PHP上传文件

if($_POST['Submit']!=""){//文件上传
        //print_r($_POST);
    if ($_FILES['textfield']['tmp_name'] == "")
        {
        echo"No File!!";
        exit;
        }
        //$title=
        $title_name = $_COOKIE['cp_bianhao'];
        $dir=ABS_ROOT."M_CPSJ/attachments/";
        $dh = opendir($dir);
        while (false !== ($filename = readdir($dh))) {
            $files[] = $filename;
        }
        sort($files);
        foreach($files as $value){
            $value_arr=explode("|",$value);
            if($title_name==$value_arr[0]){
                unlink($dir.$value);
            }    
        }
        $file_name = ABS_ROOT."M_CPSJ/attachments/".$_COOKIE['cp_bianhao']."|".$_FILES['textfield']['name'];
        $result=move_uploaded_file($_FILES['textfield']['tmp_name'] , $file_name);
        chmod($file_name,0777);
        if(!$result){
            print_r($_FILES);
        }
        $sql="UPDATE `cpsj_cpda` SET `appendix_path` = '".ABS_ROOT."M_CPSJ/attachments/"."',
`appendix_name` = '".$_COOKIE['cp_bianhao']."|".$_FILES['textfield']['name']."' WHERE `cp_bianhao` ='".$title_name."' ";
        //echo $sql;
        $result=$db_con->db_query($sql);
        if($_COOKIE['sn']!=""){
            Header("Location:cpda_cx.php");
            setcookie("cp_bianhao","",time()-60*60*24*365);
            setcookie("number","",time()-60*60*24*365);
            setcookie("sn","",time()-60*60*24*365);
        }
}

自己的笔记！！！