Get the child optional elements for the given element type.
public getChildOptionalElements ( ElementType $parent_type ) : BaseEventTypeElement[] | ||
$parent_type | ElementType | |
리턴 | BaseEventTypeElement[] | $optional_elements |
public getChildOptionalElements ( ElementType $parent_type ) : BaseEventTypeElement[] | ||
$parent_type | ElementType | |
리턴 | BaseEventTypeElement[] | $optional_elements |