A convenient simple php file upload class

Previously used the above file upload class, found that there are many inconvenient places.

Now I have to do a new one, everyone help me review, is there any deficiencies.

<?php
/*
* File Upload Class
* Author: More than a rookie
* Contact Email: KINGERQ at MSN DOT com
* Date Created: 2005-06-11
SourceHttp://blog.csdn.net/kingerq
*
Instance
?
$f = new Upfile ("./soft/", "gif,jpg,png");
Upload single or multiple file names with the same file name
if (Isset ($_files["FILES"]) {
if ($f->upload ("files")) {
echo "File upload succeeded."
}
}
Upload multiple different file domain name file
if (Isset ($_files) {
foreach ($_files as $key => $val)
if ($f->upload ($key)) {
echo "File upload succeeded."
}
}
?>
*/
Class upfile{
Uploading file information
var $filename;
Save Name
var $savename;
Save path
var $savepath;
File format Limited, empty without restriction formatting
var $format = "";
Overlay mode
var $overwrite = 0;
/* $overwrite = 0 o'clock do not overwrite file with same name
* $overwrite = 1 o'clock overwrite file with same name
*/
File Maximum bytes
var $maxsize = 210000000;
File name extension
var $ext;
Error code
var $errno = 0;

/* Constructor
* $path Save Path
* $format file format (separated by commas)
* Maximum $maxsize file limit
* $over covering parameters
*/
function Upfile ($path, $format = "", $maxsize = 0, $over = 0) {
$this->savepath = substr ($path,-1) = = "/"? $path: $path. " /";//save path
$this->overwrite = $over;//whether to cover the same name file
$this->maxsize = $maxsize? $this->maxsize: $maxsize;//File Maximum byte
$this->format = $format;
}

/*
* Function: Detect and organize files
* $form file Domain name
* $file upload file to save the name, empty or upload multiple files by the system automatically generated name
*/
function upload ($form, $file = "") {
if (!isset ($_files[$form])) {
$this->halt ("The specified file domain name does not exist.) ");
}else{
$filear = $_files[$form];
}

if (!is_writable ($this->savepath)) {
$this->halt ("The specified path is not writable.) ");
}

if (Is_array ($filear ["name"])) {//upload the same file domain name multiple files
for ($i = 0; $i < count ($filear [name]); $i + +) {
$ar ["name"] = $filear ["name"] [$i];
$ar ["tmp_name"] = $filear ["Tmp_name"] [$i];
$ar ["size"] = $filear ["Size"] [$i];
$ar ["error"] = $filear ["Error"] [$i];

$this->getext ($ar ["name"]);//Get extension
$this->set_savename ();//Set Save file name
$this->copyfile ($ar);
}
}else{//Upload a single file
$this->getext ($filear ["name"]);//Get extension
$this->set_savename ($file);//Set Save file name
$this->copyfile ($filear);
}
return true;
}

/*
* Function: Detect and copy uploaded files
* $filear upload file Data array
*/
function CopyFile ($filear) {

if ($filear [size] > $this->maxsize) {
$this->halt ("Upload file". $filear ["name"]. "The size exceeds the system-qualified value [". $this->maxsize. "bytes], cannot be uploaded. ");
}

if (! $this->overwrite && file_exists ($this->savename)) {
$this->halt ($this->savename.) file name already exists. ");
}

if ($this->format!= "" "&&!in_array (Strtolower ($this->ext), Explode (", ", Strtolower ($this->format)) )){
$this->halt ($this->ext. "File format is not allowed to upload. ");
}

if (!copy ($filear ["Tmp_name"], $this->savepath. $this->savename)) {
$errors = Array (0=> "file upload succeeded",
1=> "The uploaded file exceeds the value of the Upload_max_filesize option limit in php.ini. ",
2=> "The size of the upload file exceeds the value specified by the Max_file_size option in the HTML form. ",
3=> "file is only partially uploaded. ",
4=> "No files were uploaded. ");
$this->halt ($errors [$filear ["Error"]]);
}else{
@unlink ($filear ["Tmp_name"]);//Delete temporary files
}
}

/*
* Function: Get the file name extension
* $filename for file name
*/
function Getext ($filename) {
if ($filename = = "") return;

$ext = Explode (".", $filename);

$this->ext = $ext [1];
}

/*
* Function: Set File Save name
* $savename save name, if empty, the system automatically generates a random file name
*/
function Set_savename ($savename = "")
{
if ($savename = = "")//If no filename is set, a random filename is generated
{
Srand (Double) microtime () * 1000000);
$rnd = rand (100,999);
$name = Date (' U ') + $rnd;
$name = $name. ". $this->ext;
} else {
$name = $savename;
}
$this->savename = $name;
}

/*
* Function: Error hint
* $msg for output information
*/
function Halt ($msg) {
echo "<strong> attention:</strong>". $msg;
Exit
}
}
?>