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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 |
|---|---|
| 294 | * |
| 295 | * @since 2.9.0 |
| 296 | * |
| 297 | * @param int $meta_id ID of updated metadata entry. |
| 298 | * @param int $object_id Post ID. |
| 299 | * @param string $meta_key Meta key. |
| 300 | * @param mixed $meta_value Meta value. This will be a PHP-serialized string representation of the value if |
| 301 | * the value is an array, an object, or itself a PHP-serialized string. |
| 302 | */ |
| 303 | do_action( 'updated_postmeta', $meta_id, $object_id, $meta_key, $meta_value ); |
| 304 | } |
| 305 | } |
| 306 | |
| 307 | return true; |
| 308 | } |
| 309 | |
| 310 | /** |
| 311 | * Delete metadata for the specified object. |
| 312 | * |
| Line | Code |
| 749 | |
| 750 | // Clear the caches. |
| 751 | wp_cache_delete( $object_id, $meta_type . '_meta' ); |
| 752 | |
| 753 | /** This action is documented in wp-includes/meta.php */ |
| 754 | do_action( "updated_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value ); |
| 755 | |
| 756 | if ( 'post' == $meta_type ) { |
| 757 | /** This action is documented in wp-includes/meta.php */ |
| 758 | do_action( 'updated_postmeta', $meta_id, $object_id, $meta_key, $meta_value ); |
| 759 | } |
| 760 | |
| 761 | return true; |
| 762 | } |
| 763 | |
| 764 | // And if the meta was not found. |
| 765 | return false; |
| 766 | } |
| 767 | |