PHP-Download doesn't work properly
Question
I want to dowload as a web-client a photo from my webserver with PHP.
Therefore, I've written the following PHP-Script:
header('Content-Description: File Transfer');
header('Content-Type: image/jpg');
header('Content-Disposition: attachment; filename='.$filename);
header('Content-Transfer-Encoding: binary');
header('Expires: 0');
header('Cache-Control: must-revalidate');
header('Pragma: public');
header('Content-Length: ' . filesize($filename));
readfile("/var/www/_old/pictures/".$filename);
( $filename is the name of the file, like screenshot_03.06.2016-19:36:50.jpg )
The problem is, the content of this downloaded image is not the image itself, it's the code from the current website. The download works fine, but I cannot open the image properly ...
1 answers
solution1
0 ACCPTED 2016-06-05 09:27:33
OK.
After some time, I found a working solution.
My problem was, that I wrote the header-commands AFTER some output. According to the php documentation, this is forbidden.
So all I did is this, I created a new .php-file and checked if the session (in which I previously stored the needed information - filename and download-command) was set correct. On the previous page, I received the POST-information, stored it into the session and redirected (also with header-command) to the newly created php-file.
Then I wrote these header-commands:
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename="'.basename($filename).'"');
readfile($filename);
And now, the download works from all browsers (also IE!).
Here is all my code, I hope this could help someone:
1st page (where I receive the POST-infos):
session_start();
...
...
if(isset($_POST["galerie_submitBt"])){
if($_POST["galerie_submitBt"] === "Herunterladen") { //Das Herunterladen muss in einer eigenen Datei passieren, bevor jeglichen Outputs
$_SESSION["download_Screenshot"] = true;
$_SESSION["filename"] = "/var/www/_old/pictures/".$_POST["filename"];
header("Location:modules/php/download_Screenshot.php");
}
}
?>
<!DOCTYPE html>
<html>
<head>
<title>...
2nd, new created php-page (where I actually download the image):
session_start();
if(isset($_SESSION["download_Screenshot"])){
if(isset($_SESSION["filename"]) && file_exists($_SESSION["filename"])) {
$filename = $_SESSION["filename"]; //Filename also includes the path! (absolute path)
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename="'.basename($filename).'"');
readfile($filename);
unset($_SESSION["filename"]);
unset($_SESSION["download_Screenshot"]);
}
}
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.