Cache problem with gd

[Gruzin]

Hey guys,

 

Here is my problem:

 

I have a security script which generates images with random numbers (everything works fine), and when the registration is finished user gets redirected back to the same register.php and the image doesn't reload (change). I've tryed almost everything but without any luck

 

here is a part of my code:

 

// security code
$ivalfrom =ord("a");
$ivalto =ord("z");

for($i=$ivalfrom; $i<=$ivalto; $i++){
$arralpha[] = chr($i);
}

$rand_al = array_rand ($arralpha, 3);
$strrandom = $arralpha[$rand_al[0]] . $arralpha[$rand_al[1]] . $arralpha[$rand_al[3]];
$numpart=mt_rand(10,99);
$strrandom .= $numpart;

//header ("Content-type: image/png");
$img_handle = imagecreate (50, 20) or die ("Cannot Create image"); 
$back_color = imagecolorallocate ($img_handle, 255, 255, 255); 
$txt_color = imagecolorallocate ($img_handle, 233, 114, 191);
$col = imagecolorallocate($img_handle, 220, 220, 220);
for($j=0; $j<=50; $j=$j+5){
imageline($img_handle, $j, 20, $j, 0, $col);
}
imagestring ($img_handle, 31, 7, 2,  $strrandom, $txt_color);
imagepng ($img_handle,"code.png") or die("Cannot save image");
// end security code

 

 

Thanks for reading,

George

 

[Gruzin]

* bump *