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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.
This hook occurs 2 times in this file.
| Line | Code |
|---|---|
| 143 | |
| 144 | if ( !empty( $prev_value ) ) { |
| 145 | $prev_value = maybe_serialize($prev_value); |
| 146 | $where['meta_value'] = $prev_value; |
| 147 | } |
| 148 | |
| 149 | do_action( "update_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value ); |
| 150 | |
| 151 | if ( 'post' == $meta_type ) |
| 152 | do_action( 'update_postmeta', $meta_id, $object_id, $meta_key, $meta_value ); |
| 153 | |
| 154 | $wpdb->update( $table, $data, $where ); |
| 155 | |
| 156 | wp_cache_delete($object_id, $meta_type . '_meta'); |
| 157 | |
| 158 | do_action( "updated_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value ); |
| 159 | |
| 160 | if ( 'post' == $meta_type ) |
| 161 | do_action( 'updated_postmeta', $meta_id, $object_id, $meta_key, $meta_value ); |
| Line | Code |
| 424 | ); |
| 425 | |
| 426 | // Format the where query arguments. |
| 427 | $where = array(); |
| 428 | $where[$id_column] = $meta_id; |
| 429 | |
| 430 | do_action( "update_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value ); |
| 431 | |
| 432 | if ( 'post' == $meta_type ) |
| 433 | do_action( 'update_postmeta', $meta_id, $object_id, $meta_key, $meta_value ); |
| 434 | |
| 435 | // Run the update query, all fields in $data are %s, $where is a %d. |
| 436 | $result = (bool) $wpdb->update( $table, $data, $where, '%s', '%d' ); |
| 437 | |
| 438 | // Clear the caches. |
| 439 | wp_cache_delete($object_id, $meta_type . '_meta'); |
| 440 | |
| 441 | do_action( "updated_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value ); |
| 442 | |