php下载文件源代码(强制任意文件格式下载)

<?php
/**
 * 文件下载
 *
**/
header("Content-type:text/html;charset=utf-8");
download('web/magento-1.8.1.0.zip', 'magento下载'); 
function download($file, $down_name){
 $suffix = substr($file,strrpos($file,'.')); //获取文件后缀
 $down_name = $down_name.$suffix; //新文件名，就是下载后的名字

 //判断给定的文件存在与否
 if(!file_exists($file)){
  die("您要下载的文件已不存在，可能是被删除");
 }
 $fp = fopen($file,"r");
 $file_size = filesize($file);
 //下载文件需要用到的头
 header("Content-type: application/octet-stream");
 header("Accept-Ranges: bytes");
 header("Accept-Length:".$file_size);
 header("Content-Disposition: attachment; filename=".$down_name);
 $buffer = 1024;
 $file_count = 0;
 //向浏览器返回数据
 while(!feof($fp) && $file_count < $file_size){
  $file_con = fread($fp,$buffer);
  $file_count += $buffer;
  echo $file_con;
 }
 fclose($fp);
}
?>

/********************
*@file - path to file
*/
function force_download($file)
{
if ((isset($file))&&(file_exists($file))) {
header("Content-length: ".filesize($file));
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename="' . $file . '"');
readfile("$file");
} else {
echo "No file selected";
}
}

$file_name = "info_check.exe";
$file_dir = "/public/www/download/";
if (!file_exists($file_dir . $file_name)) { //检查文件是否存在
echo "文件找不到";
exit;
} else {
$file = fopen($file_dir . $file_name,"r"); // 打开文件
// 输入文件标签
Header("Content-type: application/octet-stream");
Header("Accept-Ranges: bytes");
Header("Accept-Length: ".filesize($file_dir . $file_name));
Header("Content-Disposition: attachment; filename=" . $file_name);
// 输出文件内容
echo fread($file,filesize($file_dir . $file_name));
fclose($file);
exit;
}

$file_name = "info_check.exe";
$file_dir = "http://www.uoften.com/";
$file = @ fopen($file_dir . $file_name,"r");
if (!$file) {
echo "文件找不到";
} else {
Header("Content-type: application/octet-stream");
Header("Content-Disposition: attachment; filename=" . $file_name);
while (!feof ($file)) {
echo fread($file,50000);
}
fclose ($file);
}

   public function downloadAction()
    {
        if (isset($_GET['mriID']))
    {
    $this->view->mriID=(get_magic_quotes_gpc())?$_GET['mriID']:addslashes($_GET['mriID']);
    }
        if (isset($_GET['dicomID']))
    {
    $this->view->dicomID=(get_magic_quotes_gpc())?$_GET['dicomID']:addslashes($_GET['dicomID']);
    }
       if (isset($_GET['JPGID']))
    {
    $this->view->JPGID=(get_magic_quotes_gpc())?$_GET['JPGID']:addslashes($_GET['JPGID']);
    }
    $dicomfile=new dicomfile();
    $jpgfile=new jpgfile();
    $mri=new mri();
    if($this->view->dicomID)
    {
    $filename=$dicomfile->find($this->view->dicomID)->toArray();
    $filename=$filename[0]['filename'];
    }  
    else if($this->view->JPGID)
    {
      $filename=$jpgfile->find($this->view->JPGID)->toArray();
      $filename=$filename[0]['JPGname'];
    }
    $dir=$mri->find($this->view->mriID)->toArray();
    $dir=$dir[0]['dicom_path'];
    $file=$dir.'/'.$filename;
    if (!file_exists($file))
    {
    echo "the file does not exist!";
    exit();
    }
      $file_size=filesize($file);
           header("Content-type: application/octet-stream");
           header("Accept-Ranges: bytes");
           header("Accept-Length:". $file_size);
           header("Content-Disposition: attachment; filename=".$filename);
           $fp=fopen($file,"r");
      if (!$fp)
    echo "can't open file!";
       $buffer_size=1024;
    $cur_pos=0;
    while (!feof($fp)&&$file_size-$cur_pos>$buffer_size)
    {
    $buffer=fread($fp,$buffer_size);
    echo $buffer;
    $cur_pos+=$buffer_size;
        }
    $buffer=fread($fp,$file_size-$cur_pos);
    echo $buffer;
    fclose($fp); 
    }