note 55824 deleted from ref.image by tularis

Note Submitter: Mark Rosenthal <mbr at arlsoft dot com> ---- In AmX's example of how to generate headers to prevent the browser from trying to cache a script-generated image, he wrote: "I did not yet find a way to get the filesize of a GD made image, so I assume you save it to disk, get the filesize and read it again." That's not necessary. Here's AmX's example, reworked to output the correct "Content-Length: " header without the intermediate step of storing the image in a file: // The following code assumes that $gd has been set to the GD // resource of the image we want to output. // Turn on output buffering ob_start(); // Output will now go to a buffer rather than the browser. imagejpeg($gd); header("Expires: Mon, 26 Jul 1997 05:00:00 GMT"); header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT"); header("Cache-Control: no-store, no-cache, must-revalidate"); header("Cache-Control: post-check=0, pre-check=0", false); header("Pragma: no-cache"); header("Content-type: image/jpeg"); // Tell the browser the number of bytes that have been // written to the buffer. header("Content-Length: " . ob_get_length()); // Now send the buffer's contents to the browser and turn off // output buffering. ob_end_flush(); // Remember to free the memory used by the GD resource, or the // sever will eventually crash. imagedestroy($gd); // Headers and image data have been sent. We're done. exit;