implement a coding style guid

[emrysr]

use something like this to ensure the code styling is consistent http://editorconfig.org/

[davehun]

we have a linter that rejects builds if they fail to pass the lint style.

[glynhudson]

Example editor config https://github.com/OpenEVSE/ESP8266_WiFi_v2.x/blob/master/.editorconfig

[carwyn]

I'd recommend using an auto-format on save/commit tool like Golang has enforced and Rust are looking at. This doesn't cover all linting issues but certainly helps, not sure if there are any good ones for PHP? They tend to be a bit more aggressive than editorconfig.

In terms of style guide I'd always advocate on using the upstream guides if they exist, for PHP I think these would be:

• https://www.php-fig.org/psr/psr-1/
• https://www.php-fig.org/psr/psr-2/
• https://github.com/php-fig/fig-standards/blob/master/proposed/extended-coding-style-guide.md