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/*
* 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{
//@Define the height of the verification code image
private $height;
//@Define verification code image width
private $width;
//@Define the number of characters in the verification code
private $textNum;
//@Define verification code character content
private $textContent;
//@Define character color
private $fontColor;
//@Define the random text color
private $randFontColor;
//@Define font size
private $fontSize;
//@Define font
private $fontFamily;
//@Define background color
private $bgColor;
//@Define the random background color
private $randBgColor;
//@Define character language
private $textLang;
//@Define the number of interference points
private $noisePoint;
//@Define the number of interference lines
private $noiseLine;
//@Whether the definition is distorted
private $distortion;
//@Define distorted image source
private $distortionImage;
//@Define whether there is a border
private $showBorder;
//@Define verification code image source
private $image;
//@Constructor constructor
public function Captcha(){
$this->textNum=4;
$this->fontSize=16;
$this->fontFamily='c:windowsfontsSIMYOU.ttf';//Set the Chinese font, which can be changed to the Linux directory
$this->textLang='en';
$this->noisePoint=30;
$this->noiseLine=3;
$this->distortion=false;
$this->showBorder=false;
}
//@Set image width
public function setWidth($w){
$this->width=$w;
}
//@Set image height
public function setHeight($h){
$this->height=$h;
}
//@Set the number of characters
public function setTextNumber($textN){
$this->textNum=$textN;
}
//@Set character color
public function setFontColor($fc){
$this->fontColor=sscanf($fc,'#%2x%2x%2x');
}
//@Set font size
public function setFontSize($n){
$this->fontSize=$n;
}
//@Set font
public function setFontFamily($ffUrl){
$this->fontFamily=$ffUrl;
}
//@Set character language
public function setTextLang($lang){
$this->textLang=$lang;
}
//@Set picture background
public function setBgColor($bc){
$this->bgColor=sscanf($bc,'#%2x%2x%2x');
}
//@Set the number of interference points
public function setNoisePoint($n){
$this->noisePoint=$n;
}
//@Set the number of interference lines
public function setNoiseLine($n){
$this->noiseLine=$n;
}
//@Set whether to distort
public function setDistortion($b){
$this->distortion=$b;
}
//@Set whether to display the border
public function setShowBorder($border){
$this->showBorder=$border;
}
//@Initialization verification code picture
public function initImage(){
if(empty($this->width)){$this->width=floor($this->fontSize*1.3)*$this->textNum+10;}
if(empty($this->height)){$this->height=$this->fontSize*2;}
$this->image=imagecreatetruecolor($this->width,$this->height);
if(empty($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,$this->randBgColor);
}
//@Generate random characters
public function randText($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); //Convert encoding to utf8
break;
}
return substr($string,1);
}
//@Output text to verification code
public function createText(){
$textArray=explode(',',$this->randText($this->textLang));
$this->textContent=join('',$textArray);
if(empty($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[$i]);
}
}
//@Generate interference points
public function createNoisePoint(){
for($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);
}
}
//@Generate interference lines
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;
}
}
?>使用方法：
//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:windowsfontsSTXINGKA.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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