|
2、生成验证码 auth.php
-
-
session_start(); - header("Content-type:image/png");
$img_width=100; - $img_height=20;
srand(microtime()*100000); - for($i=0;$i<4;$i++)
- {
- $new_number.=dechex(rand(0,15));
- }
$_SESSION[check_auth]=$new_number; - $new_number=imageCreate($img_width,$img_height);//创建图象
- ImageColorAllocate($new_number,255,255,255); //设置背景色为白色
for($i=0;$i
- {
- $font=mt_rand(3,5);
- $x=mt_rand(1,8) + $img_width*$i/4;
- $y=mt_rand(1,$img_height/4);
- $color=imageColorAllocate($new_number,mt_rand(0,100),mt_rand(0,150),mt_rand(0,200));//设置字符颜色
- imageString($new_number,$font,$x,$y,$_SESSION[check_auth][$i],$color);//输出字符
- }
ImagePng($new_number); - ImageDestroy($new_number);
- ?>
-
3、提交页面 check_auth.php
-
-
- session_start();
- $auth=$_POST['auth'];
if(empty($auth)) - {
- echo '错误：验证码不能为空';
- die;
- }
if($auth==$_SESSION['check_auth']) - {
- echo '正确';
- }
- else
- {
- echo '错误：验证码输入错误';
- }
- ?>
-
|
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