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=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);
?>
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java->struts
