PHP download file forces any file format to be downloaded-PHP Tutorial-php.cn

PHP download file forces any file format to be downloaded

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Release： 2016-07-25 09:12:36

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Using PHP to download some files is generally necessary to hide the real download address of the file. Otherwise, it will increase the load on the server. It is better to provide the address of the software directly.

A simple php file downloads the source code. Although it does not support breakpoint resumption, etc., it can meet some common needs. PHP download files can actually be achieved with an a tag, such as magento-1.8.1.0.zip. But when you encounter some formats that the browser can recognize, such as .txt, .html, .pdf, etc., you must know what will happen if you use abc.txt again.

/**
* File download
*
**/
header("Content-type:text/html;charset=utf-8");
download('web/magento-1.8.1.0.zip ', 'magento download');
function download($file, $down_name){
$suffix = substr($file,strrpos($file,'.')); //Get the file suffix
$down_name = $down_name .$suffix; //The new file name is the name after downloading
//Determine whether the given file exists
if(!file_exists($file)){
die("The file you want to download no longer exists, It may have been deleted");
}
$fp = fopen($file,"r");
$file_size = filesize($file);
//The header needed to download the file
header("Content-type : application/octet-stream");
header("Accept-Ranges: bytes");
header("Accept-Length:".$file_size);
header("Content-Disposition: attachment; filename=".$ down_name);
$buffer = 1024;
$file_count = 0;
//Return data to the browser
while(!feof($fp) && $file_count < $file_size){
$file_con = fread($fp, $buffer);
$file_count += $buffer;
echo $file_con;
} www.jbxue.com
fclose($fp);
}
?>

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Source code for PHP mandatory file download

Provides users with mandatory file download functionality.

/********************
*@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";
}
}

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You will definitely laugh at me. Is it worth saying that "downloading a file" is so simple? Of course it's not as simple as imagined. For example, if you want customers to fill out a form before they can download a certain file, your first idea must be to use the "Redirect" method. First check whether the form has been filled in and complete, and then point the URL to the file. , so that customers can download it, but if you want to make an e-commerce website about "online shopping" and consider security issues, you don't want users to directly copy the URL to download the file. The author recommends that you use PHP to directly read the actual file and then download it. method to do it. The procedure is as follows:

$file_name = "info_check.exe";
$file_dir = "/public/www/download/";
if (!file_exists($file_dir . $file_name)) { //Check whether the file exists
echo " File not found";
exit;
} else {
$file = fopen($file_dir . $file_name,"r"); // Open the file
// Enter the file tag www.jbxue.com
Header("Content -type: application/octet-stream");
Header("Accept-Ranges: bytes");
Header("Accept-Length: ".filesize($file_dir . $file_name));
Header("Content-Disposition : attachment; filename=" . $file_name);
// Output file content
echo fread($file,filesize($file_dir . $file_name));
fclose($file);
exit;
}

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If the file path is "http" or "ftp" URL, the source code will be slightly changed. The procedure is as follows:

$file_name = "info_check.exe";
$file_dir = "http://www.jbxue.com/";
$file = @ fopen($file_dir . $file_name,"r");
if (!$file) {
echo "File not found";
} else {
Header("Content-type: application/octet-stream");
Header("Content-Disposition: attachment; filename=" . $ file_name);
while (!feof ($file)) {
echo fread($file,50000);
}
fclose ($file);
}

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This way you can directly output the file using PHP.

However, be sure to note: Header information is equivalent to first browsing the file information at high speed, and then downloading the information on the browser to the attachment. Therefore, if you are in an MVC-mode application, the view page must not have any content. Otherwise, the relevant content of the view page will be downloaded together with the content of the file, resulting in the downloaded file being unusable.
Here is my program:

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']);
} www.jbxue.com
$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);
}