February 12, 2011 
Definition:
function get_objects_in_term( $term_ids, $taxonomies, $args = array() {}
Retrieve object_ids of valid taxonomy and term.
The strings of $taxonomies must exist before this function will continue. On failure of finding a valid taxonomy, it will return an WP_Error class, kind of like Exceptions in PHP 5, except you can’t catch them. Even so, you can still test for the WP_Error class and get the error message.
Parameters
- int|array $term_ids: Term id or array of term ids of terms that will be used
- string|array $taxonomies: String of taxonomy name or Array of string values of taxonomy names
- array|string $args: Change the order of the object_ids, either ASC or DESC
Return values
returns:If the taxonomy does not exist, then WP_Error will be returned. On success the array can be empty meaning that there are no $object_ids found or it will return the $object_ids found.
Source code
function get_objects_in_term( $term_ids, $taxonomies, $args = array() ) {
global $wpdb;
if ( ! is_array( $term_ids ) )
$term_ids = array( $term_ids );
if ( ! is_array( $taxonomies ) )
$taxonomies = array( $taxonomies );
foreach ( (array) $taxonomies as $taxonomy ) {
if ( ! taxonomy_exists( $taxonomy ) )
return new WP_Error( 'invalid_taxonomy', __( 'Invalid Taxonomy' ) );
}
$defaults = array( 'order' => 'ASC' );
$args = wp_parse_args( $args, $defaults );
extract( $args, EXTR_SKIP );
$order = ( 'desc' == strtolower( $order ) ) ? 'DESC' : 'ASC';
$term_ids = array_map('intval', $term_ids );
$taxonomies = "'" . implode( "', '", $taxonomies ) . "'";
$term_ids = "'" . implode( "', '", $term_ids ) . "'";
$object_ids = $wpdb->get_col("SELECT tr.object_id FROM $wpdb->term_relationships AS tr INNER JOIN $wpdb->term_taxonomy AS tt ON tr.term_taxonomy_id = tt.term_taxonomy_id WHERE tt.taxonomy IN ($taxonomies) AND tt.term_id IN ($term_ids) ORDER BY tr.object_id $order");
if ( ! $object_ids )
return array();
return $object_ids;
}
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