-
-
/**
- * 验证码类
- * edit bbs.it-home.org
- */
- 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 //bbs.it-home.org
- $this->image=imagecreatetruecolor($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; $idisturbColorNum; $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; $i$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 codeNum; $i++){
- $char=$code{rand(0, strlen($code)-1)};
- $string.=$char;
- }
- return $string;
- }
- private function outputText($fontFace=""){
- for($i=0; $icodeNum; $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});
- }
- }
- }
//输出图象信息
- 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); //bbs.it-home.org
- }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);
- }
- }
- ?>
-
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验证码类的调用示例:
-
-
session_start();
- include "validationcode.class.php";
- $code=new ValidationCode(80, 20, 4);
- $code->showImage(); //输出到页面* 注册或登录使用
- $_SESSION["code"]=$code->getCheckCode(); //将验证码保存到服务器中
- ?>
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