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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 |
|---|---|
| 1033 | * The dynamic portion of the hook, `$meta_type`, refers to the meta object type |
| 1034 | * (post, comment, term, user, or any other type with an associated meta table). |
| 1035 | * Returning a non-null value will effectively short-circuit the function. |
| 1036 | * |
| 1037 | * @since 5.0.0 |
| 1038 | * |
| 1039 | * @param mixed $check Whether to allow updating the meta cache of the given type. |
| 1040 | * @param int[] $object_ids Array of object IDs to update the meta cache for. |
| 1041 | */ |
| 1042 | $check = apply_filters( "update_{$meta_type}_metadata_cache", null, $object_ids ); |
| 1043 | if ( null !== $check ) { |
| 1044 | return (bool) $check; |
| 1045 | } |
| 1046 | |
| 1047 | $cache_key = $meta_type . '_meta'; |
| 1048 | $non_cached_ids = array(); |
| 1049 | $cache = array(); |
| 1050 | $cache_values = wp_cache_get_multiple( $object_ids, $cache_key ); |
| 1051 | |