以下代码本人调试全部通过。运行authpage.php。

<?

/*

* filename: authpage.php

*/

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);

?>

<form action=authpage.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=http://www.dvbbs.net/tech/php/authimg.php?authnum=<? echo $authnum; ?>>

</table>

</form>

-------------------------------------------------------------------------------------------------------------

<?
/*

* 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

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