- //-------------------------------------
- // 文件说明: 数学运算验证码
- // 文件作者: Jesse Lee
- // 最后更新: 2008-09-07
- //-------------------------------------
- session_start();
- $sessionvar = 'vdcode'; //Session 变量名称
- $width = 150; // 图像宽度
- $height = 20; // 图像高度
- $operator = '+-*'; // 运算符
- $code = array();
- $code[] = mt_rand(1, 9);
- $code[] = $operator {
- mt_rand(0, 2)
- };
- $code[] = mt_rand(1, 9);
- $code[] = $operator {
- mt_rand(0, 2)
- };
- $code[] = mt_rand(1, 9);
- $codestr = implode('', $code);
- eval("\$result =".implode('', $code).";");
- $code[] = '=';
- $_SESSION[$sessionvar] = $result;
- $img = ImageCreate($width, $height);
- ImageColorAllocate($img, mt_rand(230, 250), mt_rand(230, 250), mt_rand(230, 250));
- $color = ImageColorAllocate($img, 0, 0, 0);
- $offset = 0;
- foreach($code as $char) {
- $offset += 20;
- $txtcolor = ImageColorAllocate($img, mt_rand(0, 255), mt_rand(0, 150), mt_rand(0, 255));
- ImageChar($img, mt_rand(3, 5), $offset, mt_rand(1, 5), $char, $txtcolor);
- }
- for ($i = 0; $i < 100; $i++) {
- $pxcolor = ImageColorAllocate($img, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
- ImageSetPixel($img, mt_rand(0, $width), mt_rand(0, $height), $pxcolor);
- }
- header('Content-type: image/png');
- ImagePng($img); ? >
来源: https://www.php1.cn/detail/php-9768bfd0af.html