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Thinkphp3.2实用篇之计算型验证码示例

更新时间:2020-03-17 22:20:00 作者:startmvc
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

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:


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);
 }


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:


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:


 if (!check_verify($verify,'','add')) {
 $this->error('验证码错误!');
 return;
 }

 调用的公共方法:


 // 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脚本之家。

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