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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.
| Line | Code |
|---|---|
| 65 | 'meta_key' => $meta_key, |
| 66 | 'meta_value' => $meta_value |
| 67 | ) ); |
| 68 | |
| 69 | wp_cache_delete($object_id, $meta_type . '_meta'); |
| 70 | // users cache stores usermeta that must be cleared. |
| 71 | if ( 'user' == $meta_type ) |
| 72 | clean_user_cache($object_id); |
| 73 | |
| 74 | do_action( "added_{$meta_type}_meta", $wpdb->insert_id, $object_id, $meta_key, $_meta_value ); |
| 75 | |
| 76 | return true; |
| 77 | } |
| 78 | |
| 79 | /** |
| 80 | * Update metadata for the specified object. If no value already exists for the specified object |
| 81 | * ID and metadata key, the metadata will be added. |
| 82 | * |
| 83 | * @since 2.9.0 |