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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 |
|---|---|
| 240 | * object type (comment, post, term, or user). |
| 241 | * |
| 242 | * @since 2.9.0 |
| 243 | * |
| 244 | * @param int $meta_id ID of the metadata entry to update. |
| 245 | * @param int $object_id ID of the object metadata is for. |
| 246 | * @param string $meta_key Metadata key. |
| 247 | * @param mixed $_meta_value Metadata value. Serialized if non-scalar. |
| 248 | */ |
| 249 | do_action( "update_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value ); |
| 250 | |
| 251 | if ( 'post' == $meta_type ) { |
| 252 | /** |
| 253 | * Fires immediately before updating a post's metadata. |
| 254 | * |
| 255 | * @since 2.9.0 |
| 256 | * |
| 257 | * @param int $meta_id ID of metadata entry to update. |
| 258 | * @param int $object_id Post ID. |
| Line | Code |
| 732 | 'meta_key' => $meta_key, |
| 733 | 'meta_value' => $meta_value, |
| 734 | ); |
| 735 | |
| 736 | // Format the where query arguments. |
| 737 | $where = array(); |
| 738 | $where[ $id_column ] = $meta_id; |
| 739 | |
| 740 | /** This action is documented in wp-includes/meta.php */ |
| 741 | do_action( "update_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value ); |
| 742 | |
| 743 | if ( 'post' == $meta_type ) { |
| 744 | /** This action is documented in wp-includes/meta.php */ |
| 745 | do_action( 'update_postmeta', $meta_id, $object_id, $meta_key, $meta_value ); |
| 746 | } |
| 747 | |
| 748 | // Run the update query, all fields in $data are %s, $where is a %d. |
| 749 | $result = $wpdb->update( $table, $data, $where, '%s', '%d' ); |
| 750 | if ( ! $result ) { |