function set_userdata($name, $value){
		if ($this->userdata === false)
			$this->userdata = array();

		$this->userdata[$name]=$value;
	}
function set_userdata($name, $value){
		if ($this->userdata === false)
			$this->userdata = array();

		$this->userdata[$name]=$value;
	}
function set_userdata ( $ name , $ value ) { if ( $ this -> userdata === false ) $ this -> userdata = array ( ) ; $ this -> userdata [ $ name ] = $ value ; }
set userdata for the item
set userdata for the item