php大文件上传经典源码

function function_upload($name,$newname="",$dir="upload")
{
 global $_FILES,$ext;

 $return="";

 $time=time();

 $upload=trim($_FILES[$name]['tmp_name']);

 $upload_name=trim($_FILES[$name]['name']);

 $size=trim($_FILES[$name]['size']);

 if(empty($upload) or empty($upload_name) or $size==0)
 {
  return $return;
 }

 $dir.="/".date("Y-m",$time);

 if (is_uploaded_file($upload))
 {
  $ext=file_extension($upload_name);

  if(liu_mkdir($dir))
  {
   
   if($newname!="")
   {
    
    $newname.=".".$ext;
    //$newname=TIME_NOW.".".$ext;
   }else{
    //$newname=$upload_name;
    $newname=$time.".".$ext;
   }