Verify.class.php 11 KB

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  1. <?php
  2. // +----------------------------------------------------------------------
  3. // | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
  4. // +----------------------------------------------------------------------
  5. // | Copyright (c) 2006-2014 http://thinkphp.cn All rights reserved.
  6. // +----------------------------------------------------------------------
  7. // | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
  8. // +----------------------------------------------------------------------
  9. // | Author: 麦当苗儿 <zuojiazi@vip.qq.com> <http://www.zjzit.cn>
  10. // +----------------------------------------------------------------------
  11. namespace Think;
  12. class Verify {
  13. protected $config = array(
  14. 'seKey' => 'Tp3.net', // 验证码加密密钥
  15. 'codeSet' => '2345678abcdefhijkmnpqrstuvwxyzABCDEFGHJKLMNPQRTUVWXY', // 验证码字符集合
  16. 'expire' => 1800, // 验证码过期时间(s)
  17. 'useZh' => false, // 使用中文验证码
  18. 'zhSet' => '', // 中文验证码字符串
  19. 'useImgBg' => false, // 使用背景图片
  20. 'fontSize' => 25, // 验证码字体大小(px)
  21. 'useCurve' => false, // 是否画混淆曲线
  22. 'useNoise' => true, // 是否添加杂点
  23. 'imageH' => 0, // 验证码图片高度
  24. 'imageW' => 0, // 验证码图片宽度
  25. 'length' => 5, // 验证码位数
  26. 'fontttf' => '', // 验证码字体,不设置随机获取
  27. 'bg' => array(245, 245, 245), // 背景颜色
  28. 'reset' => true, // 验证成功后是否重置
  29. );
  30. private $_image = NULL; // 验证码图片实例
  31. private $_color = NULL; // 验证码字体颜色
  32. /**
  33. * 架构方法 设置参数
  34. * @access public
  35. * @param array $config 配置参数
  36. */
  37. public function __construct($config=array()){
  38. $this->config = array_merge($this->config, $config);
  39. }
  40. /**
  41. * 使用 $this->name 获取配置
  42. * @access public
  43. * @param string $name 配置名称
  44. * @return multitype 配置值
  45. */
  46. public function __get($name) {
  47. return $this->config[$name];
  48. }
  49. /**
  50. * 设置验证码配置
  51. * @access public
  52. * @param string $name 配置名称
  53. * @param string $value 配置值
  54. * @return void
  55. */
  56. public function __set($name,$value){
  57. if(isset($this->config[$name])) {
  58. $this->config[$name] = $value;
  59. }
  60. }
  61. /**
  62. * 检查配置
  63. * @access public
  64. * @param string $name 配置名称
  65. * @return bool
  66. */
  67. public function __isset($name){
  68. return isset($this->config[$name]);
  69. }
  70. /**
  71. * 验证验证码是否正确
  72. * @access public
  73. * @param string $code 用户验证码
  74. * @param string $id 验证码标识
  75. * @return bool 用户验证码是否正确
  76. */
  77. public function check($code, $id = '') {
  78. $key = $this->authcode($this->seKey).$id;
  79. // 验证码不能为空
  80. $secode = session($key);
  81. if(empty($code) || empty($secode)) {
  82. return false;
  83. }
  84. // session 过期
  85. if(NOW_TIME - $secode['verify_time'] > $this->expire) {
  86. session($key, null);
  87. return false;
  88. }
  89. if($this->authcode(strtoupper($code)) == $secode['verify_code']) {
  90. // $this->reset && session($key, null);
  91. return true;
  92. }
  93. return false;
  94. }
  95. /**
  96. * 输出验证码并把验证码的值保存的session中
  97. * 验证码保存到session的格式为: array('verify_code' => '验证码值', 'verify_time' => '验证码创建时间');
  98. * @access public
  99. * @param string $id 要生成验证码的标识
  100. * @return void
  101. */
  102. public function entry($id = '') {
  103. // 图片宽(px)
  104. $this->imageW || $this->imageW = $this->length*$this->fontSize*1.5 + $this->length*$this->fontSize/2;
  105. // 图片高(px)
  106. $this->imageH || $this->imageH = $this->fontSize * 2.5;
  107. // 建立一幅 $this->imageW x $this->imageH 的图像
  108. $this->_image = imagecreate($this->imageW, $this->imageH);
  109. // 设置背景
  110. imagecolorallocate($this->_image, $this->bg[0], $this->bg[1], $this->bg[2]);
  111. // 验证码字体随机颜色
  112. $this->_color = imagecolorallocate($this->_image, mt_rand(1,150), mt_rand(1,150), mt_rand(1,150));
  113. // 验证码使用随机字体
  114. $ttfPath = dirname(__FILE__) . '/Verify/' . ($this->useZh ? 'zhttfs' : 'ttfs') . '/';
  115. if(empty($this->fontttf)){
  116. $dir = dir($ttfPath);
  117. $ttfs = array();
  118. while (false !== ($file = $dir->read())) {
  119. if($file[0] != '.' && substr($file, -4) == '.ttf') {
  120. $ttfs[] = $file;
  121. }
  122. }
  123. $dir->close();
  124. $this->fontttf = $ttfs[array_rand($ttfs)];
  125. }
  126. $this->fontttf = $ttfPath . $this->fontttf;
  127. if($this->useImgBg) {
  128. $this->_background();
  129. }
  130. if ($this->useNoise) {
  131. // 绘杂点
  132. $this->_writeNoise();
  133. }
  134. if ($this->useCurve) {
  135. // 绘干扰线
  136. $this->_writeCurve();
  137. }
  138. // 绘验证码
  139. $code = array(); // 验证码
  140. $codeNX = 0; // 验证码第N个字符的左边距
  141. if($this->useZh){ // 中文验证码
  142. for ($i = 0; $i<$this->length; $i++) {
  143. $code[$i] = iconv_substr($this->zhSet,floor(mt_rand(0,mb_strlen($this->zhSet,'utf-8')-1)),1,'utf-8');
  144. imagettftext($this->_image, $this->fontSize, mt_rand(-40, 40), $this->fontSize*($i+1)*1.5, $this->fontSize + mt_rand(10, 20), $this->_color, $this->fontttf, $code[$i]);
  145. }
  146. }else{
  147. for ($i = 0; $i<$this->length; $i++) {
  148. $code[$i] = $this->codeSet[mt_rand(0, strlen($this->codeSet)-1)];
  149. $codeNX += mt_rand($this->fontSize*1.2, $this->fontSize*1.6);
  150. imagettftext($this->_image, $this->fontSize, mt_rand(-40, 40), $codeNX, $this->fontSize*1.6, $this->_color, $this->fontttf, $code[$i]);
  151. }
  152. }
  153. // 保存验证码
  154. $key = $this->authcode($this->seKey);
  155. $code = $this->authcode(strtoupper(implode('', $code)));
  156. $secode = array();
  157. $secode['verify_code'] = $code; // 把校验码保存到session
  158. $secode['verify_time'] = NOW_TIME; // 验证码创建时间
  159. session($key.$id, $secode);
  160. header('Cache-Control: private, max-age=0, no-store, no-cache, must-revalidate');
  161. header('Cache-Control: post-check=0, pre-check=0', false);
  162. header('Pragma: no-cache');
  163. header("content-type: image/png");
  164. // 输出图像
  165. imagepng($this->_image);
  166. imagedestroy($this->_image);
  167. }
  168. /**
  169. * 画一条由两条连在一起构成的随机正弦函数曲线作干扰线(你可以改成更帅的曲线函数)
  170. *
  171. * 高中的数学公式咋都忘了涅,写出来
  172. * 正弦型函数解析式:y=Asin(ωx+φ)+b
  173. * 各常数值对函数图像的影响:
  174. * A:决定峰值(即纵向拉伸压缩的倍数)
  175. * b:表示波形在Y轴的位置关系或纵向移动距离(上加下减)
  176. * φ:决定波形与X轴位置关系或横向移动距离(左加右减)
  177. * ω:决定周期(最小正周期T=2π/∣ω∣)
  178. *
  179. */
  180. private function _writeCurve() {
  181. $px = $py = 0;
  182. // 曲线前部分
  183. $A = mt_rand(1, $this->imageH/2); // 振幅
  184. $b = mt_rand(-$this->imageH/4, $this->imageH/4); // Y轴方向偏移量
  185. $f = mt_rand(-$this->imageH/4, $this->imageH/4); // X轴方向偏移量
  186. $T = mt_rand($this->imageH, $this->imageW*2); // 周期
  187. $w = (2* M_PI)/$T;
  188. $px1 = 0; // 曲线横坐标起始位置
  189. $px2 = mt_rand($this->imageW/2, $this->imageW * 0.8); // 曲线横坐标结束位置
  190. for ($px=$px1; $px<=$px2; $px = $px + 1) {
  191. if ($w!=0) {
  192. $py = $A * sin($w*$px + $f)+ $b + $this->imageH/2; // y = Asin(ωx+φ) + b
  193. $i = (int) ($this->fontSize/5);
  194. while ($i > 0) {
  195. imagesetpixel($this->_image, $px + $i , $py + $i, $this->_color); // 这里(while)循环画像素点比imagettftext和imagestring用字体大小一次画出(不用这while循环)性能要好很多
  196. $i--;
  197. }
  198. }
  199. }
  200. // 曲线后部分
  201. $A = mt_rand(1, $this->imageH/2); // 振幅
  202. $f = mt_rand(-$this->imageH/4, $this->imageH/4); // X轴方向偏移量
  203. $T = mt_rand($this->imageH, $this->imageW*2); // 周期
  204. $w = (2* M_PI)/$T;
  205. $b = $py - $A * sin($w*$px + $f) - $this->imageH/2;
  206. $px1 = $px2;
  207. $px2 = $this->imageW;
  208. for ($px=$px1; $px<=$px2; $px=$px+ 1) {
  209. if ($w!=0) {
  210. $py = $A * sin($w*$px + $f)+ $b + $this->imageH/2; // y = Asin(ωx+φ) + b
  211. $i = (int) ($this->fontSize/5);
  212. while ($i > 0) {
  213. imagesetpixel($this->_image, $px + $i, $py + $i, $this->_color);
  214. $i--;
  215. }
  216. }
  217. }
  218. }
  219. /**
  220. * 画杂点
  221. * 往图片上写不同颜色的字母或数字
  222. */
  223. private function _writeNoise() {
  224. $codeSet = '2345678abcdefhijkmnpqrstuvwxyz';
  225. for($i = 0; $i < 10; $i++){
  226. //杂点颜色
  227. $noiseColor = imagecolorallocate($this->_image, mt_rand(150,225), mt_rand(150,225), mt_rand(150,225));
  228. for($j = 0; $j < 5; $j++) {
  229. // 绘杂点
  230. imagestring($this->_image, 5, mt_rand(-10, $this->imageW), mt_rand(-10, $this->imageH), $codeSet[mt_rand(0, 29)], $noiseColor);
  231. }
  232. }
  233. }
  234. /**
  235. * 绘制背景图片
  236. * 注:如果验证码输出图片比较大,将占用比较多的系统资源
  237. */
  238. private function _background() {
  239. $path = dirname(__FILE__).'/Verify/bgs/';
  240. $dir = dir($path);
  241. $bgs = array();
  242. while (false !== ($file = $dir->read())) {
  243. if($file[0] != '.' && substr($file, -4) == '.jpg') {
  244. $bgs[] = $path . $file;
  245. }
  246. }
  247. $dir->close();
  248. $gb = $bgs[array_rand($bgs)];
  249. list($width, $height) = @getimagesize($gb);
  250. // Resample
  251. $bgImage = @imagecreatefromjpeg($gb);
  252. @imagecopyresampled($this->_image, $bgImage, 0, 0, 0, 0, $this->imageW, $this->imageH, $width, $height);
  253. @imagedestroy($bgImage);
  254. }
  255. /* 加密验证码 */
  256. private function authcode($str){
  257. $key = substr(md5($this->seKey), 5, 8);
  258. $str = substr(md5($str), 8, 10);
  259. return md5($key . $str);
  260. }
  261. }