Another example of a static rule is PSR-12, which details coding standards for coding styles, including class, method and function definitions, line breaks, and indentation. Here is an example code snippet that follows PSR-12:test($arg2, $arg3); } return $arg3; } protected function test(&$arg2, $arg3) { $arg2 = 'test'; return $arg3; } }The PSR standards come from the PHP-FIG (PHP Framework Interop Group) which is available as a package library. Different tools and IDEs can implement these standards to help developers write consistent and high-quality code.