PHP 上传文件的方法（类）

/** 
* 图片上传方法 
* $maxsize=500000 = 500k; 
* $updir="up/"; 
* $upfile=$_FILES["file_img"]; 
*/ 
public function Get_file_upload($upfile, $maxsize, $updir, $newname = 'date') { 
if ($newname == 'date') 
$newname = date("Ymdhs"); //使用日期做文件名 
$name = $upfile["name"]; 
$type = $upfile["type"]; 
$size = $upfile["size"]; 
$tmp_name = $upfile["tmp_name"]; 
switch ($type) { 
case 'image/pjpeg' : 
case 'image/jpeg' : 
$extend = ".jpg"; 
break; 
case 'image/gif' : 
$extend = ".gif"; 
break; 
case 'image/png' : 
$extend = ".png"; 
break; 
} 
if (empty ($extend)) { 
echo '文件类型不正确,只能使用JPG GIF PNG 格式'; 
} 
if ($size > $maxsize) { 
$maxpr = $maxsize / 1000; 
echo "警告！上传图片大小不能超过"; 
} 
if (move_uploaded_file($tmp_name, $updir . $newname . $extend)) { 
return $newname . $extend; 
} 
}