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;
}
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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;
$Verify->entry_add();
}
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验证方法：
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if (!check_verify($verify,'','add')) {
$this->error('验证码错误！');
return;
}
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调用的公共方法：
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// 检测输入的验证码是否正确，$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);
}
}
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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