dengbw
141 lines
4.7 KiB
PHP
141 lines
4.7 KiB
PHP
<?php
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/** Captcha 验证码类
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* Date: 2011-02-19
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* Author: fdipzone
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*/
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class MyCaptcha
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{//class start
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private $sname = '';
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public function __construct($sname = '')
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{ // $sname captcha session name
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$this->sname = $sname == '' ? 'm_captcha' : $sname;
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}
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/** 生成验证码图片
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* @param int $length 验证码长度
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* @param Array $param 參數
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* @return IMG
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*/
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public function create($length = 4, $param = array())
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{
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if (!$param['base64']) {
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Header("Content-type: image/PNG");
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}
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$authnum = $this->random($length); //生成验证码字符.
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$width = isset($param['width']) ? $param['width'] : 13; //文字宽度
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$height = isset($param['height']) ? $param['height'] : 18; //文字高度
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$pnum = isset($param['pnum']) ? $param['pnum'] : 100; //干扰象素个数
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$lnum = isset($param['lnum']) ? $param['lnum'] : 2; //干扰线条数
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if (!$param['base64']) {
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$this->captcha_session($this->sname, $authnum); //将随机数写入session
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}
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$pw = $width * $length + 10;
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$ph = $height + 6;
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$im = imagecreate($pw, $ph); //imagecreate() 新建图像，大小为 x_size 和 y_size 的空白图像。
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$black = ImageColorAllocate($im, 238, 238, 238); //设置背景颜色
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$values = array(
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mt_rand(0, $pw), mt_rand(0, $ph),
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mt_rand(0, $pw), mt_rand(0, $ph),
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mt_rand(0, $pw), mt_rand(0, $ph),
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mt_rand(0, $pw), mt_rand(0, $ph),
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mt_rand(0, $pw), mt_rand(0, $ph),
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mt_rand(0, $pw), mt_rand(0, $ph)
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);
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imagefilledpolygon($im, $values, 6, ImageColorAllocate($im, mt_rand(170, 255), mt_rand(200, 255), mt_rand(210, 255))); //设置干扰多边形底图
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/* 文字 */
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for ($i = 0; $i < strlen($authnum); $i++) {
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$font = ImageColorAllocate($im, mt_rand(0, 50), mt_rand(0, 150), mt_rand(0, 200));//设置文字颜色
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$x = $i / $length * $pw + rand(1, 6); //设置随机X坐标
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$y = rand(1, $ph / 3); //设置随机Y坐标
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imagestring($im, mt_rand(4, 6), $x, $y, substr($authnum, $i, 1), $font);
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}
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/* 加入干扰象素 */
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for ($i = 0; $i < $pnum; $i++) {
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$dist = ImageColorAllocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255)); //设置杂点颜色
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imagesetpixel($im, mt_rand(0, $pw), mt_rand(0, $ph), $dist);
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}
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/* 加入干扰线 */
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for ($i = 0; $i < $lnum; $i++) {
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$dist = ImageColorAllocate($im, mt_rand(50, 255), mt_rand(150, 255), mt_rand(200, 255)); //设置线颜色
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imageline($im, mt_rand(0, $pw), mt_rand(0, $ph), mt_rand(0, $pw), mt_rand(0, $ph), $dist);
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}
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ImagePNG($im); //以 PNG 格式将图像输出到浏览器或文件
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$content = '';
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if ($param['base64']) {
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$content = ob_get_clean();
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}
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ImageDestroy($im); //销毁一图像
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if ($param['base64']) {
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$base64 = base64_encode($content); // base64加密后的图片
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return ['base64' => 'data:image/png;base64,' . $base64, 'text' => $authnum];
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}
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}
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/** 检查验证码
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* @param String $captcha 验证码
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* @param int $flag 验证成功后 0:不清除session 1:清除session
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* @return boolean
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*/
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public function check($captcha, $flag = 1)
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{
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if (empty($captcha)) {
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return false;
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} else {
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if (strtoupper($captcha) == $this->captcha_session($this->sname)) { //检测验证码
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if ($flag == 1) {
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$this->captcha_session($this->sname, '');
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}
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return true;
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} else {
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return false;
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}
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}
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}
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/* 产生随机数函数
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* @param int $length 需要随机生成的字符串數
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* @return String
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*/
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private function random($length)
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{
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$hash = '';
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//$chars = 'ABCDEFGHIJKLMNPQRSTUVWXYZ23456789';
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$chars = 'abcdefghijklmnpqrstuvwxyz23456789';
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$max = strlen($chars) - 1;
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for ($i = 0; $i < $length; $i++) {
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$hash .= $chars[mt_rand(0, $max)];
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}
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return $hash;
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}
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/** 验证码session处理方法
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* @param String $name captcha session name
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* @param String $value
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* @return String
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*/
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private function captcha_session($name, $value = null)
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{
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if (isset($value)) {
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if ($value !== '') {
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$_SESSION[$name] = $value;
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} else {
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unset($_SESSION[$name]);
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}
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} else {
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return isset($_SESSION[$name]) ? $_SESSION[$name] : '';
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}
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}
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} // class end
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?>
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