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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 |
|---|---|
| 279 | * - `update_user_meta` |
| 280 | * |
| 281 | * @since 2.9.0 |
| 282 | * |
| 283 | * @param int $meta_id ID of the metadata entry to update. |
| 284 | * @param int $object_id ID of the object metadata is for. |
| 285 | * @param string $meta_key Metadata key. |
| 286 | * @param mixed $_meta_value Metadata value. |
| 287 | */ |
| 288 | do_action( "update_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value ); |
| 289 | |
| 290 | if ( 'post' === $meta_type ) { |
| 291 | /** |
| 292 | * Fires immediately before updating a post's metadata. |
| 293 | * |
| 294 | * @since 2.9.0 |
| 295 | * |
| 296 | * @param int $meta_id ID of metadata entry to update. |
| 297 | * @param int $object_id Post ID. |
| Line | Code |
| 928 | 'meta_key' => $meta_key, |
| 929 | 'meta_value' => $meta_value, |
| 930 | ); |
| 931 | |
| 932 | // Format the where query arguments. |
| 933 | $where = array(); |
| 934 | $where[ $id_column ] = $meta_id; |
| 935 | |
| 936 | /** This action is documented in wp-includes/meta.php */ |
| 937 | do_action( "update_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value ); |
| 938 | |
| 939 | if ( 'post' === $meta_type ) { |
| 940 | /** This action is documented in wp-includes/meta.php */ |
| 941 | do_action( 'update_postmeta', $meta_id, $object_id, $meta_key, $meta_value ); |
| 942 | } |
| 943 | |
| 944 | // Run the update query, all fields in $data are %s, $where is a %d. |
| 945 | $result = $wpdb->update( $table, $data, $where, '%s', '%d' ); |
| 946 | if ( ! $result ) { |