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Metadata (category)

add_metadata()

Add metadata (an additional data) for the specified object (a post, a comment, a user etc).

delete_metadata()

Delete metadata for the specified object.

get_metadata()

Retrieve metadata for the specified object.

is_protected_meta()

Determine whether a meta key is protected.

register_meta()

Registers a meta key.

sanitize_meta()

Sanitize meta value.

update_metadata()

Update metadata for the specified object. If no value already exists for the specified object ID and metadata key, the metadata will be added.