数字验证码
/*
* Filename: authpage.php
*/
session_start();
// srand((double)microtime()*1000000);
$authnum = $_SESSION[''authnum''];
//验证用户输入是否和验证码一致
if(isset($_POST[''authinput'']))
{
if(strcmp($_POST[''authinput''],$_SESSION[''authnum''])==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)
?>
form action=test4.php method=post>
table>
请输入验证码:input type=text name=authinput style="width: 80px">br>
input type=submit name="验证" value="提交验证码">
input type=hidden name=authnum value= echo $authnum; ?>>
img src=authimg.php?authnum= echo $authnum; ?>>
table>
form>
authimg.php
php
//生成验证码图片
Header("Content-type: image/PNG");
srand((double)microtime()*1000000);//播下一个生成随机数字的种子,以方便下面随机数生成的使用
session_start();//将随机数存入session中
$_SESSION[''authnum'']="";
$im = imagecreate(62,20); //制定图片背景大小
$black = ImageColorAllocate($im, 0,0,0); //设定三种颜色
$white = ImageColorAllocate($im, 255,255,255);
$gray = ImageColorAllocate($im, 200,200,200);
imagefill($im,0,0,$gray); //采用区域填充法,设定(0,0)
while(($authnum=rand()%100000)10000);
//将四位整数验证码绘入图片
$_SESSION[''authnum'']=$authnum;
imagestring($im, 5, 10, 3, $authnum, $black);
// 用 col 颜色将字符串 s 画到 image 所代表的图像的 x,y 座标处像的左上角为 0, 0)。
//如果 font 是 1,2,3,4 或 5,则使用内置字体
for($i=0;$i200;$i++) //加入干扰象素
{
$randcolor = ImageColorallocate($im,rand(0,255),rand(0,255),rand(0,255));
imagesetpixel($im, rand()%70 , rand()%30 , $randcolor);
}
ImagePNG($im);
ImageDestroy($im);
?>

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