ThinkPHP 3.2.3实现加减乘除图片验证码

<?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); } }　　

<?phpnamespace 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(); } }

<!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)" rel="external nofollow" >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>