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适用于自定义的验证码类!
<?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);}}
我们再来看一例代码:
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
<?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);}}
例三:
<?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); } } 
使用如下:
测试,调用验证码类
code.php

<?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