php 验证码



Link: http://www.white-hat-web-design.co.uk/articles/php-captcha.php-* This program is free software　you can redistribute it and/or

* modify it under the terms of the GNU General Public License

* as published by the Free Software Foundation　either version 2

* of the License, or (at your option) any later version.

*

* This program is distributed in the hope that it will be useful,

* but WITHOUT ANY WARRANTY　without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

* GNU General Public License for more details:

* http://www.gnu.org/licenses/gpl.html