[SOLVED] Dynamically changing script extension?

[Mirkules]

Hello all,

 

Quick question: say that I have a PHP file that generates an image using the GD libraries with a header content type set to image/png (or jpeg or whatever).

 

I have no problems displaying the image, but when a user attempts to download the image it has the extension .php. I would like the user to be able to save the file with a proper file extension (like image.jpeg).

 

Is there any way to do this? Ultimately, I also want to do this for text/plain and application/excel (this is the most important one).

 

Thanks in advance,

Mirkules

[brettpower]

Can you post the code that deals with the image upload/download?

[Mirkules]

Thanks for your reply.

 

There's not much to the code (assume the file is called image.php, and that the function imageSmoothCircle creates a smoothed circle):

$img = imageCreateTrueColor( 320, 240 );

imageSmoothCircle( $img, 160, 120, 100, array( 'R' => 0xCC, 'G' => 0x33, 'B' => 0x00 ) );
...
header( 'Content-Type: image/png' );
imagePNG( $img );
imagedestroy($img);

 

The question is how could I get the user to download this with a .png extension (for example) instead of the .php extension?

 

Thanks

[BlueSkyIS]

add a header that sends the file name, i think it's content-disposition.

[Mirkules]

Well, to reply to my own post, I finally figured it out (from php.net):

 

If you want the user to be prompted to save the data you are sending, such as a generated PDF file, you can use the » Content-Disposition header to supply a recommended filename and force the browser to display the save dialog.

<?php
// We'll be outputting a PDF
header('Content-type: application/pdf');

// It will be called downloaded.pdf
header('Content-Disposition: attachment; filename="downloaded.pdf"');

// The PDF source is in original.pdf
readfile('original.pdf');
?>

 

To apply this to my example above, it's impossible for the user to right-click on the image and save it as a .jpeg. BUT, if I wanted to push the image, or an excel document, or a text document to the browser's save as dialog, I could use the content-disposition header.

 

Mirkules.

[Mirkules]

One last note, you CAN control what the filename is when you right click on the image by omitting the attachment portion of the content-disposition.