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To save our bandwidth, we show only a snippet of code around each occurence of the hook. View complete file in SVN (without highlighting).
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 |
|---|---|
| 235 | * Fires immediately before updating a post's metadata. |
| 236 | * |
| 237 | * @since 2.9.0 |
| 238 | * |
| 239 | * @param int $meta_id ID of metadata entry to update. |
| 240 | * @param int $object_id Object ID. |
| 241 | * @param string $meta_key Meta key. |
| 242 | * @param mixed $meta_value Meta value. |
| 243 | */ |
| 244 | do_action( 'update_postmeta', $meta_id, $object_id, $meta_key, $meta_value ); |
| 245 | } |
| 246 | } |
| 247 | |
| 248 | $result = $wpdb->update( $table, $data, $where ); |
| 249 | if ( ! $result ) |
| 250 | return false; |
| 251 | |
| 252 | wp_cache_delete($object_id, $meta_type . '_meta'); |
| 253 | |
| Line | Code |
| 645 | // Format the where query arguments. |
| 646 | $where = array(); |
| 647 | $where[$id_column] = $meta_id; |
| 648 | |
| 649 | /** This action is documented in wp-includes/meta.php */ |
| 650 | do_action( "update_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value ); |
| 651 | |
| 652 | if ( 'post' == $meta_type ) { |
| 653 | /** This action is documented in wp-includes/meta.php */ |
| 654 | do_action( 'update_postmeta', $meta_id, $object_id, $meta_key, $meta_value ); |
| 655 | } |
| 656 | |
| 657 | // Run the update query, all fields in $data are %s, $where is a %d. |
| 658 | $result = $wpdb->update( $table, $data, $where, '%s', '%d' ); |
| 659 | if ( ! $result ) |
| 660 | return false; |
| 661 | |
| 662 | // Clear the caches. |
| 663 | wp_cache_delete($object_id, $meta_type . '_meta'); |