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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 |
|---|---|
| 1137 | * - `update_comment_metadata_cache` |
| 1138 | * - `update_term_metadata_cache` |
| 1139 | * - `update_user_metadata_cache` |
| 1140 | * |
| 1141 | * @since 5.0.0 |
| 1142 | * |
| 1143 | * @param mixed $check Whether to allow updating the meta cache of the given type. |
| 1144 | * @param int[] $object_ids Array of object IDs to update the meta cache for. |
| 1145 | */ |
| 1146 | $check = apply_filters( "update_{$meta_type}_metadata_cache", null, $object_ids ); |
| 1147 | if ( null !== $check ) { |
| 1148 | return (bool) $check; |
| 1149 | } |
| 1150 | |
| 1151 | $cache_key = $meta_type . '_meta'; |
| 1152 | $non_cached_ids = array(); |
| 1153 | $cache = array(); |
| 1154 | $cache_values = wp_cache_get_multiple( $object_ids, $cache_key ); |
| 1155 | |