如何在PHP中将会话存储的文件内容打印为八位字节流？

Question

I have issue with printing session saved image data back in Drupal CMS. The result page get 6 bytes content not my uploaded image data.

The image storing code is :

// Read content of the uploaded file
$file_content = file_get_contents($_FILES["image_field"]["tmp_name"]);
// Strore the file in the session
$_SESSION['session_image'] = $file_content;

Then in another page, I'm printing the session stored data. The code :

// Set content type - octet-stream
header("Content-type: application/octet-stream");
// Print the session stored image back
echo $_SESSION['session_image'];
// Exit
exit;

I don't want to do the followings as a solution:

1. Store the uploaded file in temporary location and serve it.
2. Change the content type to another

What I want is to print the uploaded file content as it is to the browser (as a octet stream). I really appreciate if any one can help on this.

Updated Code :

// Read content of the uploaded file
$file_content = file_get_contents($_FILES["image_field"]["tmp_name"]);
// Strore the file in the session
$_SESSION['session_image'] = base64_encode($file_content);

---

// Modified to have base64 encoded content to store so decode it here
$content = base64_decode($_SESSION['session_image']);
header("Content-Transfer-Encoding: binary");
header("Content-Length: ". mb_strlen($content, 'latin1'));
// Set content type - octet-stream
header("Content-type: application/octet-stream");
// Print content
echo $content;
exit;

But still the image content is not visible. Some of the characters of the image content are converted into other when uploaded image content and the original image content compared.

Answer 1

Try adding those:

header("Content-Transfer-Encoding: binary"); 
header("Content-Length: ". mb_strlen($_SESSION['session_image'], 'latin1'));