LearnDash

Method: Get the sanitize function

Method: Get the validation rule

Method: Retrieve all validation errors;

Method: Retrieve the errors relate to a single property.

Method: Set value of an object property.

Method: Returns the element at the specified offset.

Method: Sets the element at the specified offset.

Method: Returns whether there is an element at the specified offset.

Method: Sets the element value at the specified offset to null.

Method: In model, we going to parse the annotations if any.