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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 2062 | $terms = $wpdb->get_col("SELECT tr.term_taxonomy_id FROM $wpdb->term_relationships AS tr INNER JOIN $wpdb->term_taxonomy AS tt ON tr.term_taxonomy_id = tt.term_taxonomy_id WHERE tr.object_id IN ($object_ids) AND tt.taxonomy IN ($taxonomies) $orderby $order"); |
| 2063 | foreach ( $terms as $key => $tt_id ) { |
| 2064 | $terms[$key] = sanitize_term_field( 'term_taxonomy_id', $tt_id, 0, $taxonomy, 'raw' ); // 0 should be the term id, however is not needed when using raw context. |
| 2065 | } |
| 2066 | } |
| 2067 | |
| 2068 | if ( ! $terms ) |
| 2069 | $terms = array(); |
| 2070 | |
| 2071 | return apply_filters('wp_get_object_terms', $terms, $object_ids, $taxonomies, $args); |
| 2072 | } |
| 2073 | |
| 2074 | /** |
| 2075 | * Add a new term to the database. |
| 2076 | * |
| 2077 | * A non-existent term is inserted in the following sequence: |
| 2078 | * 1. The term is added to the term table, then related to the taxonomy. |
| 2079 | * 2. If everything is correct, several actions are fired. |
| 2080 | * 3. The 'term_id_filter' is evaluated. |