Need help with PHP GD imagesetpixel()

$imageurl = "kaptka.gif";
$im = imagecreatefromgif($imageurl);
$b = imagecolorallocate($im, 0, 0, 0);
imagesetpixel($im, 5, 5, $b);

header('Content-Type: image/gif');
imagegif($开发者_如何学JAVAim, "asd.gif");

kaptka.gif is normal gif image. I want to draw some pixels anywhere on the image. Asd.gif looks normal, but when i open the file it should show me both like asd.gif, but it shows just "IMAGE" text.

You are calling the function imagegif() with a filename. This will write the image to disc. To display the contents, simply call it without the filename: this will pass the contents to the output stream, which means it will be sent to the client's browser. One way to do both is to call it twice, once to save the file, and once to display it.

When saving the file, you can assign the result to a variable $foo=imagegif($im, 'bar.gif') and then check the result to see if the save was successful. A FALSE means it failed.

You say the image saved to the server is OK, so the reason you are getting an "IMAGE text" in your browser is probably because you are sending a PNG header, but no data (because of the way you called imagefig()).