Post with Bundle #1

Term-related conditions expect that you supply them with a term descriptor as the value (an array of term descriptors for the IN and NOT IN operators).

More information on these values can be found in the documentation of the get_term_by() (opens new window) function in the WordPress Code Reference (the three keys here are identical to the first three arguments of this function).

Triggered when a field is being validated. This event actually behaves like a WordPress filter – you have to return a value. This enables you to define your own custom validation and error messages (an example can be found below).

A Field Name Pattern is a string which is used as a way to refer to a specific field when using the PHP or JavaScript APIs (mainly when getting or setting a field’s value).