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function is not described

get_registered_meta_keys() WP 4.6.0

Retrieves a list of registered meta keys for an object type.

No Hooks.

Return

String[]. List of registered meta keys.

Usage

get_registered_meta_keys( $object_type, $object_subtype );
$object_type(string) (required)
Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user', or any other object type with an associated meta table.
$object_subtype(string)
The subtype of the object type.
Default: ''

Changelog

Since 4.6.0 Introduced.
Since 4.9.8 The $object_subtype parameter was added.

Code of get_registered_meta_keys() WP 5.8.1

function get_registered_meta_keys( $object_type, $object_subtype = '' ) {
	global $wp_meta_keys;

	if ( ! is_array( $wp_meta_keys ) || ! isset( $wp_meta_keys[ $object_type ] ) || ! isset( $wp_meta_keys[ $object_type ][ $object_subtype ] ) ) {
		return array();
	}

	return $wp_meta_keys[ $object_type ][ $object_subtype ];
}