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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 |
|---|---|
| 297 | * |
| 298 | * @since 2.9.0 |
| 299 | * |
| 300 | * @param int $meta_id ID of updated metadata entry. |
| 301 | * @param int $object_id Post ID. |
| 302 | * @param string $meta_key Metadata key. |
| 303 | * @param mixed $meta_value Metadata value. This will be a PHP-serialized string representation of the value |
| 304 | * if the value is an array, an object, or itself a PHP-serialized string. |
| 305 | */ |
| 306 | do_action( 'updated_postmeta', $meta_id, $object_id, $meta_key, $meta_value ); |
| 307 | } |
| 308 | } |
| 309 | |
| 310 | return true; |
| 311 | } |
| 312 | |
| 313 | /** |
| 314 | * Deletes metadata for the specified object. |
| 315 | * |
| Line | Code |
| 872 | |
| 873 | // Clear the caches. |
| 874 | wp_cache_delete( $object_id, $meta_type . '_meta' ); |
| 875 | |
| 876 | /** This action is documented in wp-includes/meta.php */ |
| 877 | do_action( "updated_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value ); |
| 878 | |
| 879 | if ( 'post' === $meta_type ) { |
| 880 | /** This action is documented in wp-includes/meta.php */ |
| 881 | do_action( 'updated_postmeta', $meta_id, $object_id, $meta_key, $meta_value ); |
| 882 | } |
| 883 | |
| 884 | return true; |
| 885 | } |
| 886 | |
| 887 | // And if the meta was not found. |
| 888 | return false; |
| 889 | } |
| 890 | |