PHP编写的图片验证码类文件分享

<?php /*  * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */Class Image{     private $img;  public $width = 85;  public $height = 25;  public $code;  public $code_len = 4;  public $code_str = "329832983DSDSKDSLKQWEWQ2lkfDSFSDjfdsfdsjwlkfj93290KFDSKJFDSOIDSLK";  public $bg_color = '#DCDCDC';  public $font_size = 16;  public $font = 'font.ttf';  public $font_color = '#000000';     //创建验证码饿字符创  public function create_code(){    $code = '';    for( $i=0;$i<$this->code_len;$i++ ){      $code .= $this->code_str[mt_rand(0, strlen($this->code_str)-1)];  }    return $this->code = $code;  }     //输出图像  public function getImage(){    $w = $this->width;    $h = $this->height;    $bg_color = $this->bg_color;    $img = imagecreatetruecolor($w, $h);    $bg_color = imagecolorallocate($img,   hexdec(substr($bg_color, 1,2)), hexdec(substr($bg_color, 3,2)), hexdec(substr($bg_color, 5,2)));  imagefill($img, 0, 0, $bg_color);    $this->img = $img;    $this->create_font();    $this->create_pix();  $this->show_code();  }    //写入验证码  public function create_font(){    $this->create_code();    $color = $this->font_color;    $font_color = imagecolorallocate($this->img, hexdec(substr($color,1,2)), hexdec(substr($color, 3,2)), hexdec(substr($color,5,2)));    $x = $this->width/$this->code_len;    for( $i=0;$i<$this->code_len;$i++ ){      $txt_color = imagecolorallocate($this->img, mt_rand(0,100), mt_rand(0, 150), mt_rand(0, 200));      imagettftext($this->img, $this->font_size, mt_rand(-30, 30), $x*$i+mt_rand(3, 6), mt_rand($this->height/1.2, $this->height), $txt_color, $this->font , $this->code[$i]);       //imagestring($this->img, $this->font_size, $x*$i+mt_rand(3, 6),mt_rand(0, $this->height/4) , $this->code[$i], $font_color);    }    $this->font_color = $font_color;  }     //画干扰线  public function create_pix(){    $pix_color= $this->font_color;    for($i=0;$i<100;$i++){      imagesetpixel($this->img, mt_rand(0, $this->width),mt_rand(0, $this->height), $pix_color);    }    for($j=0;$j<4;$j++){      imagesetthickness($this->img, mt_rand(1, 2));      imageline($this->img, mt_rand(0, $this->width), mt_rand(0, $this->height), mt_rand(0, $this->width), mt_rand(0, $this->height), $pix_color);    }  }     //得到验证码  public function getCode(){    return strtoupper($this->code);  }    //输出验证码  private function show_code(){    header("Content-type:image/png");    imagepng($this->img);    imagedestroy($this->img);  }}

<?php/** * 图片验证码类 * 生成图片类型验证码，验证码包含数字和大写字母，session中存放md5加密后的验证码 *  * 使用方法： * $captcha = new Catpcha(); * $captcha->buildAndExportImage(); *  * 作     者: luojing * 创建时间: 2013-3-27 上午11:42:12 */class Captcha {		private $width;//宽度	private $height; //高度	private $codeNum;//验证码字符数量	private $image;//验证码图像资源	private $sessionKey;//session中保存的名字	private $captcha;//验证码字符串	const charWidth = 10;//单个字符宽度,根据输出字符大小而变		/**	 * 创建验证码类，初始化相关参数	 * @param $width 图片宽度	 * @param $height 图片高度	 * @param $codeNum 验证码字符数量	 * @param $sessionKey session中保存的名字	 */	function __construct($width = 50, $height = 20, $codeNum = 4, $sessionKey = 'captcha') {		$this->width = $width;		$this->height = $height;		$this->codeNum = $codeNum;		$this->sessionKey = $sessionKey;				//保证最小高度和宽度		if($height < 20) {			$this->height = 20;		}		if($width < ($codeNum * self::charWidth + 10)) {//左右各保留5像素空隙			$this->width = $codeNum * self::charWidth + 10;		}	}		/**	 * 构造并输出验证码图片	 */	public function buildAndExportImage() {		$this->createImage();		$this->setDisturb();		$this->setCaptcha();		$this->exportImage();	}		/**	 * 构造图像，设置底色	 */	private function createImage() {		//创建图像		$this->image = imagecreatetruecolor($this->width, $this->height); 		//创建背景色		$bg = imagecolorallocate($this->image, mt_rand(220, 255), mt_rand(220, 255), mt_rand(220, 255)); 		//填充背景色		imagefilledrectangle($this->image, 0, 0, $this->width - 1, $this->height - 1, $bg);	}		/**	 * 设置干扰元素	 */	private function setDisturb() {				//设置干扰点		for($i = 0; $i < 150; $i++) {			$color = imagecolorallocate($this->image, mt_rand(150, 200), mt_rand(150, 200), mt_rand(150, 200));			imagesetpixel($this->image, mt_rand(5, $this->width - 10), mt_rand(5, $this->height - 3), $color);		}				//设置干扰线		for($i = 0; $i < 10; $i++) {			$color = imagecolorallocate($this->image, mt_rand(150, 220), mt_rand(150, 220), mt_rand(150, 220));			imagearc($this->image, mt_rand(-10, $this->width), mt_rand(-10, $this->height), mt_rand(30, 300), mt_rand(20, 200), 55, 44, $color);		}				//创建边框色		$border = imagecolorallocate($this->image, mt_rand(0, 50), mt_rand(0, 50), mt_rand(0, 50));		//画边框		imagerectangle($this->image, 0, 0, $this->width - 1, $this->height - 1, $border);	}		/**	 * 产生并绘制验证码	 */	private function setCaptcha() {		$str = '23456789ABCDEFGHJKLMNPQRSTUVWXYZ';		//生成验证码字符		for($i = 0; $i < $this->codeNum; $i++) {			$this->captcha .= $str{mt_rand(0, strlen($str) - 1)};		}		//绘制验证码		for($i = 0; $i < strlen($this->captcha); $i++) {			$color = imagecolorallocate($this->image, mt_rand(0, 200), mt_rand(0, 200), mt_rand(0, 200));			$x = floor(($this->width - 10)/$this->codeNum);			$x = $x*$i + floor(($x-self::charWidth)/2) + 5;			$y = mt_rand(2, $this->height - 20);			imagechar($this->image, 5, $x, $y, $this->captcha{$i}, $color);		}	}		/*	 * 输出图像,验证码保存到session中	 */	private function exportImage() {		if(imagetypes() & IMG_GIF){			header('Content-type:image/gif');			imagegif($this->image);		} else if(imagetypes() & IMG_PNG){			header('Content-type:image/png');      	imagepng($this->iamge);		} else if(imagetypes() & IMG_JPEG) {			header('Content-type:image/jpeg');      	imagepng($this->iamge);		} else {			imagedestroy($this->image);			die("Don't support image type!");		}		//将验证码信息保存到session中，md5加密		if(!isset($_SESSION)){  		session_start();		} 		$_SESSION[$this->sessionKey] = md5($this->captcha);		    imagedestroy($this->image); 	}		function __destruct() {		unset($this->width, $this->height, $this->codeNum,$this->captcha);	}}

<?php class ValidationCode { private $width; private $height; private $codeNum; private $image;  //图像资源 private $disturbColorNum; private $checkCode; function __construct($width=80, $height=20, $codeNum=4){  $this->width=$width;  $this->height=$height;  $this->codeNum=$codeNum;  $this->checkCode=$this->createCheckCode();  $number=floor($width*$height/15);   if($number > 240-$codeNum){  $this->disturbColorNum= 240-$codeNum;  }else{  $this->disturbColorNum=$number;  }  } //通过访问该方法向浏览器中输出图像 function showImage($fontFace=""){  //第一步：创建图像背景  $this->createImage();  //第二步：设置干扰元素  $this->setDisturbColor();  //第三步：向图像中随机画出文本  $this->outputText($fontFace);  //第四步：输出图像  $this->outputImage(); }  //通过调用该方法获取随机创建的验证码字符串 function getCheckCode(){  return $this->checkCode; } private function createImage(){  //创建图像资源  $this->image=imagecreatetruecolor($this->width, $this->height);  //随机背景色  $backColor=imagecolorallocate($this->image, rand(225, 255), rand(225,255), rand(225, 255));  //为背景添充颜色  imagefill($this->image, 0, 0, $backColor);  //设置边框颜色  $border=imagecolorallocate($this->image, 0, 0, 0);  //画出矩形边框  imagerectangle($this->image, 0, 0, $this->width-1, $this->height-1, $border); } private function setDisturbColor(){  for($i=0; $i<$this->disturbColorNum; $i++){  $color=imagecolorallocate($this->image, rand(0, 255), rand(0, 255), rand(0, 255));  imagesetpixel($this->image, rand(1, $this->width-2), rand(1, $this->height-2), $color);  }  for($i=0; $i<10; $i++){  $color=imagecolorallocate($this->image, rand(200, 255), rand(200, 255), rand(200, 255));  imagearc($this->image, rand(-10, $this->width), rand(-10, $this->height), rand(30, 300), rand(20, 200), 55, 44, $color);  } } private function createCheckCode(){//这里主要产生随机码，从2开始是为了区分1和l  $code="23456789abcdefghijkmnpqrstuvwxyzABCDEFGHIJKMNPQRSTUVWXYZ";  $string='';  for($i=0; $i < $this->codeNum; $i++){  $char=$code{rand(0, strlen($code)-1)};  $string.=$char;  }  return $string; } private function outputText($fontFace=""){  for($i=0; $i<$this->codeNum; $i++){  $fontcolor=imagecolorallocate($this->image, rand(0, 128), rand(0, 128), rand(0, 128));  if($fontFace==""){   $fontsize=rand(3, 5);   $x=floor($this->width/$this->codeNum)*$i+3;   $y=rand(0, $this->height-15);   imagechar($this->image,$fontsize, $x, $y, $this->checkCode{$i},$fontcolor);  }else{   $fontsize=rand(12, 16);   $x=floor(($this->width-8)/$this->codeNum)*$i+8;   $y=rand($fontSize+5, $this->height);   imagettftext($this->image,$fontsize,rand(-30, 30),$x,$y ,$fontcolor, $fontFace, $this->checkCode{$i});  }  } } private function outputImage() {  if(imagetypes() & IMG_GIF){  header("Content-Type:image/gif");  imagepng($this->image);  }else if(imagetypes() & IMG_JPG){  header("Content-Type:image/jpeg");  imagepng($this->image);  }else if(imagetypes() & IMG_PNG){  header("Content-Type:image/png");  imagepng($this->image);  }else if(imagetypes() & IMG_WBMP){  header("Content-Type:image/vnd.wap.wbmp");  imagepng($this->image);  }else{  die("PHP不支持图像创建");  } } function __destruct(){  imagedestroy($this->image); } } 

<?phpsession_start();include "validationcode.class.php";$code=new ValidationCode(80, 20, 4);$code->showImage();  //输出到页面中供 注册或登录使用$_SESSION["code"]=$code->getCheckCode(); //将验证码保存到服务器中