ThinkPHP 3.2.3 加减乘法验证码类
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Thinkphp 3.2.3 自带的验证码类位于 /ThinkPHP/Library/Think/Verify.class.php,字体文件位于 /ThinkPHP/Library/Think/Verify/
可以在 Verify.class.php 文件内进行修改,也可以单独写一个类继承自带的验证码类。如果单独写一个继承的类,可以重用父类的属性和方法,但是要注意的是父类中有一些属性和方法是私有(private)的,可以修改这些私有的属性和方法为保护(protected)的,如果不希望修改框架自带的方法的话,也可以在子类中再定义这些属性和方法。
测试的控制器位于 /Application/Home/Controller/TestVerifyController.class.php
测试的试图位于 /Application/Home/View/User/verify.html
自定义的子类位于 /Applicaion/Home/Common/VerifyProcess.class.php
VerifyProcess.class.php:
<?php namespace Home\\Common; use Think\\Verify; class VerifyProcess extends Verify { private $_image = NULL; // 验证码图片实例 private $_color = NULL; // 验证码字体颜色 public function entryProcess($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 = $_SERVER[\'DOCUMENT_ROOT\'].\'/ThinkPHP/Library/Think/Verify/\' . ($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 $codeNX = 0; // 验证码第N个字符的左边距 // 验证码为简单运算 $a = mt_rand(1,9); $b = mt_rand(1,9); $operate_array = array(\'+\', \'-\', \'*\'); $key = mt_rand(0, count($operate_array) - 1); if($operate_array[$key] == \'+\') { // 加法 $code = $a.\'+\'.$b.\'=\'; $result = intval($a + $b); } elseif($operate_array[$key] == \'-\') { // 减法 $code = max($a,$b).\'-\'.min($a,$b).\'=\'; $result = intval(abs($a - $b)); } else { // 乘法 $code = $a.\'*\'.$b.\'=\'; $result = intval($a * $b); } $this->length = 4; for ($i = 0; $i<$this->length; $i++) { $codeNX += mt_rand($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); $result = $this->authcode($result); $secode = array(); $secode[\'verify_code\'] = $result; // 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); } } } /** * 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); $i--; } } } } /* 加密验证码 */ private function authcode($str){ $key = substr(md5($this->seKey), 5, 8); $str = substr(md5($str), 8, 10); return md5($key . $str); } /** * 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); } }
TestVerifyController.class.php:
<?php namespace Home\\Controller; use Think\\Controller; use Home\\Common\\VerifyProcess; class TestVerifyController extends Controller { // 界面 public function index() { $this->display(\'User/verify\'); } // 验证 public function check_verify() { $verify = new VerifyProcess(); if(!$verify->check($_POST[\'verify\'])) { $this->error(\'验证码错误\'); } } // 显示验证码 public function verify() { $verify = new VerifyProcess(); $verify->entryProcess(); } }
verify.html:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> <script src="http://lib.sinaapp.com/js/jquery/1.9.1/jquery-1.9.1.min.js"></script> </head> <body> <form action="{:U(\'Home/TestVerify/check_verify\',\'\',\'\')}" method="post"> <table> <tr> <td>验证码:</td> <td><input type="text" name="verify"></td> <td> <img id="verify" src="{:U(\'Home/TestVerify/verify\',\'\',\'\')}" style="cursor: pointer;" alt=""><a id="refresh" href="javascript:void(0)">更换验证码</a></td> </tr> <tr> <td colspan="2"> <input type="submit" value="提交"> </td> </tr> </table> </form> </body> <script> $(function(){ $src = $("#verify").attr(\'src\'); $("#refresh").click(function(){ change_verify(); }); $("#verify").click(function(){ change_verify(); }); function change_verify() { $(\'#verify\').attr(\'src\', $src + \'?\' + Math.random()); } }); </script> </html>
效果:
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