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- <?php
- // +----------------------------------------------------------------------
- // | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
- // +----------------------------------------------------------------------
- // | Copyright (c) 2006-2014 http://thinkphp.cn All rights reserved.
- // +----------------------------------------------------------------------
- // | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
- // +----------------------------------------------------------------------
- // | Author: 麦当苗儿 <zuojiazi@vip.qq.com> <http://www.zjzit.cn>
- // +----------------------------------------------------------------------
- namespace Think;
- class Verify {
- protected $config = array(
- 'seKey' => 'Tp3.net', // 验证码加密密钥
- 'codeSet' => '2345678abcdefhijkmnpqrstuvwxyzABCDEFGHJKLMNPQRTUVWXY', // 验证码字符集合
- 'expire' => 1800, // 验证码过期时间(s)
- 'useZh' => false, // 使用中文验证码
- 'zhSet' => '', // 中文验证码字符串
- 'useImgBg' => false, // 使用背景图片
- 'fontSize' => 25, // 验证码字体大小(px)
- 'useCurve' => false, // 是否画混淆曲线
- 'useNoise' => true, // 是否添加杂点
- 'imageH' => 0, // 验证码图片高度
- 'imageW' => 0, // 验证码图片宽度
- 'length' => 5, // 验证码位数
- 'fontttf' => '', // 验证码字体,不设置随机获取
- 'bg' => array(245, 245, 245), // 背景颜色
- 'reset' => true, // 验证成功后是否重置
- );
- private $_image = NULL; // 验证码图片实例
- private $_color = NULL; // 验证码字体颜色
- /**
- * 架构方法 设置参数
- * @access public
- * @param array $config 配置参数
- */
- public function __construct($config=array()){
- $this->config = array_merge($this->config, $config);
- }
- /**
- * 使用 $this->name 获取配置
- * @access public
- * @param string $name 配置名称
- * @return multitype 配置值
- */
- public function __get($name) {
- return $this->config[$name];
- }
- /**
- * 设置验证码配置
- * @access public
- * @param string $name 配置名称
- * @param string $value 配置值
- * @return void
- */
- public function __set($name,$value){
- if(isset($this->config[$name])) {
- $this->config[$name] = $value;
- }
- }
- /**
- * 检查配置
- * @access public
- * @param string $name 配置名称
- * @return bool
- */
- public function __isset($name){
- return isset($this->config[$name]);
- }
- /**
- * 验证验证码是否正确
- * @access public
- * @param string $code 用户验证码
- * @param string $id 验证码标识
- * @return bool 用户验证码是否正确
- */
- public function check($code, $id = '') {
- $key = $this->authcode($this->seKey).$id;
- // 验证码不能为空
- $secode = session($key);
- if(empty($code) || empty($secode)) {
- return false;
- }
- // session 过期
- if(NOW_TIME - $secode['verify_time'] > $this->expire) {
- session($key, null);
- return false;
- }
- if($this->authcode(strtoupper($code)) == $secode['verify_code']) {
- // $this->reset && session($key, null);
- return true;
- }
- return false;
- }
- /**
- * 输出验证码并把验证码的值保存的session中
- * 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');
- * @access public
- * @param string $id 要生成验证码的标识
- * @return void
- */
- public function entry($id = '') {
- // 图片宽(px)
- $this->imageW || $this->imageW = $this->length*$this->fontSize*1.5 + $this->length*$this->fontSize/2;
- // 图片高(px)
- $this->imageH || $this->imageH = $this->fontSize * 2.5;
- // 建立一幅 $this->imageW x $this->imageH 的图像
- $this->_image = imagecreate($this->imageW, $this->imageH);
- // 设置背景
- imagecolorallocate($this->_image, $this->bg[0], $this->bg[1], $this->bg[2]);
- // 验证码字体随机颜色
- $this->_color = imagecolorallocate($this->_image, mt_rand(1,150), mt_rand(1,150), mt_rand(1,150));
- // 验证码使用随机字体
- $ttfPath = dirname(__FILE__) . '/Verify/' . ($this->useZh ? 'zhttfs' : 'ttfs') . '/';
- if(empty($this->fontttf)){
- $dir = dir($ttfPath);
- $ttfs = array();
- while (false !== ($file = $dir->read())) {
- if($file[0] != '.' && substr($file, -4) == '.ttf') {
- $ttfs[] = $file;
- }
- }
- $dir->close();
- $this->fontttf = $ttfs[array_rand($ttfs)];
- }
- $this->fontttf = $ttfPath . $this->fontttf;
-
- if($this->useImgBg) {
- $this->_background();
- }
-
- if ($this->useNoise) {
- // 绘杂点
- $this->_writeNoise();
- }
- if ($this->useCurve) {
- // 绘干扰线
- $this->_writeCurve();
- }
-
- // 绘验证码
- $code = array(); // 验证码
- $codeNX = 0; // 验证码第N个字符的左边距
- if($this->useZh){ // 中文验证码
- for ($i = 0; $i<$this->length; $i++) {
- $code[$i] = iconv_substr($this->zhSet,floor(mt_rand(0,mb_strlen($this->zhSet,'utf-8')-1)),1,'utf-8');
- 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]);
- }
- }else{
- for ($i = 0; $i<$this->length; $i++) {
- $code[$i] = $this->codeSet[mt_rand(0, strlen($this->codeSet)-1)];
- $codeNX += mt_rand($this->fontSize*1.2, $this->fontSize*1.6);
- imagettftext($this->_image, $this->fontSize, mt_rand(-40, 40), $codeNX, $this->fontSize*1.6, $this->_color, $this->fontttf, $code[$i]);
- }
- }
-
- // 保存验证码
- $key = $this->authcode($this->seKey);
- $code = $this->authcode(strtoupper(implode('', $code)));
- $secode = array();
- $secode['verify_code'] = $code; // 把校验码保存到session
- $secode['verify_time'] = NOW_TIME; // 验证码创建时间
- session($key.$id, $secode);
-
- header('Cache-Control: private, max-age=0, no-store, no-cache, must-revalidate');
- header('Cache-Control: post-check=0, pre-check=0', false);
- header('Pragma: no-cache');
- header("content-type: image/png");
- // 输出图像
- imagepng($this->_image);
- imagedestroy($this->_image);
- }
- /**
- * 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)
- *
- * 高中的数学公式咋都忘了涅,写出来
- * 正弦型函数解析式:y=Asin(ωx+φ)+b
- * 各常数值对函数图像的影响:
- * A:决定峰值(即纵向拉伸压缩的倍数)
- * b:表示波形在Y轴的位置关系或纵向移动距离(上加下减)
- * φ:决定波形与X轴位置关系或横向移动距离(左加右减)
- * ω:决定周期(最小正周期T=2π/∣ω∣)
- *
- */
- private function _writeCurve() {
- $px = $py = 0;
-
- // 曲线前部分
- $A = mt_rand(1, $this->imageH/2); // 振幅
- $b = mt_rand(-$this->imageH/4, $this->imageH/4); // Y轴方向偏移量
- $f = mt_rand(-$this->imageH/4, $this->imageH/4); // X轴方向偏移量
- $T = mt_rand($this->imageH, $this->imageW*2); // 周期
- $w = (2* M_PI)/$T;
-
- $px1 = 0; // 曲线横坐标起始位置
- $px2 = mt_rand($this->imageW/2, $this->imageW * 0.8); // 曲线横坐标结束位置
- for ($px=$px1; $px<=$px2; $px = $px + 1) {
- if ($w!=0) {
- $py = $A * sin($w*$px + $f)+ $b + $this->imageH/2; // y = Asin(ωx+φ) + b
- $i = (int) ($this->fontSize/5);
- while ($i > 0) {
- imagesetpixel($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
- $i--;
- }
- }
- }
-
- // 曲线后部分
- $A = mt_rand(1, $this->imageH/2); // 振幅
- $f = mt_rand(-$this->imageH/4, $this->imageH/4); // X轴方向偏移量
- $T = mt_rand($this->imageH, $this->imageW*2); // 周期
- $w = (2* M_PI)/$T;
- $b = $py - $A * sin($w*$px + $f) - $this->imageH/2;
- $px1 = $px2;
- $px2 = $this->imageW;
- for ($px=$px1; $px<=$px2; $px=$px+ 1) {
- if ($w!=0) {
- $py = $A * sin($w*$px + $f)+ $b + $this->imageH/2; // y = Asin(ωx+φ) + b
- $i = (int) ($this->fontSize/5);
- while ($i > 0) {
- imagesetpixel($this->_image, $px + $i, $py + $i, $this->_color);
- $i--;
- }
- }
- }
- }
- /**
- * 画杂点
- * 往图片上写不同颜色的字母或数字
- */
- private function _writeNoise() {
- $codeSet = '2345678abcdefhijkmnpqrstuvwxyz';
- for($i = 0; $i < 10; $i++){
- //杂点颜色
- $noiseColor = imagecolorallocate($this->_image, mt_rand(150,225), mt_rand(150,225), mt_rand(150,225));
- for($j = 0; $j < 5; $j++) {
- // 绘杂点
- imagestring($this->_image, 5, mt_rand(-10, $this->imageW), mt_rand(-10, $this->imageH), $codeSet[mt_rand(0, 29)], $noiseColor);
- }
- }
- }
- /**
- * 绘制背景图片
- * 注:如果验证码输出图片比较大,将占用比较多的系统资源
- */
- private function _background() {
- $path = dirname(__FILE__).'/Verify/bgs/';
- $dir = dir($path);
- $bgs = array();
- while (false !== ($file = $dir->read())) {
- if($file[0] != '.' && substr($file, -4) == '.jpg') {
- $bgs[] = $path . $file;
- }
- }
- $dir->close();
- $gb = $bgs[array_rand($bgs)];
- list($width, $height) = @getimagesize($gb);
- // Resample
- $bgImage = @imagecreatefromjpeg($gb);
- @imagecopyresampled($this->_image, $bgImage, 0, 0, 0, 0, $this->imageW, $this->imageH, $width, $height);
- @imagedestroy($bgImage);
- }
- /* 加密验证码 */
- private function authcode($str){
- $key = substr(md5($this->seKey), 5, 8);
- $str = substr(md5($str), 8, 10);
- return md5($key . $str);
- }
- }
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