENERIC FINALIZATION
diff --git a/scripts/remove b/scripts/remove
index 3804fc7..45f1bce 100755
--- a/scripts/remove
+++ b/scripts/remove
@@ -29,8 +29,7 @@ final_path=$(ynh_app_setting_get "$app" final_path)
 # REMOVE DEPENDENCIES
 #=================================================
 
-# Remove metapackage and its dependencies
-# ynh_remove_app_dependencies
+ynh_remove_php
 
 #=================================================
 # REMOVE THE MYSQL DATABASE
diff --git a/scripts/restore b/scripts/restore
index 18da09d..8a0cb41 100644
--- a/scripts/restore
+++ b/scripts/restore
@@ -87,10 +87,16 @@ done
 # RESTORE THE PHP-FPM CONFIGURATION
 #=================================================
 
-ynh_restore_file "/etc/php5/fpm/pool.d/$app.conf"
+ynh_restore_file "/etc/php/$php_version/fpm/pool.d/$app.conf"
 
 #=================================================
 # SPECIFIC RESTORATION
+#=================================================
+# REINSTALL DEPENDENCIES
+#=================================================
+
+ynh_install_php --phpversion="$php_version" --package="$php_packages"
+
 #=================================================
 # RESTORE THE LOGROTATE CONFIGURATION
 #=================================================
@@ -103,5 +109,5 @@ ynh_restore_file "/etc/logrotate.d/$app"
 # RELOAD NGINX AND PHP-FPM
 #=================================================
 
-systemctl reload php5-fpm
+systemctl reload php7.1-fpm
 systemctl reload nginx
diff --git a/scripts/upgrade b/scripts/upgrade
index b2f042b..37de9ab 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -104,6 +104,12 @@ ynh_secure_remove "$final_path.old"
 # Create a dedicated nginx config
 ynh_add_nginx_config
 
+#=================================================
+# INSTALL DEPENDENCIES
+#=================================================
+
+ynh_install_php --phpversion="$php_version" --package="$php_packages"
+
 #=================================================
 # CREATE DEDICATED USER
 #=================================================
@@ -116,7 +122,7 @@ ynh_system_user_create "$app"
 #=================================================
 
 # Create a dedicated php-fpm config
-ynh_add_fpm_config
+ynh_add_fpm_config --phpversion="$php_version"
 
 #=================================================
 # SPECIFIC UPGRADE