Checks if a meta key is registered.

Parameters

$object_typestringrequired

Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user', or any other object type with an associated meta table.

$meta_keystringrequired

Metadata key.

$object_subtypestringoptional

The subtype of the object type.

Default:''

Return

Source

function registered_meta_key_exists( $object_type, $meta_key, $object_subtype = '' ) {
	$meta_keys = get_registered_meta_keys( $object_type, $object_subtype );

	return isset( $meta_keys[ $meta_key ] );
}

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