public function setGroups($groups=null) {
		if(!is_array($groups) && $groups !== null)
			$groups = [$groups];
		$this->groups = $groups;
		return $this;
	}
public function setGroups($groups=null) {
		if(!is_array($groups) && $groups !== null)
			$groups = [$groups];
		$this->groups = $groups;
		return $this;
	}
public function setGroups ( $ groups = null ) { if ( ! is_array ( $ groups ) && $ groups !== null ) $ groups = [ $ groups ] ; $ this -> groups = $ groups ; return $ this ; }
Set the groups.
@param array|string|null $groups
Set the groups .