How to set Term Reference value using PHP?

Hi,

I have a webform that has a select list of taxonomy terms.

Once the webform is submitted, I'd like to use the submitted value of the select list to set a Term Reference field value.

In other cases when I use Rules to set Text-based fields from webform data, it is simple because I can call the webform component and set the data value to my "entity_created" variable. However, for this Term Reference list, I am not presented a PHP field to complete and am forced to select an item from the list instead of specifying a submitted value from the webform.

Any help is appreciated!