phpcms前端页面上传文件的实现方法

public function upload() {
$grouplist = getcache('grouplist','member'); //获取缓存中身份分组的列表
if($this->isadmin==0 && !$grouplist[$this->groupid]['allowattachment']) return false; //判断是否允许上传附件
pc_base::load_sys_class('attachment','',0); //加载attachment类
$module = trim($_GET['module']); //通过get方式获取模型
$catid = intval($_GET['catid']); //通过get方式获取catid
$siteid = $this->get_siteid(); //获取站点ID
$site_setting = get_site_setting($siteid); //获取站点配置信息，这个函数在此模块中的公共函数global.func.php中可以找到
$site_allowext = $site_setting['upload_allowext']; //获取到允许的上传文件类型
$attachment = new attachment($module,$catid,$siteid); //实例化attachment类，就是上面刚刚提到的加载进来的类
$attachment->set_userid($this->userid); //调用attachment类的set_userid函数，确定是哪个用户上传的。
$a = $attachment->upload('upload',$site_allowext); //上传文件，具体的函数请查看attachment类。
if($a){ //下面这些就是上传成功后的一些路径和文件名什么的了~
$filepath = $attachment->uploadedfiles[0]['filepath'];
$fn = intval($_GET['CKEditorFuncNum']);
$this->upload_json($a[0],$filepath,$attachment->uploadedfiles[0]['filename']);
$attachment->mkhtml($fn,$this->upload_url.$filepath,'');
}
}

<form method="post" enctype="multipart/form-data" action="/index.php?m=attachment&c=attachments&a=upload" id="uploadload" target="iframelogo">
<input type="file" class="uploadtxt" name="upload" /><input type="submit" value="dianji" />
</form>

<input type=file name="upload">