Adding a new taxonomy term from a custom content type field

Question

Is it possible to automatically add a new taxonomy term (related to certain vocabulary) from a field in a custom content type; so when submitting a new content entry (related to that custom content type) I add a new taxonomy term related to that entry to create a richer tagging functionality by time for future entries?

Answer 1

Check out taxonomy_save_term(). Here's an example from the comments:

$term = array(
'vid' => 5, // Voacabulary ID
'name' => 'Drupal', // Term Name
'synonyms' => 'Druplet', // (Optional) Synonym of this term
'parent' => 11, // (Optional) Term ID of a parent term 
'relations' => array(15), // (Optional) Related Term IDs
);

taxonomy_save_term($term);

You could use this inside hook_nodeapi() on the operations insert or presave (and update). See the comments at the first link for more info.

EDIT: For drupal 7 you have to check out the node api instead of of hook_nodeapi().