Description:
------------
makes file but text is not there, nor some of border

my nearly identical codes work perfect for imagejpeg(), imagegif() and
 imagepng() and image wbmp()

why not imagexbm()????????????????

Test script:
---------------
<?php

header("Content-type: image/xbm");
$mytext = $_GET['mytext'];
$fontsize  = 5;
$wide  = imagefontwidth($fontsize) * strlen($mytext) + 20;
$high = imagefontheight($fontsize) + 20;
$picture = imagecreatetruecolor($wide,$high);
$gray = imagecolorallocate($picture,223,223,223);
$blue = imagecolorallocate($picture,0,0,255);
imagefill($picture,0,0,$gray);
$black=imagecolorallocate($picture, 0, 0, 0);
imageline($picture, 0, 0, 0, $high, $black);
imageline($picture, 0, 0, $wide, 0, $black);
imageline($picture, $wide-1, 0, $wide-1, $high-1, $black);
imageline($picture, 0, $high-1, $wide-1, $high-1, $black);
imagestring($picture,$fontsize,10,10,$mytext,$blue);
imagexbm($picture); //This function is only available if PHP is compiled with the bundled version of the GD library--is that the issue?
imagexbm($picture,"mytextpic.xbm");
imagedestroy($picture);

?>

Expected result:
----------------
bordered xbm image with text in it

Actual result:
--------------
makes file but text is not there, nor some of border either

I solved it! There are 2 huge errors on the page that describes the imagexbm() function and give examples. No one points out that the width MUST be evenly divisible by 8 or you get a mess. The example is 120 wide which just accidentally is evenly divisible by 8, which will happen only 1 in 8 times, randomly. This issue is dealt with in the code below. Also, since xbm is not color but black and white, the example should not be showing color anything, but it does. The code below is for black and white, and it works great. If there was a way, I'd erase the other stuff I wrote in this bug and put this comment here as a note on the imagexbm() page in PHP.NET!

<?php

header("Content-type: image/xbm");
$mytext = $_GET['mytext'];
$fontsize  = 5;
$wide  = imagefontwidth($fontsize) * strlen($mytext) + 20;
$temp1=$wide/8;
$temp2=round($wide/8);
if ($temp1<>$temp2){$wide=($temp2 * 8) + 8;}
$high = imagefontheight($fontsize) + 20;
$picture = imagecreatetruecolor($wide,$high);
$white = imagecolorallocate($picture,255,255,255);
imagefill($picture,0,0,$white);
$black=imagecolorallocate($picture, 0, 0, 0);
imageline($picture, 0, 0, 0, $high, $black);
imageline($picture, 0, 0, $wide, 0, $black);
imageline($picture, $wide-1, 0, $wide-1, $high-1, $black);
imageline($picture, 0, $high-1, $wide-1, $high-1, $black);
imagestring($picture,$fontsize,10,10,$mytext,$black);
imagexbm($picture); //This function is only available if PHP is compiled with the bundled version of the GD library
imagexbm($picture,"mytextpic.xbm");
imagedestroy($picture);

?>

Indeed, XBM images can have only two colors, so everything other
than the given $foreground color is treated as background.

I have also documented the limitation that the image width has to
be a multiple of 8, but actually this limitation can easily be
fixed without causing a real BC break.

I have filed a respective ticked against libgd[1]. Let's see what
they say.

[1] <https://github.com/libgd/libgd/issues/170>

Re-opening, because the issue has been fixed in libgd:
<https://github.com/libgd/libgd/commit/80ce084>.