织梦DEDECMS扩展标签怎么用

if(!defined('DEDEINC')) 
{ 
exit("Request Error!"); 
} 
function lib_demotag(&$ctag,&$refObj) 
{ 
global $dsql,$envs; 
 
$attlist="row|12,titlelen|24"; 
FillAttsDefault($ctag->CAttribute->Items,$attlist); 
extract($ctag->CAttribute->Items, EXTR_SKIP); 
$revalue = ''; 
 
//------------------------------------------------------ 
$revalue = 'Hello Word!'; 
//------------------------------------------------------ 
return $revalue; 
} 
?>