captcha.class.php,Captcha.class.php
defined('IN_MY_PHP') || die(0);
/**
* Captcha Class base on PHP GD Lib
* @author Design
* @version 1.0
* @copyright js8.in 2010
* @example
* $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 __construct()
{
$this->textNum = 4;
$this->fontSize = 16;
$this->fontFamily = rtrim(dirname(__FILE__), DS) . DS . 'captcha-yrd.ttf';
$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 = $border;
}
/** 初始化验证码图片 */
public function initImage()
{
if ($this->width == null) {
$this->width = floor($this->fontSize * 1.3) * $this->textNum + 10;
}
if ($this->height == null) {
$this->height = $this->fontSize * 2;
}
$this->image = imagecreatetruecolor($this->width, $this->height);
if (empty($this->bgColor)) {
$this->randBgColor = imagecolorallocate($this->image, rand(144, 255), rand(144, 255), rand(144, 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 . ',' . $str[rand(0, 29)];
}
break;
case 'cn':
for ($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('', $textArray);
if ($this->fontColor != null) {
$this->randFontColor = imagecolorallocate($this->image, $this->fontColor[0], $this->fontColor[1], $this->fontColor[2]);
}
$_x = $this->width *0.9 / $this->textNum;
$x_offset = $_x / 2 - $this->fontSize * 0.4 + $this->width * 0.05;
$y = ($this->height + $this->fontSize) / 2;
file_put_contents('a.txt',$y );
for ($i = 0; $i < $this->textNum; $i++) {
if ($this->fontColor == null) {
$this->randFontColor = imagecolorallocate($this->image, rand(0, 100), rand(0, 100), rand(0, 100));
}
$angle = (rand(0, 1)==1)? rand(0, 20) : rand(-20, 0);
imagettftext($this->image, $this->fontSize, $angle, $_x * $i + $x_offset, $y, $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, rand(0, 255), rand(0, 255), rand(0, 255));
imagesetpixel($this->image, rand(0, $this->width), rand(0, $this->height), $pointColor);
}
}
/** 产生干扰线 */
public function createNoiseLine()
{
for ($i = 0; $i < $this->noiseLine; $i++) {
$lineColor = imagecolorallocate($this->image, rand(80, 224), rand(80, 224), rand(80, 224));
imageline($this->image, 0, rand(0, $this->width), $this->width, 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);
$scale = (rand(0,1)==1)? rand(1, 3) : rand(-3, -1);
for ($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) * $scale), $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 && is_resource($this->distortion)) {
imagedestroy($this->$distortionImage);
}
return $this->textContent;
}
}
/** 使用方法 */
// $captcha = new Captcha();
/** 设置验证码宽度 */
// $captcha->setWidth(200);
/** 设置验证码高度 */
// $captcha->setHeight(50);
/** 设置字符个数 */
// $captcha->setTextNumber(5);
/** 设置字符颜色 */
// $captcha->setFontColor('#ff9900');
/** 设置字号大小 */
// $captcha->setFontSize(25);
/** 设置字体 */
// $captcha->setFontFamily('c:\windows\fonts\STXINGKA.TTF');
/** 设置语言(中文：cn需要设置中文字体,英文：en) */
// $captcha->setTextLang('cn');
/** 设置背景颜色 */
// $captcha->setBgColor('#000000');
/** 设置干扰点数量 */
// $captcha->setNoisePoint(600);
/** 设置干扰线数量 */
// $captcha->setNoiseLine(10);
/** 设置是否扭曲 */
// $captcha->setDistortion(true);
/** 设置是否显示边框 */
// $captcha->setShowBorder(true);
/** 输出验证码 */
// header("Cache-Control: max-age=1, s-maxage=1, no-cache, must-revalidate");
// header("Content-type: image/png;charset=utf-8");
// $code = $captcha->createImage();
?>
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