Problem PHP in Yet Another Photoblog causes “Warning: Division by zero in exifReader.inc on line 859” (the problem line is in bold):   case TAG_SHUTTERSPEED:   // More complicated way of expressing exposure time, so only use   // this value if we don’t already have it from somewhere else.   if ($this->ImageInfo[TAG_EXPOSURETIME] == 0){     $sp = $this->ConvertAnyFormat($ValuePtr, $Format);   …