图形数字验证代码

图形数字验证代码 code: <?

/*

* filename: authpage.php

*/

srand((double)microtime()*1000000);

//验证用户输入是否和验证码一致

if(ist($_post[‘authinput’]))

{

if(strcmp($_post[‘authnum’],$_post[‘authinput’])==0)

echo “验证成功！”;

el

echo “验证失败！”;

}

//生成新的四位整数验证码

while(($aerar音标uthnum=rand()%10000)<1000);

?>

<form action=authpage.php method=post>张店区实验幼儿园;

<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=新学期新气象黑板报<? echo $authnum; ?>>

<img src=authimg.php?authnum=<? echo $authnum; ?>>

</table&g全国计算机等级考试查询t;

</form>

————————————————————————————————————-

&l曼陀罗华t;?

/*

* filename: authimg.php

*/

//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

{

imagetpixel($im, rand()%70 , rand()%30 , $gray);

}

imagepng($im);

imagedestroy($im);

?>