Guidelines and coding standards


PHP Code

Your PHP code should be compatible with PHP compatibility chart

HTML / CSS / Javascript

Your HTML/CSS/JS code should work with at least:

  • Edge
  • Firefox 45
  • Chrome 29.


  • iOS 8.4
  • Android Browser 4.4



Use spaces for indentation in every language (PHP, HTML, CSS, etc.):
4 spaces for PHP files, 2 spaces for all other file types.

Use our .editorconfig file in order to easily configure your editor:

PHP files

You should follow the PSR-2 standard, just like PrestaShop does.

In general, we tend to follow the Symfony coding standards.

HTML files

Use HTML 5 tags:

  • <br /><br>
  • <nav>
  • <section>
  • etc.

All open tags must be closed in the same file (a <div> should not be opened in header.tpl then closed in footer.tpl). Subtemplates (templates meant to be included in another template) must reside inside a /_partials/ folder.

CSS files

Use CSS3.

We recommend that you follow the RSCSS structure


Make sure your linter tool follows our .eslint file:

If you wish to write ECMAScript 2015 (ES6) code, we recommend using the Babel compiler to maximize compatibility.

A good JS practice consists in splitting files per use, and then compiling them into one.

Learn more about the ES2015 standard: