Set term to post id, create term if it does not exist

ff-set-post-term-with-fallback.php

// Set post term to post id, create term if it does not exist
function ff_set_post_term_with_fallback($post_id, $value, $taxonomy, $create_new = true ){
	if( $value == '' ) return;
	// Search term
	$term = term_exists( $value, $taxonomy);
	if( $term ) {
		// Term exists
		wp_set_post_terms( $post_id, $term['term_id'], $taxonomy, true );
	} else {
		// Term does not exist, create new
		if( $create_new ) {
			// Create new term
			$new_term = wp_insert_term($value, $taxonomy);
			if( $new_term ) {
				wp_set_post_terms( $post_id, $new_term, $taxonomy, true );
			}
		}
	}
}