function download($file_path,$file_name){

$file_name = iconv("UTF-8","GB2312",$file_name);

$file = $file_path.$file_name;

if(!file_exists($file)){

echo "该文件不存在";

die();

}

$filesize = filesize($file);

$fp = fopen($file,"r");

//返回的文件

header("Content-type: application/octet-stream");

//按照字节大小返回

header("Accept-Ranges: bytes");

//返回文件大小

header("Accept-Length: $filesize");

//这里客户端的弹出对话框，对应的文件名

header("Content-Disposition: attachment; filename=".$file_name);

$buffer = 1024;

$count = 0;

while(!feof($fp) || ($count< $filesize)){

$data = fread($fp,$buffer);

$count+=$buffer;

echo $data;

}

fclose($fp);

}