public function cascadeInvalidationTo(Tag $tag)
	{
		$this->cascade[] = $tag;

		// If this tag is already invalid, cascade it now
		if ($this->invalid)
		{
			$tag->invalidate();
		}
	}
public function cascadeInvalidationTo(Tag $tag)
	{
		$this->cascade[] = $tag;

		// If this tag is already invalid, cascade it now
		if ($this->invalid)
		{
			$tag->invalidate();
		}
	}
public function cascadeInvalidationTo ( Tag $ tag ) { $ this -> cascade [ ] = $ tag ; // If this tag is already invalid, cascade it now if ( $ this -> invalid ) { $ tag -> invalidate ( ) ; } }
Set given tag to be invalidated if this tag is invalidated

@param  Tag  $tag
@return void
Set given tag to be invalidated if this tag is invalidated