


PHP download file source code (force download of any file format)_PHP tutorial
A simple php file downloads the source code. Although it does not support breakpoint resumption, etc., it can meet some common needs. PHP downloading files can actually be achieved with an a tag, such as magento-1.8.1.0.zip. But if you encounter some formats that the browser can recognize, such as .txt, .html, .pdf, etc., then use abc.txt I guess you know what will happen. What's up.
/**
* 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; //New file name, It’s the name after downloading
//Judge 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);
//Headers needed to download files
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 $file_con = fread($fp,$buffer);
$file_count += $buffer;
echo $file_con;
}
fclose($fp) ;
}
?>
Source code for PHP mandatory file download
Provide 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";
}
}
You will definitely laugh at me. Is it worth saying that "downloading files" 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 . $file_name,"r"); // Open the file
// Enter the file tag
Header("Content-type: application/octet-stream");
Header("Accept-Ranges: bytes");
Header("Accept-Length: ".filesize($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;
}
If the file path is an "http" or "ftp" URL, the source code will change slightly. The procedure is as follows:
$file_name = "info_check.exe";
$file_dir = "http: //www.jb51.net/";
$file = @ fopen($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);
}
In 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']);
}
$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);
}
At this point, the download.phtml page must be completely blank. MUST NOT have any content (including static information like:

Reasons for PHPSession failure include configuration errors, cookie issues, and session expiration. 1. Configuration error: Check and set the correct session.save_path. 2.Cookie problem: Make sure the cookie is set correctly. 3.Session expires: Adjust session.gc_maxlifetime value to extend session time.

Methods to debug session problems in PHP include: 1. Check whether the session is started correctly; 2. Verify the delivery of the session ID; 3. Check the storage and reading of session data; 4. Check the server configuration. By outputting session ID and data, viewing session file content, etc., you can effectively diagnose and solve session-related problems.

Multiple calls to session_start() will result in warning messages and possible data overwrites. 1) PHP will issue a warning, prompting that the session has been started. 2) It may cause unexpected overwriting of session data. 3) Use session_status() to check the session status to avoid repeated calls.

Configuring the session lifecycle in PHP can be achieved by setting session.gc_maxlifetime and session.cookie_lifetime. 1) session.gc_maxlifetime controls the survival time of server-side session data, 2) session.cookie_lifetime controls the life cycle of client cookies. When set to 0, the cookie expires when the browser is closed.

The main advantages of using database storage sessions include persistence, scalability, and security. 1. Persistence: Even if the server restarts, the session data can remain unchanged. 2. Scalability: Applicable to distributed systems, ensuring that session data is synchronized between multiple servers. 3. Security: The database provides encrypted storage to protect sensitive information.

Implementing custom session processing in PHP can be done by implementing the SessionHandlerInterface interface. The specific steps include: 1) Creating a class that implements SessionHandlerInterface, such as CustomSessionHandler; 2) Rewriting methods in the interface (such as open, close, read, write, destroy, gc) to define the life cycle and storage method of session data; 3) Register a custom session processor in a PHP script and start the session. This allows data to be stored in media such as MySQL and Redis to improve performance, security and scalability.

SessionID is a mechanism used in web applications to track user session status. 1. It is a randomly generated string used to maintain user's identity information during multiple interactions between the user and the server. 2. The server generates and sends it to the client through cookies or URL parameters to help identify and associate these requests in multiple requests of the user. 3. Generation usually uses random algorithms to ensure uniqueness and unpredictability. 4. In actual development, in-memory databases such as Redis can be used to store session data to improve performance and security.

Managing sessions in stateless environments such as APIs can be achieved by using JWT or cookies. 1. JWT is suitable for statelessness and scalability, but it is large in size when it comes to big data. 2.Cookies are more traditional and easy to implement, but they need to be configured with caution to ensure security.


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