验证码常用于登陆页面、留言页面、注册页面,验证码的原理很简单:利用GD库创建一个图片,图片当然要加上必要的干扰码,然后在服务器端存入SESSION,等用户提交的时候判断session是否相同.
支持中文字母数字、自定义字体php验证码程序代码如下:
- <?php
- /*
- * Captcha Class base on PHP GD Lib
- * @author Design
- * @version 1.0
- * @copyright js8.in 2010
- * @demo
- * include('captchaClass.php');
- * $captchaDemo=new Captcha();
- * $captchaDemo->createImage();
- */
- class Captcha{
- //@定义验证码图片高度
- private $height;
- //@定义验证码图片宽度
- private $width;
- //@定义验证码字符个数
- private $textNum;
- //@定义验证码字符内容
- private $textContent;
- //@定义字符颜色
- private $fontColor;
- //@定义随机出的文字颜色
- private $randFontColor;
- //@定义字体大小
- private $fontSize;
- //@定义字体
- private $fontFamily;
- //@定义背景颜色
- private $bgColor;
- //@定义随机出的背景颜色
- private $randBgColor;
- //@定义字符语言
- private $textLang;
- //@定义干扰点数量
- private $noisePoint;
- //@定义干扰线数量
- private $noiseLine;
- //@定义是否扭曲
- private $distortion;
- //@定义扭曲图片源
- private $distortionImage;
- //@定义是否有边框
- private $showBorder;
- //@定义验证码图片源
- private $image;
- //@Constructor 构造函数
- public function Captcha(){
- $this->textNum=4;
- $this->fontSize=16;
- $this->fontFamily='c:/windows/fontsSIMYOU.ttf';//设置中文字体,可以改成linux的目录
- $this->textLang='en';
- $this->noisePoint=30;
- $this->noiseLine=3;
- $this->distortion=false;
- $this->showBorder=false;
- }
- //@设置图片宽度
- public function setWidth($w){
- $this->width=$w;
- }
- //@设置图片高度
- public function setHeight($h){
- $this->height=$h;
- }
- //@设置字符个数
- public function setTextNumber($textN){
- $this->textNum=$textN;
- }
- //@设置字符颜色
- public function setFontColor($fc){
- $this->fontColor=sscanf($fc,'#%2x%2x%2x');
- }
- //@设置字号
- public function setFontSize($n){
- $this->fontSize=$n;
- }
- //@设置字体
- public function setFontFamily($ffUrl){
- $this->fontFamily=$ffUrl;
- }
- //@设置字符语言
- public function setTextLang($lang){
- $this->textLang=$lang;
- }
- //@设置图片背景
- public function setBgColor($bc){
- $this->bgColor=sscanf($bc,'#%2x%2x%2x');
- }
- //@设置干扰点数量
- public function setNoisePoint($n){
- $this->noisePoint=$n;
- }
- //@设置干扰线数量
- public function setNoiseLine($n){
- $this->noiseLine=$n;
- }
- //@设置是否扭曲
- public function setDistortion($b){
- $this->distortion=$b;
- }
- //@设置是否显示边框
- public function setShowBorder($border){
- $this->showBorder=$border;
- }
- //@初始化验证码图片
- public function initImage(){
- if(emptyempty($this->width)){$this->width=floor($this->fontSize*1.3)*$this->textNum+10;}
- if(emptyempty($this->height)){$this->height=$this->fontSize*2;}
- $this->image=imagecreatetruecolor($this->width,$this->height);
- if(emptyempty($this->bgColor)){
- $this->randBgColor=imagecolorallocate($this->image,mt_rand(100,255),mt_rand(100,255),mt_rand(100,255));
- }else{
- $this->randBgColor=imagecolorallocate($this->image,$this->bgColor[0],$this->bgColor[1],$this->bgColor[2]);
- }
- imagefill($this->image,0,0,$this->randBgColor);
- }
- //@产生随机字符
- public function randText($type){
- $string='';
- switch($type){
- case 'en':
- $str='ABCDEFGHJKLMNPQRSTUVWXY3456789';
- for($i=0;$i<$this->textNum;$i++){
- $string=$string.','.$str[mt_rand(0,29)];
- }
- break;
- case 'cn':
- for($i=0;$i<$this->textNum;$i++) {
- $string=$string.','.chr(rand(0xB0,0xCC)).chr(rand(0xA1,0xBB));
- }
- $string=iconv('GB2312','UTF-8',$string); //转换编码到utf8
- break;
- }
- return substr($string,1);
- }
- //@输出文字到验证码
- public function createText(){
- $textArray=explode(',',$this->randText($this->textLang));
- $this->textContent=join('',$textArray);
- if(emptyempty($this->fontColor)){
- $this->randFontColor=imagecolorallocate($this->image,mt_rand(0,100),mt_rand(0,100),mt_rand(0,100));
- }else{
- $this->randFontColor=imagecolorallocate($this->image,$this->fontColor[0],$this->fontColor[1],$this->fontColor[2]);
- }
- for($i=0;$i<$this->textNum;$i++){
- $angle=mt_rand(-1,1)*mt_rand(1,20);
- imagettftext($this->image,$this->fontSize,$angle,5+$i*floor($this->fontSize*1.3),floor($this->height*0.75),$this->randFontColor,$this->fontFamily,$textArray[$i]);
- }
- }
- //@生成干扰点
- public function createNoisePoint(){
- for($i=0;$i<$this->noisePoint;$i++){
- $pointColor=imagecolorallocate($this->image,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255));
- imagesetpixel($this->image,mt_rand(0,$this->width),mt_rand(0,$this->height),$pointColor);
- }
- }
- //@产生干扰线
- public function createNoiseLine(){
- for($i=0;$i<$this->noiseLine;$i++) {
- $lineColor=imagecolorallocate($this->image,mt_rand(0,255),mt_rand(0,255),20);
- imageline($this->image,0,mt_rand(0,$this->width),$this->width,mt_rand(0,$this->height),$lineColor);
- }
- }
- //@扭曲文字
- public function distortionText(){
- $this->distortionImage=imagecreatetruecolor($this->width,$this->height);
- imagefill($this->distortionImage,0,0,$this->randBgColor);
- for($x=0;$x<$this->width;$x++){
- for($y=0;$y<$this->height;$y++){
- $rgbColor=imagecolorat($this->image,$x,$y);
- imagesetpixel($this->distortionImage,(int)($x+sin($y/$this->height*2*M_PI-M_PI*0.5)*3),$y,$rgbColor);
- }
- }
- $this->image=$this->distortionImage;
- }
- //@生成验证码图片
- public function createImage(){
- $this->initImage(); //创建基本图片
- $this->createText(); //输出验证码字符
- if($this->distortion){$this->distortionText();} //扭曲文字
- $this->createNoisePoint(); //产生干扰点
- $this->createNoiseLine(); //产生干扰线
- if($this->showBorder){imagerectangle($this->image,0,0,$this->width-1,$this->height-1,$this->randFontColor);} //添加边框
- imagepng($this->image);
- imagedestroy($this->image);
- if($this->distortion){imagedestroy($this->$distortionImage);}
- return $this->textContent;
- }//开源代码Vevb.com
- }
- ?>
- //使用方法:
- <?php
- //session_start();
- header("Content-type:image/png");
- include('captcha5_class.php');
- $captcha5=new Captcha();
- //@设置验证码宽度
- //$captcha5->setWidth(200);
- //@设置验证码高度
- //$captcha5->setHeight(50);
- //@设置字符个数
- $captcha5->setTextNumber(5);
- //@设置字符颜色
- //$captcha5->setFontColor('#ff9900');
- //@设置字号大小
- //$captcha5->setFontSize(25);
- //@设置字体
- $captcha5->setFontFamily('c:/windows/fonts/STXINGKA.TTF');
- //@设置语言
- $captcha5->setTextLang('cn');
- //@设置背景颜色
- //$captcha5->setBgColor('#000000');
- //@设置干扰点数量
- //$captcha5->setNoisePoint(600);
- //@设置干扰线数量
- //$captcha5->setNoiseLine(10);
- //@设置是否扭曲
- //$captcha5->setDistortion(true);
- //@设置是否显示边框
- $captcha5->setShowBorder(true);
- //输出验证码
- $code=$captcha5->createImage();
- //$_SESSION['captchaCode']['content']=$code;
- //$_SESSION['captchaCode']['time']=microtime();
- ?>
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