支持中文字母数字、自定义字体php验证码代码

<?php
/*
*CaptchaClassbaseonPHPGDLib
*@authorDesign
*@version1.0
*@demo
*include("captchaClass.php");
*$captchaDemo=newCaptcha();
*$captchaDemo->createImage();
*/
classCaptcha{
//@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
publicfunctionCaptcha(){
$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
publicfunctionsetWidth($w){
$this->width=$w;
}

//@设置图片高度
publicfunctionsetHeight($h){
$this->height=$h;
}

//@设置字符个数
publicfunctionsetTextNumber($textN){
$this->textNum=$textN;
}

//@设置字符颜色
publicfunctionsetFontColor($fc){
$this->fontColor=sscanf($fc,"#%2x%2x%2x");
}

//@设置字号
publicfunctionsetFontSize($n){
$this->fontSize=$n;
}

//@设置字体
publicfunctionsetFontFamily($ffUrl){
$this->fontFamily=$ffUrl;
}

//@设置字符语言
publicfunctionsetTextLang($lang){
$this->textLang=$lang;
}

//@设置图片背景
publicfunctionsetBgColor($bc){
$this->bgColor=sscanf($bc,"#%2x%2x%2x");
}

//@设置干扰点数量
publicfunctionsetNoisePoint($n){
$this->noisePoint=$n;
}

//@设置干扰线数量
publicfunctionsetNoiseLine($n){
$this->noiseLine=$n;
}

//@设置是否扭曲
publicfunctionsetDistortion($b){
$this->distortion=$b;
}

//@设置是否显示边框
publicfunctionsetShowBorder($border){
$this->showBorder=$border;
}

//@初始化验证码图片
publicfunctioninitImage(){
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);
}

//@产生随机字符
publicfunctionrandText($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;
}
returnsubstr($string,1);
}

//@输出文字到验证码
publicfunctioncreateText(){
$textArray=explode(",",$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]);
}
}

//@生成干扰点
publicfunctioncreateNoisePoint(){
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
publicfunctioncreateNoiseLine(){
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
publicfunctiondistortionText(){
$this->distortionImage=imagecreatetruecolor($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
publicfunctioncreateImage(){
$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：

<?php
//session_start();
header("Content-type:image/png");
include("captcha5_class.php");
$captcha5=newCaptcha();

//@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();
?>