DedeCMS为文章图片自动添加ALT标签

//设置全局环境变量
$this->Fields['typename'] = $this->TypeLink->TypeInfos['typename'];
SetSysEnv($this->Fields['typeid'],$this->Fields['typename'],$this->Fields['aid'],$this->Fields['title'],'archives');

//替换图片Alt为文档关键字+标题
$this->Fields['body'] = str_ireplace(array('alt=""','alt=\'\''),'',$this->Fields['body']);
$this->Fields['body'] = preg_replace("@ [\s]{0,}alt[\s]{0,}=[\"'\s]{0,}[\s\S]{0,}[\"'\s] @isU"," ",$this->Fields['body']);
$this->Fields['body'] = str_ireplace("<img " ,"<img alt='".$this->Fields['keywords']." . ".$this->Fields['title']."' ",$this->Fields['body']);
//end