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get_object_subtype

Returns the object subtype for a given object ID of a specific type.

get_registered_metadata

Retrieves registered metadata for a specified object.

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unregister_meta_key

Unregisters a meta key from the list of registered keys.

register_meta

Registers a meta key.

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is_protected_meta

Determines whether a meta key is considered protected.

_get_meta_table

Retrieves the name of the metadata table for the specified object type.

get_meta_sql

Given a meta query, generates SQL clauses to be appended to a main query.

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update_meta_cache

Updates the metadata cache for the specified objects.