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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 |
|---|---|
| 203 | $query .= $wpdb->prepare(" AND $type_column = %d", $object_id ); |
| 204 | |
| 205 | if ( $meta_value ) |
| 206 | $query .= $wpdb->prepare(" AND meta_value = %s", $meta_value ); |
| 207 | |
| 208 | $meta_ids = $wpdb->get_col( $query ); |
| 209 | if ( !count( $meta_ids ) ) |
| 210 | return false; |
| 211 | |
| 212 | do_action( "delete_{$meta_type}_meta", $meta_ids, $object_id, $meta_key, $_meta_value ); |
| 213 | |
| 214 | $query = "DELETE FROM $table WHERE $id_column IN( " . implode( ',', $meta_ids ) . " )"; |
| 215 | |
| 216 | $count = $wpdb->query($query); |
| 217 | |
| 218 | if ( !$count ) |
| 219 | return false; |
| 220 | |
| 221 | wp_cache_delete($object_id, $meta_type . '_meta'); |