Function is question:
imagecopyresampled()

Problem:
arguments - srcX, srcY

Detail:
Running PHP with the php_gd2.dll extension, imagecopyresampled() failed to use the srcX and srcY arguments. It would always use (0,0) for the source (x,y) point, no matter if a variable (with a number) or a direct number was used in the function.

It becomes a problem when trying to make custom "closeup" thumbnails. Had to resort to imagecopyresized() which uses the arguments just fine.

Sample:

imagecopyresized($thumb, $temp, $dstX, $dstY, $srcX, $srcY, $dstW, $dstH, $srcW, $srcH);
imagepng($thumb);

/// You'll note that the srcX and srcY won't work properly, at least on my system. I used the binary zip download of PHP.