// Any term found in the cache is not a match, so don't use it.
$_term = false;
// Grab all matching terms, in case any are shared between taxonomies.
$terms = $wpdb->get_results( $wpdb->prepare( "SELECT t.*, tt.* FROM $wpdb->terms AS t INNER JOIN $wpdb->term_taxonomy AS tt ON t.term_id = tt.term_id WHERE t.term_id = %d", $term_id ) );
if ( ! $terms ) {
return false;
}
// If a taxonomy was specified, find a match.
if ( $taxonomy ) {
foreach ( $terms as $match ) {
if ( $taxonomy === $match->taxonomy ) {
$_term = $match;
break;
}
}
// If only one match was found, it's the one we want.
} elseif ( 1 === count( $terms ) ) {
$_term = reset( $terms );
// Otherwise, the term must be shared between taxonomies.
} else {
// If the term is shared only with invalid taxonomies, return the one valid term.
foreach ( $terms as $t ) {
if ( ! taxonomy_exists( $t->taxonomy ) ) {
continue;
}
// Only hit if we've already identified a term in a valid taxonomy.
if ( $_term ) {
return new WP_Error( 'ambiguous_term_id', __( 'Term ID is shared between multiple taxonomies' ), $term_id );
}
$_term = $t;
}
}
if ( ! $_term ) {
return false;
}
// Don't return terms from invalid taxonomies.
if ( ! taxonomy_exists( $_term->taxonomy ) ) {
return new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy.' ) );