原生态字模生成变形错位的图片验证码

一年又过去了，在这最后回家之前留下最后的手印
原本是为了破解12306.cn的验证码,经过一翻奋斗,还是只处于研究状态，一直没有下手，时间不多，烦心的事多，所以静不下来弄.（来年了，就着手这个了，为了来年能够用自己的程序买到火车票）
机原巧合，在破解图片的时候，想到自己之前写的图片验证码真是弱爆了，所以现在从不容易被人破解的角度重新写了此程序:
主要功能
1.生成字模(在生成字符串字模后，就不需要字体文件)
2.图片中字符旋转和交错
代码在此:（欢迎大家一起来讨论研究更好的实现方法）
原文地址: http://www.onlypo.com/archives/139

<?php

/****

 * @auth: Buty

 * @data: 2012-1-12

 * @Func: 生成随机变形的验证码

 * 准备工作: 

  	    1.创建字模数组	$captcha = new Captcha;

 		       			$captcha->createZiMo();

        生成验证码:

   						$captcha->displayCaptcha();

 */

class Captcha {

	private $words = '123456789ABCDEFGHIJKLNPQRSTUVXYZ';

	private $width = 25;  //字模宽度

	private $height = 25; //字模高度

	private $img;

	private $text_color;  //文字颜色

	public  $zimo_dir = 'zimopics/'; //字模生成文件目录

	private $suffix = '.jpg'; //字模图片

	public  $zimo_file = 'zimo.php'; //字模数组文件

	private $zimo = NULL;

	private $font_file = 'arial.ttf';//ttf字体文件, 生成字模图片时必须的,在系统中随便找一个

	//初始化画布

	public function Captcha() {

		$width = 120;

		$height = 50;

		if(!extension_loaded('gd')) { //需要gd扩展的支持

			exit('GD extension is supported,please load GD extension and go on.');

		}

		$this->img = imagecreatetruecolor($width, $height);

		$this->text_color = imagecolorallocate($this->img, 0, 0, 255);

		$bg_color = imagecolorallocate($this->img, 255, 255, 255);

		ImageFilledRectangle($this->img, 0, 0, $width, $height, $bg_color);

	}

	//保存验证码到session, 对于不同存储验证码的手段,此方法直接重写

	function saveCode($code) {

		session_start();

		$_SESSION['code'] = implode('',$code);

		setcookie('code', $_SESSION['code']);

	}

	//产生验证码

	private function productNum($len) {

		$num = array();

		$total_len = strlen($this->words);

		for($i = 0; $i < $len; $i++) {

			$index = mt_rand(0, ($total_len - 1));

			$num[]= $this->words[$index];

		} 

		return $num;

	}

	//显示验证码

	function displayCaptcha($len = 4) {

		if(empty($len)) $len = 4;

		$code = $this->productNum($len);

		foreach($code as $k => $v) {

			$this->addZiMo($v, $k * $this->width);

		}

		//保存验证码到session

		$this->saveCode($code);

		//输出图片

		$this->showNewPic();

	}

	//添加新字模到图片

	function addZiMo($str, $width=0) {

		if(!$this->zimo) {

			$this->loadZiMo();

		}

		$str = strtoupper($str);

		if(isset($this->zimo[$str])) {

			$this->rotateZiMo($this->zimo[$str],$width);

		}

	}

	//加载字模数据

	function loadZiMo() {

		if(is_file($this->zimo_dir . $this->zimo_file)) {

			$this->zimo = include $this->zimo_dir . $this->zimo_file;

			//解析字模点阵

			$this->zimo = $this->strToArray($this->zimo);

		} else {

			exit('Zimo file not exists, please use method `createZiMo` create Zimo file.');

		}

	}

	//旋转字模打点

	function rotateZiMo($data, $width=0) {

		$angle = $this->randAngle(); //角度随机

		$width = $this->randDistance($width);//距离随机

 

		foreach($data as $i => $v) {

			foreach($v as $j => $vs) {

				if(!$vs) {

					$jindex = $j+$width;

					$res = $this->circleCoord($width,0,$jindex,-$i, $angle);

					$new_i = floor(abs($res['y']));

					$new_j = floor(abs($res['x']));

					imagesetpixel($this->img, $new_j, $new_i, $this->text_color);

				}

			}

		}

		return $data;

	}

	//角度变换

	function randAngle() {

		return mt_rand(-15,15); //角度随机

	}

	//距离变换

	function randDistance($width) {

		return $width + mt_rand(15,20); //距离随机

	}

	//根据圆心坐标,圆上一点坐标,角度,计算另一坐标

	function circleCoord($x0,$y0,$x1,$y1,$angle) {

		$r = sqrt(($x1 - $x0)*($x1 - $x0) + ($y1 - $y0)*($y1 - $y0));

		$arc = ($x1 - $x0) / $r;

		$angle0_rad = acos($arc);

		$angle0_rad = rad2deg($angle0_rad);

		$angle_new = $angle0_rad + $angle;

		$new_x = $x0 + $r * cos(deg2rad($angle_new));

		$new_y = $y0 + $r * sin(deg2rad($angle_new));

		return array('x' => $new_x, 'y' => $new_y);

	}

 

/*****************************************自行创建字模图片与字模数组文件********************************/	

	//创建字模图片

	function createZiMoPic($words = '') {

		if(!file_exists($this->font_file)) {  //字体需要存在

			exit('Font file no exists.');

		}

		$this->checkDoc(); //如果目录不存在,自动生成

		if(empty($words)) $words = $this->words;

		for($i = 0; $i < strlen($words); $i++) {

			$num = $words[$i];

			$height = 25; //高度

			$width = 25; //一个字符宽度

			$font_size = 25; //字体大小

			$font = $this->font_file; //ttf字体

			$x = 0;

			$y = 0;

			$angle = 0;

			$img = imagecreatetruecolor($width, $height);

			$text_color = imagecolorallocate($img, 0, 0, 255);

			$bg_color = imagecolorallocate($img, 255, 255, 255);

			//其左上角坐标为 x，y

			ImageFilledRectangle($img, $x, $y, $width, $height, $bg_color);

			//由 x，y 所表示的坐标定义了第一个字符的基本点（大概是字符的左下角）

			imagettftext($img, $font_size, $angle, $x, $height, $text_color, $font, $num);

			ImageJPEG($img, $this->zimo_dir . strtoupper($num) . $this->suffix);

			imagedestroy($img);

		}

	}

	//检测目录是否存在,不存在创建

	function checkDoc() {

		if(!is_dir($this->zimo_dir)) {

			mkdir($this->zimo_dir,0777,true);

		}

	}

	//创建字模

	function createZiMo($words = '') {

		if(empty($words)) $words = $this->words;

		$this->createZiMoPic($words);

		$data = array();

		if(is_dir($this->zimo_dir)) {

			if($dp = opendir($this->zimo_dir)) {

				while (($file = readdir($dp)) !== false) {

					if($file != '.' && $file != '..' && $this->suffix == strrchr($file, '.')) {

						$key = substr($file, 0, -strlen($this->suffix));

			            $value = $this->createZiMoDot($this->zimo_dir . $file);

						$data[$key] = $value;

					}

		        }

		        closedir($dp);

			}

		}

		$data = $this->arrayToStr($data);

		$this->writeZiMoFile($data);

	}

	//写入字模文件

	function writeZiMoFile($data) {

		$fp = fopen($this->zimo_dir . $this->zimo_file, 'w');

		$data = $this->stripWhiteEnter(var_export($data, true));

		fwrite($fp, "<?php\r\nreturn ".$data."\r\n?>");

		fclose($fp);

	}

	//将三维数组改写成字符串

	function arrayToStr($data) {

		foreach($data as $k => $v) {

			$str = '';

			foreach($v as $sk => $sv) {

				foreach($sv as $ssk => $ssv) {

					$str .= $ssv;

				}

			}

			unset($data[$k]);

			$data[$k] = $str;

		}

		return $data;

	}

	//将一维数组按规律改写成三维数组

	function strToArray($data) {

		$cut_words = 25; //将字符串切成25个小数组

		foreach($data as $k => $v) {

			unset($data[$k]);

			$strlens = strlen($v);

			for($i = 0; $i < $strlens; $i++) {

				$secindex = floor($i/$cut_words);

				$data[$k][$secindex][] = $v[$i];

			}

		}

 

		return $data;

	}

	// 去除代码中的空白和换行

	function stripWhiteEnter($content) {

	    $stripword = array(' ','\t',"\r","\n","\r\n");

		$content = str_replace($stripword,"",$content);

	    return $content;

	}

	//生成字模点阵

	function createZiMoDot($picfile) {

		$res = imagecreatefromjpeg($picfile);

		$size = getimagesize($picfile);

		$data = array();

		for($i=0; $i < $size[1]; ++$i) {

			for($j=0; $j < $size[0]; ++$j) {

				$rgb = imagecolorat($res,$j,$i);

				$rgbarray = imagecolorsforindex($res, $rgb);

				if($rgbarray['red'] > 125 || $rgbarray['green']>125) {

					$data[$i][$j]=1;

				} else {

					$data[$i][$j]=0;

				}

			}

		}

		return $data;

	}

	//显示生成的图片

	function showNewPic() {

		header('Content-type: image/jpeg');

		ImageJPEG($this->img);

		imagedestroy($this->img);

	}

}

 

$captcha = new Captcha;

//$captcha->createZiMo();

$captcha->displayCaptcha();

验证码图片如下:

所在文件: http://www.onlypo.com/test/captcha/
查看demo: http://www.onlypo.com/test/captcha/captcha.php