WordPress Code Reference

is_protected_meta

Summery Summery

Filters whether a meta key is considered protected.

apply_filters( 'is_protected_meta', bool $protected, string $meta_key, string $meta_type )

$protected: Whether the key is considered protected.
$meta_key: Metadata key.
$meta_type: Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user', or any other object type with an associated meta table.

Changelog
Version	Description
3.2.0	Introduced.