I want to write a function that returns users which have entered a certain value to a custom user field.
Lets say there is a custom birthday field for every user. What would be the best way to get all users with a certain birthday?
I could create a DB query that searches the field_data_field_birthday table and returns the entity_id(s) (which in this case would be the users id(s)) for which the field_birthday_value matches a given value and then load the user(s).
This seems a little bit crude, are there generic functions for this use case available? In the entity API or the field API maybe?