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
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- class Captcha{
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- private $height;
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- private $width;
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- private $textNum;
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- private $textContent;
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- private $fontColor;
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- private $randFontColor;
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- private $fontSize;
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- private $fontFamily;
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- private $bgColor;
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- private $randBgColor;
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- private $textLang;
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- private $noisePoint;
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- private $noiseLine;
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- private $distortion;
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- private $distortionImage;
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- private $showBorder;
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- private $image;
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- public function Captcha(){
- $this->textNum=4;
- $this->fontSize=16;
- $this->fontFamily='c:\windows\fontsSIMYOU.ttf';
- $this->textLang='en';
- $this->noisePoint=30;
- $this->noiseLine=3;
- $this->distortion=false;
- $this->showBorder=false;
- }
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- public function setWidth($w){
- $this->width=$w;
- }
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- public function setHeight($h){
- $this->height=$h;
- }
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- public function setTextNumber($textN){
- $this->textNum=$textN;
- }
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- public function setFontColor($fc){
- $this->fontColor=sscanf($fc,'#%2x%2x%2x');
- }
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- public function setFontSize($n){
- $this->fontSize=$n;
- }
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- public function setFontFamily($ffUrl){
- $this->fontFamily=$ffUrl;
- }
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- public function setTextLang($lang){
- $this->textLang=$lang;
- }
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- public function setBgColor($bc){
- $this->bgColor=sscanf($bc,'#%2x%2x%2x');
- }
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- public function setNoisePoint($n){
- $this->noisePoint=$n;
- }
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- public function setNoiseLine($n){
- $this->noiseLine=$n;
- }
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- public function setDistortion($b){
- $this->distortion=$b;
- }
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- public function setShowBorder($border){
- $this->showBorder=$border;
- }
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- 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,$this->randBgColor);
- }
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- public function randText($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);
- break;
- }
- return substr($string,1);
- }
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- 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[$i]);
- }
- }
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- public function createNoisePoint(){
- for($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);
- }
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- }
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- 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);
- }
- }
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- 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;
- }
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- public function createImage(){
- $this->initImage();
- $this->createText();
- if($this->distortion){$this->distortionText();}
- $this->createNoisePoint();
- $this->createNoiseLine();
- if($this->showBorder){imagerectangle($this->image,0,0,$this->width-1,$this->height-1,$this->randFontColor);}
- imagepng($this->image);
- imagedestroy($this->image);
- if($this->distortion){imagedestroy($this->$distortionImage);}
- return $this->textContent;
- }
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- }
- ?>
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- <?php
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- header("Content-type:image/png");
- include('captcha5_class.php');
- $captcha5=new Captcha();
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- $captcha5->setTextNumber(5);
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- $captcha5->setFontFamily('c:\windows\fonts\STXINGKA.TTF');
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- $captcha5->setTextLang('cn');
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- $captcha5->setShowBorder(true);
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- $code=$captcha5->createImage();
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- ?>
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