支持中文字母数字、自定义字体php验证码代码

<?php
/*
* captcha class base on php gd lib
* @author design
* @version 1.0
* @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(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
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(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
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;
}

}
?>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();
?>