File: /www/wwwroot/dd.cwoyt.com/ThinkPHP/Library/COM/Verify.class.php
<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2013 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: 赛脑 <2233759493@qq.com> <http://www.sn.com>
// +----------------------------------------------------------------------
namespace COM;
class Verify {
public $seKey = 'ThinkPHP.CN'; //验证码加密密钥
public $expire = 1800; // 验证码过期时间（s）
public $useZh = false; // 使用中文验证码
public $useImgBg = false; // 使用背景图片
public $fontSize = 25; // 验证码字体大小(px)
public $useCurve = true; // 是否画混淆曲线
public $useNoise = true; // 是否添加杂点
public $imageH = 0; // 验证码图片宽
public $imageL = 0; // 验证码图片长
public $length = 5; // 验证码位数
public $fontttf = ''; // 验证码字体，不设置随机获取
public $bg = array(243, 251, 254); // 背景
/**
* 验证码中使用的字符，01IO容易混淆，建议不用
*
* @var string
*/
private $_codeSet = '2345678abcdefhijkmnpqrstuvwxyzABCDEFGHJKLMNPQRTUVWXY';
private $_image = NULL; // 验证码图片实例
private $_color = NULL; // 验证码字体颜色
/**
* 验证验证码是否正确
*
* @param string $code 用户验证码
* @return bool 用户验证码是否正确
*/
public function check($code, $id = '') {
$key = $this->authcode($this->seKey);
// 验证码不能为空
$session = session($key);
if(empty($code) || empty($session)) {
return false;
}
$secode = $id ? $session[$id] : $session;
// session 过期
if(NOW_TIME - $secode['time'] > $this->expire) {
session($key, null);
return false;
}
if($this->authcode(strtoupper($code)) == $secode['code']) {
session($key, null);
return true;
}
return false;
}
/**
* 输出验证码并把验证码的值保存的session中
* 验证码保存到session的格式为： array('code' => '验证码值', 'time' => '验证码创建时间');
*/
public function entry($id = '') {
// 图片宽(px)
$this->imageL || $this->imageL = $this->length*$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->imageL x $this->imageH 的图像
$this->_image = imagecreate($this->imageL, $this->imageH);
// 设置背景
imagecolorallocate($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
$codeNX = 0; // 验证码第N个字符的左边距
for ($i = 0; $i<$this->length; $i++) {
if($this->useZh) {
$code[$i] = chr(mt_rand(0xB0,0xF7)).chr(mt_rand(0xA1,0xFE));
} else {
$code[$i] = $this->_codeSet[mt_rand(0, 51)];
$codeNX += mt_rand($this->fontSize*1.2, $this->fontSize*1.6);
// 写一个验证码字符
$this->useZh || imagettftext($this->_image, $this->fontSize, mt_rand(-40, 40), $codeNX, $this->fontSize*1.6, $this->_color, $this->fontttf, $code[$i]);
}
}
$this->useZh && imagettftext($this->_image, $this->fontSize, 0, ($this->imageL - $this->fontSize*$this->length*1.2)/3, $this->fontSize * 1.5, $this->_color, $this->fontttf, iconv("GB2312","UTF-8", join('', $code)));
// 保存验证码
$key = $this->authcode($this->seKey);
$code = $this->authcode(strtoupper(implode('', $code)));
$session = array();
if($id) {
$session[$id]['code'] = $code; // 把校验码保存到session
$session[$id]['time'] = NOW_TIME; // 验证码创建时间
} else {
$session['code'] = $code; // 把校验码保存到session
$session['time'] = NOW_TIME; // 验证码创建时间
}
session($key, $session);
header('Cache-Control: private, max-age=0, no-store, no-cache, must-revalidate');
header('Cache-Control: post-check=0, pre-check=0', false);
header('Pragma: no-cache');
header("content-type: image/png");
// 输出图像
imagepng($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->imageL*2); // 周期
$w = (2* M_PI)/$T;
$px1 = 0; // 曲线横坐标起始位置
$px2 = mt_rand($this->imageL/2, $this->imageL * 0.8); // 曲线横坐标结束位置
for ($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->imageL*2); // 周期
$w = (2* M_PI)/$T;
$b = $py - $A * sin($w*$px + $f) - $this->imageH/2;
$px1 = $px2;
$px2 = $this->imageL;
for ($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);
$i--;
}
}
}
}
/**
* 画杂点
* 往图片上写不同颜色的字母或数字
*/
private function _writeNoise() {
for($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->imageL), mt_rand(-10, $this->imageH), $this->_codeSet[mt_rand(0, 27)], $noiseColor);
}
}
}
/**
* 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__).'/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->imageL, $this->imageH, $width, $height);
@imagedestroy($bgImage);
}
/* 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);
}
}