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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 |
---|---|
914 | * The dynamic portion of the hook, `$meta_type`, refers to the meta |
915 | * object type (comment, post, term, or user). Returning a non-null value |
916 | * will effectively short-circuit the function. |
917 | * |
918 | * @since 5.0.0 |
919 | * |
920 | * @param mixed $check Whether to allow updating the meta cache of the given type. |
921 | * @param int[] $object_ids Array of object IDs to update the meta cache for. |
922 | */ |
923 | $check = apply_filters( "update_{$meta_type}_metadata_cache", null, $object_ids ); |
924 | if ( null !== $check ) { |
925 | return (bool) $check; |
926 | } |
927 |
|
928 | $cache_key = $meta_type . '_meta'; |
929 | $ids = array(); |
930 | $cache = array(); |
931 | foreach ( $object_ids as $id ) { |
932 | $cached_object = wp_cache_get( $id, $cache_key ); |