Impure wordpress functions

[PeterSmith8nss]

I think the following WordPress functions should be listed as impure (e.g. add comment @phpstan-impure in function header) because calling them with the same values at different times can yield different results:

1. wp_mail - success and failure of the call, even if parameters are the same, depends on the state of the system, so can vary with time
2. get_transient - other calls can alter the value of the transient between get_transient calls for the same transient

[szepeviktor]

All right, Peter!

Here is functionMap for you.
https://github.com/php-stubs/wordpress-stubs/blob/master/functionMap.php