<?php  



# Created by Up  



session_start();  



$_SESSION['code']=(string)substr(str_shuffle ('QWERTYUIPASDFGHJKLZXCVBNM123456789'),rand(0,30),4);  



$thiz=ImageCreate(72,30); // Размер изображения  



imagecolortransparent($thiz,imagecolorallocate ($thiz,0xff,0xff,0xff)); // Прозрачный фон  



function imagekub($thiz,$size,$i1,$niz1,$chr=NULL) { $color1=imagecolorallocate($thiz,($l1=rand (150,200)),($l2=rand(150,200)),($l3=rand(150,200)));  



$color2=imagecolorallocate($thiz,($l1-50),($l2-50),($l3-50));  



$color3=imagecolorallocate($thiz,($l1-100), ($l2-100),($l3-100));  



$color4=imagecolorallocate($thiz,($l1+55), ($l2+55),($l3+55));  



$niz3=$niz1;  



$niz2=($niz1+($b=(12+$size)));  



$i2=$i1+(12+$size);  



do { imageline($thiz,$i2, (++$niz3),$i1,$niz3,$color2); --$b;  



}  



while($b>1);  



imageline($thiz,$i2,$niz1,$i1,$niz1,$color1);  



imageline($thiz,$i1,$niz2,$i1,$niz1,$color1);  



imageline($thiz,$i2,$niz1,$i2,$niz2,$color3);  



imageline($thiz,$i2,$niz2,$i1,$niz2,$color3);  



if($chr!==NULL) { imagechar($thiz,$size,$i1+5,($niz1+ ($size<1?4:($size<2?3:2))),$chr,$color3);  



imagechar($thiz,$size,$i1+4,($niz1+ ($size<1?3:($size<2?2:1))),$chr,$color4); } return; }  



for($i=0;  



$i<20; ++$i) imagekub($thiz,rand(0,2),rand(0,56),rand (0,14),'?');  



$o=-1;  



for($i=1;  



$i<=57;  



$i+=18) imagekub($thiz,rand(2,4),$i,rand(0,14),substr ($_SESSION['code'],(++$o)));  



ob_start();  



ImageGif($thiz);  



ImageDestroy($thiz);  



header("Content-Type: image/gif");  



header('Content-Disposition: inline; filename=code.gif');  



header('Content-Length: '.ob_get_length());  



ob_end_flush();  



?>