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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 |
|---|---|
| 341 | * |
| 342 | * @since 2.9.0 |
| 343 | * |
| 344 | * @param int $meta_id ID of updated metadata entry. |
| 345 | * @param int $object_id Post ID. |
| 346 | * @param string $meta_key Metadata key. |
| 347 | * @param mixed $meta_value Metadata value. This will be a PHP-serialized string representation of the value |
| 348 | * if the value is an array, an object, or itself a PHP-serialized string. |
| 349 | */ |
| 350 | do_action( 'updated_postmeta', $meta_id, $object_id, $meta_key, $meta_value ); |
| 351 | } |
| 352 | } |
| 353 | |
| 354 | return true; |
| 355 | } |
| 356 | |
| 357 | /** |
| 358 | * Deletes metadata for the specified object. |
| 359 | * |
| Line | Code |
| 954 | |
| 955 | // Clear the caches. |
| 956 | wp_cache_delete( $object_id, $meta_type . '_meta' ); |
| 957 | |
| 958 | /** This action is documented in wp-includes/meta.php */ |
| 959 | do_action( "updated_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value ); |
| 960 | |
| 961 | if ( 'post' === $meta_type ) { |
| 962 | /** This action is documented in wp-includes/meta.php */ |
| 963 | do_action( 'updated_postmeta', $meta_id, $object_id, $meta_key, $meta_value ); |
| 964 | } |
| 965 | |
| 966 | return true; |
| 967 | } |
| 968 | |
| 969 | // And if the meta was not found. |
| 970 | return false; |
| 971 | } |
| 972 | |