图形数字验证代码
Code:
srand((double)microtime()*1000000);//验证用户输入是否和验证码一致
if(isset($_POST['authinput']))
{
if(strcmp($_POST['authnum'],$_POST['authinput'])==0)
echo "验证成功！";
else
echo "验证失败！";
}//生成新的四位整数验证码
while(($authnum=rand()%10000)<1000);
?>-------------------------------------------------------------------------------------------------------------
//生成验证码图片
Header("Content-type: image/PNG");
srand((double)microtime()*1000000);
$im = imagecreate(58,28);
$black = ImageColorAllocate($im, 0,0,0);
$white = ImageColorAllocate($im, 255,255,255);
$gray = ImageColorAllocate($im, 200,200,200);
imagefill($im,68,30,$gray);//将四位整数验证码绘入图片
imagestring($im, 5, 10, 8, $HTTP_GET_VARS['authnum'], $white);for($i=0;$i<50;$i++) //加入干扰象素
{
imagesetpixel($im, rand()%70 , rand()%30 , $gray);
}ImagePNG($im);
ImageDestroy($im);
?>
