是不是觉得普通的验证码已经没办法满足，接下来介绍如何将tp现有的验证码改为计算型验证码：
首先找到：ThinkPHP\Library\Think\Verify.class.php
在其中加入以下代码：
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public function entry_add($id = '') { $this->length='3'; // 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 $symbol=array('+','-'); $codeNX = 0; // 验证码第N个字符的左边距 $now_symbol=$symbol[rand(0,1)]; for ($i = 0; $i<$this->length; $i++) { if($i==1){ $code[$i] = $now_symbol; $codeNX += mt_rand($this->fontSize*1.2, $this->fontSize*1.6); imagettftext($this->_image, $this->fontSize,0, $codeNX, $this->fontSize*1.6, $this->_color, $ttfPath.'2.ttf', $code[$i]); } else{ $code[$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); $str=implode('', $code); eval("\$re=$str;"); $code = $this->authcode($re); $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($this->_image); } |
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public function check_add($code, $id = '') { $key = $this->authcode($this->seKey).$id; // 验证码不能为空 $secode = session($key); if($code===false || empty($secode)) { return false; } //验证码是否是数字 if(!is_numeric($code)) { return false; } // session 过期 if(NOW_TIME - $secode['verify_time'] > $this->expire) { session($key, null); return false; } if($this->authcode($code) == $secode['verify_code']) { $this->reset && session($key, null); return true; } return false; } |
生成方法：
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Public function verify(){ import('ORG.Util.Verify'); $Verify = new Verify(); $Verify->useNoise = true; $Verify->codeSet = '0123456789'; $Verify->useCurve = false; $Verify->entry_add(); } |
验证方法：
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if (!check_verify($verify,'','add')) { $this->error('验证码错误！'); return; } |
调用的公共方法：
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// 检测输入的验证码是否正确，$code为用户输入的验证码字符串function check_verify($code, $id = '',$type=''){ import('ORG.Util.Verify'); $verify = new Verify(); if($type='add'){ return $verify->check_add($code, $id); } else{ return $verify->check($code, $id); }} |
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：http://www.cnblogs.com/phperyin/archive/2017/02/09/6382305.html
