For the sake of completeness, here is an example for imagechar. The base-image automatically adjusts to the size and the height of the given string. Using the rand()-function the y-position of each char is slightly varied with every loop-run. You can easily rewrite the script to use a randomly generated string - the one given here just serves as an example.<?php$string = '1 2 3 4 5 6 7 8 9 A B C D E F G';$font_size = 5;$width=imagefontwidth($font_size)*strlen($string);$height=imagefontheight($font_size)*2;$img = imagecreate($width,$height);$bg = imagecolorallocate($img,225,225,225);$black = imagecolorallocate($img,0,0,0);$len=strlen($string);for($i=0;$i<$len;$i++){ $xpos=$i*imagefontwidth($font_size); $ypos=rand(0,imagefontheight($font_size)); imagechar($img,$font_size,$xpos,$ypos,$string,$black); $string = substr($string,1); }header("Content-Type: image/gif");imagegif($img); imagedestroy($img);?>