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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 |
|---|---|
| 221 | * object type (comment, post, or user). |
| 222 | * |
| 223 | * @since 2.9.0 |
| 224 | * |
| 225 | * @param int $meta_id ID of the metadata entry to update. |
| 226 | * @param int $object_id Object ID. |
| 227 | * @param string $meta_key Meta key. |
| 228 | * @param mixed $meta_value Meta value. |
| 229 | */ |
| 230 | do_action( "update_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value ); |
| 231 | |
| 232 | if ( 'post' == $meta_type ) { |
| 233 | /** |
| 234 | * Fires immediately before updating a post's metadata. |
| 235 | * |
| 236 | * @since 2.9.0 |
| 237 | * |
| 238 | * @param int $meta_id ID of metadata entry to update. |
| 239 | * @param int $object_id Object ID. |
| Line | Code |
| 651 | 'meta_key' => $meta_key, |
| 652 | 'meta_value' => $meta_value |
| 653 | ); |
| 654 | |
| 655 | // Format the where query arguments. |
| 656 | $where = array(); |
| 657 | $where[$id_column] = $meta_id; |
| 658 | |
| 659 | /** This action is documented in wp-includes/meta.php */ |
| 660 | do_action( "update_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value ); |
| 661 | |
| 662 | if ( 'post' == $meta_type ) { |
| 663 | /** This action is documented in wp-includes/meta.php */ |
| 664 | do_action( 'update_postmeta', $meta_id, $object_id, $meta_key, $meta_value ); |
| 665 | } |
| 666 | |
| 667 | // Run the update query, all fields in $data are %s, $where is a %d. |
| 668 | $result = $wpdb->update( $table, $data, $where, '%s', '%d' ); |
| 669 | if ( ! $result ) |