PHP上传文件例子

if($_POST['Submit']!=""){//文件上传
    if ($_FILES['textfield']['tmp_name'] == ""){
        echo"No File!!";
        exit;
    } 
    $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);*nux下才需要
    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."' ";
    $result=$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);
    }
}