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<?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
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