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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 |
|---|---|
| 902 | * The dynamic portion of the hook, `$meta_type`, refers to the meta |
| 903 | * object type (comment, post, term, or user). Returning a non-null value |
| 904 | * will effectively short-circuit the function. |
| 905 | * |
| 906 | * @since 5.0.0 |
| 907 | * |
| 908 | * @param mixed $check Whether to allow updating the meta cache of the given type. |
| 909 | * @param array $object_ids Array of object IDs to update the meta cache for. |
| 910 | */ |
| 911 | $check = apply_filters( "update_{$meta_type}_metadata_cache", null, $object_ids ); |
| 912 | if ( null !== $check ) { |
| 913 | return (bool) $check; |
| 914 | } |
| 915 | |
| 916 | $cache_key = $meta_type . '_meta'; |
| 917 | $ids = array(); |
| 918 | $cache = array(); |
| 919 | foreach ( $object_ids as $id ) { |
| 920 | $cached_object = wp_cache_get( $id, $cache_key ); |