[DeadPublic] Idea for a package

[TomasVotruba]

Looks for unused public elements in the code

• unused function
• unused public class constant
• unused public class property
• unused public class method

Resources

• https://stackoverflow.com/questions/11532/how-can-i-find-unused-functions-in-a-php-project
• https://github.com/sebastianbergmann/phpdcd
• Remove buggy rules that depend on false condition of all class and calls analysis, to improve static reflection rectorphp/rector#5958 - Rector rules inspiration

Idea

• use simple PHPStan scope resolver for types
• collect public methods, collect their callers
• compare it and show the diff

[TomasVotruba]

Not priority ATM