Most of the code used at [museum-digital](https://www.museum-digital.org) is written in PHP. To keep a uniform code style throughout the code, we use [PHP Code Sniffer](https://github.com/squizlabs/PHP_CodeSniffer).
The file [`md_phpcs_rules.xml`](./rules/md_phpcs_rules.xml) contains the main style guide. When rewriting files to fit the uniform style rules, [`md_phpcs_rules_basic.xml`](./rules/md_phpcs_rules_basic.xml) comes in handy as a first step. It contains the same rules, excluding some which require or encourage a more in-depth look at the code (the prohibition of procedural-style calls to mysqli functions is e.g. a good opportunity to check the efficiency of queries).
