基于gd库的php验证码类（支持中英文字体、背景、干扰点线、扭曲.......）
<?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 = $border;
}
//@初始化验证码图片
public function initimage()
{
if (empty($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();
?>