图形数字验证代码
2018-09-07 11:43
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(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);
?>