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(isset($_POST["authinput"])){if(strcmp($_POST["authnum"],$_POST["authinput"])==0)echo "验证成功！";elseecho "验证失败！";}//生成新的四位整数验证码while(($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);???>