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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 |
|---|---|
| 143 | |
| 144 | do_action( "update_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value ); |
| 145 | |
| 146 | $wpdb->update( $table, $data, $where ); |
| 147 | wp_cache_delete($object_id, $meta_type . '_meta'); |
| 148 | // users cache stores usermeta that must be cleared. |
| 149 | if ( 'user' == $meta_type ) |
| 150 | clean_user_cache($object_id); |
| 151 | |
| 152 | do_action( "updated_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value ); |
| 153 | |
| 154 | return true; |
| 155 | } |
| 156 | |
| 157 | /** |
| 158 | * Delete metadata for the specified object. |
| 159 | * |
| 160 | * @since 2.9.0 |
| 161 | * @uses $wpdb WordPress database object for queries. |