WP_Term::get_instance( int $term_id, string $taxonomy = null )
Retrieve WP_Term instance.
Parameters
- $term_id
-
(Required) Term ID.
- $taxonomy
-
(Optional) Limit matched terms to those matching
$taxonomy
. Only used for disambiguating potentially shared terms.Default value: null
Return
(WP_Term|WP_Error|false) Term object, if found. WP_Error if $term_id
is shared between taxonomies and there's insufficient data to distinguish which term is intended. False for other failures.
Source
File: wp-includes/class-wp-term.php
public static function get_instance( $term_id, $taxonomy = null ) {
global $wpdb;
$term_id = (int) $term_id;
if ( ! $term_id ) {
return false;
}
$_term = wp_cache_get( $term_id, 'terms' );
// If there isn't a cached version, hit the database.
if ( ! $_term || ( $taxonomy && $taxonomy !== $_term->taxonomy ) ) {
// 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.' ) );
}
$_term = sanitize_term( $_term, $_term->taxonomy, 'raw' );
// Don't cache terms that are shared between taxonomies.
if ( 1 === count( $terms ) ) {
wp_cache_add( $term_id, $_term, 'terms' );
}
}
$term_obj = new WP_Term( $_term );
$term_obj->filter( $term_obj->filter );
return $term_obj;
}
Changelog
Version | Description |
---|---|
WP-4.4.0 | Introduced. |