February 12, 2011 
Definition:
function is_object_in_term( $object_id, $taxonomy, $terms = null ) {}
Determine if the given object is associated with any of the given terms.
The given terms are checked against the object’s terms’ term_ids, names and slugs. Terms given as integers will only be checked against the object’s terms’ term_ids. If no terms are given, determines if object is associated with any terms in the given taxonomy.
Parameters
- int $object_id: ID of the object (post ID, link ID, …)
- string $taxonomy: Single taxonomy name
- int|string|array $terms: Optional. Term term_id, name, slug or array of said
Return values
returns:WP_Error on input error.
Source code
function is_object_in_term( $object_id, $taxonomy, $terms = null ) {
if ( !$object_id = (int) $object_id )
return new WP_Error( 'invalid_object', __( 'Invalid object ID' ) );
$object_terms = get_object_term_cache( $object_id, $taxonomy );
if ( empty( $object_terms ) )
$object_terms = wp_get_object_terms( $object_id, $taxonomy );
if ( is_wp_error( $object_terms ) )
return $object_terms;
if ( empty( $object_terms ) )
return false;
if ( empty( $terms ) )
return ( !empty( $object_terms ) );
$terms = (array) $terms;
if ( $ints = array_filter( $terms, 'is_int' ) )
$strs = array_diff( $terms, $ints );
else
$strs =& $terms;
foreach ( $object_terms as $object_term ) {
if ( $ints && in_array( $object_term->term_id, $ints ) ) return true; // If int, check against term_id
if ( $strs ) {
if ( in_array( $object_term->term_id, $strs ) ) return true;
if ( in_array( $object_term->name, $strs ) ) return true;
if ( in_array( $object_term->slug, $strs ) ) return true;
}
}
return false;
}
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