Coding style


All classes should follow the PSR-2 coding style.

Naming conventions

Interfaces must have the suffix Interface and traits the suffix Trait. Normal and abstract classes have no special marker.

Type Example
Class News
Abstract BasicNews
Interface NewsInterface
Trait NewsTrait

In general classes should have a descriptive name so that users can easily find the class and understand the function of it. Here some example of good class names:

  • NewsAdminController
  • NewsRecordDeletedListener
  • NewsEventProvider
  • NewsFeed
  • News
  • LockManager
  • Mail
  • FileSystem

The class NewsAdminController has the News prefix since AdminController is difficult to find because almost every module has an AdminController. The class LockManager has no prefix because it is very unlikely that we have many lock managers.

Every class must have also a php block containing at least the @author annotation. The doc block must have also a general description of the class. In the following an example class doc block:

 * My class description
 * @author


Like defined in PSR-2 method names must be in CamelCase with the first character as lowercase. If the method returns a boolean value it is recommended to use the is/has prefix to indicate the response type.

In case a class implements an interface it is possible to use the @inheritdoc annotation to indicate that the description of the interface is also valid for this method. If the method has a special behaviour you should avoid the @inheritdoc annotation and describe this behaviour in a separate php doc block.


A constant name in a class consist usually of a group and value name. These values must be concatenated with an underscore [group]_[value]. Constants must not have a type prefix. Example of good constant names are:

const STATE_VALID = 1;


The namespace must start with a vendor name which is in our case Kajona. The next part is the module name which is the CamelCase name of the module (without the module_ prefix). The rest of the path represents the folder structure inside the module. In the following as example some class to file mappings:

Class File
Kajona\News\System\News core\module_news\system\News.php
Kajona\News\System\Validators\EmailValidator core\module_news\system\validators\EmailValidator.php

Folder names

It is possible to create arbitrary folder hierarchies inside a module. Folders inside the system/ folder should have plural names.


Writing comments help other developers to understand a class or method. The following table shows for which components you should/must write detailed php comments. With comments we mean a text describing the behaviour, comments which describe the parameters and types must be always added.

Priority Description Required
1 interfaces and abstract methods yes
2 classes and public methods yes
3 protected methods yes
4 private methods only required if the method is complex


We use an AMD loader to split up our javascript code base into multiple modules. Each module must be documented using the JSDoc syntax to document the defined functions and objects. For more information take a look at:

In the following some examples how to document a module. In case you return a variable you have to use the @exports annotation:

 * @module mymodule
define('mymodule', ['dep1', 'dep2'], function (foo, bar) {

    /** @exports mymodule */
    var obj = {};

    return obj;


In case you return directly an object you have to use the @alias annotation:

 * @module mymodule
define('mymodule', ['dep1', 'dep2'], function (foo, bar) {

    return /** @alias module:mymodule */ {
        foo: function(){
            return "bar";

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