Mine

#$startedCharacter = False;#$highestY = 10000;#$lowestY = 0;#$count = 0;#for($x=0;$x<$width;$x++)#{#        $hasBlack = False;#        for($y=0;$y<$height;$y++)#        {#                if(imagecolorat($captcha,$x,$y) == 0)#                {#                        $hasBlack = True;#                        if($y<$highestY){#                                $highestY = $y;#                        }#                        if($y>$lowestY){#                                $lowestY = $y;#                        }#                        $eax = $y;#                        if(!$startedCharacter)#                        {#                       #                                $data["x1"] = $x;#                                $data["y1"] = $y;#                                $startedCharacter = True;#                        }#                }#               #        }#       #        if(($startedCharacter) && (!$hasBlack))#        {#                $data["x2"] = $x;#                $data["y2"] = $eax;#                $newWidth = $data["x2"] - $data["x1"];#                $newHeight = $lowestY - $highestY;#                $croppedLetter = imagecreate($newWidth,$newHeight);#                imagecopy($croppedLetter,$captcha,0,0,$data["x1"],$highestY,$width,$newHeight);# #                $captchas[] = $croppedLetter;# #                imagepng($croppedLetter,"tmp-$count.png");# #                //imagerectangle($captcha,$data["x1"],$lowestY,$data["x2"],$highestY,"#FFFFFF");#                $startedCharacter = False;#                $highestY = 10000;#                $lowestY = 0;#                $count++;#        }# #}