Environment configuration (Docker)

FreshRSS is built with PHP and uses a homemade framework, Minz. The dependencies are directly included in the source code, so you don’t need Composer.

There are various ways to configure your development environment. The easiest and most supported method is based on Docker, which is the solution documented below. If you already have a working PHP environment, you probably don’t need it.

We assume here that you use a GNU/Linux distribution, capable of running Docker. Otherwise, you’ll have to adapt the commands accordingly.

The commands that follow have to be executed in a console. They start by $ when commands need to be executed as normal user, and by # when they need to be executed as root user. You don’t have to type these characters. A path may be indicated before these characters to help you identify where they need to be executed. For instance, app$ echo 'Hello World' indicates that you have to execute echo command in the app/ directory.

First, you need to install Docker.

Once you’re done, clone the repository with:

git clone https://github.com/FreshRSS/FreshRSS.git
cd FreshRSS

Note that, if you want to contribute, you have to fork the repository first and clone your fork instead of the “root” one. Adapt the commands in consequence.

Then, the only command you need to know is the following:

make start

This might take some time while Docker downloads the image. If your user isn’t in the docker group, you’ll need to prepend the command with sudo.

You can now access FreshRSS at http://localhost:8080. Just follow the install process and select the SQLite database.

You can stop the containers by typing Control + c or with the following command, in another terminal:

make stop

If you’re interested in the configuration, the make commands are defined in the Makefile.

If you need to use a different tag image (default is alpine), you can set the TAG environment variable:

TAG=arm make start

You can find the full list of available tags on the Docker hub.

If you want to build the Docker image yourself, you can use the following command:

make build
# or
TAG=arm make build

The TAG variable can be anything (e.g. local). You can target a specific architecture by adding -alpine or -arm at the end of the tag (e.g. local-arm).

Project architecture


If you want to create your own FreshRSS extension, take a look at the extension documentation.

Coding style

If you want to contribute to the source code, it’s important to follow the project’s coding style. The actual code doesn’t always follow it throughout the project, but we should fix it every time an opportunity presents itself.

Contributions which don’t follow the coding style will be rejected as long as the coding style is not fixed.

Spaces, tabs and other whitespace characters


Code indentation must use tabs.


Once the code has been correctly indented, it might be useful to align it for ease of reading. In that case, please use spaces.

$result = a_function_with_a_really_long_name($param1, $param2,
                                             $param3, $param4);

End of line

The newline character must be a line feed (LF), which is the default line ending on *NIX systems. This character must not follow other white space.

You can verify if there is any unintended white space at the end of line with the following Git command:

# command to check files before adding them in the Git index
git diff --check
# command to check files after adding them in the Git index
git diff --check --cached

End of file

Every file must end by an empty line.

Commas, dots and semi-columns

There should no space before those characters, but there should be one after.


There should be a space before and after every operator.

if ($a == 10) {
	// do something

echo $a ? 1 : 0;


There should be no spaces in between brackets. There should be no spaces before the opening bracket, except if it’s after a keyword. There shouldn’t be any spaces after the closing bracket, except if it’s followed by a curly bracket.

if ($a == 10) {
	// do something

if ((int)$a == 10) {
	// do something

With chained functions

It happens most of the time in Javascript files. When there are chained functions with closures and callback functions, it’s hard to understand the code if not properly formatted. In those cases, we add a new indent level for the complete instruction and reset the indent for a new instruction on the same level.

// First instruction
shortcut.add(shortcuts.mark_read, function () {
	}, {
		'disable_in_input': true
// Second instruction
shortcut.add("shift+" + shortcuts.mark_read, function () {
	}, {
		'disable_in_input': true

Line length

Lines should strive to be shorter than 80 characters. However, this limit may be extended to 100 characters when strictly necessary.

With functions, parameters can be declared on multiple lines.

function my_function($param_1, $param_2,
                     $param_3, $param_4) {
	// do something


All code elements (functions, classes, methods and variables) must describe their usage succinctly.

Functions and variables

Functions and variables must follow the “snake case” naming convention.

// a function
function function_name() {
	// do something
// a variable


Methods must follow the “lower camel case” naming convention.

private function methodName() {
	// do something


Classes must follow the “upper camel case” naming convention.

abstract class ClassName {}


Files must be encoded with the UTF-8 character set.

PHP compatibility

Please ensure that your code works with the oldest PHP version officially supported by FreshRSS.



Operators must be at the end of the line if a condition is split over more than one line.

if ($a == 10 ||
    $a == 20) {
	// do something

End of file

If the file contains only PHP code, the PHP closing tag must be omitted.


If an array declaration runs on more than one line, each element must be followed by a comma, including the last one.

$variable = [
	"value 1",
	"value 2",
	"value 3",