//取原图地址
function GetFirstImg($arcid){ 
global $dsql; 
$query= "SELECT body FROM `dede_addonarticle` where aid='$arcid'"; 
$row = $dsql->GetOne($query); 
$preg = "/<img.*?src=[\'\"](.+?)[\'\"].*?>/i"; 
preg_match_all($preg, $row['body'], $match); 
//print_r($match); 
return $match[1][0]; 
} 

$row['litpic'] = $GLOBALS['cfg_mainsite'].$row['litpic'];

$row['big_pic']=GetFirstImg($row['id']);