PHP verification code class based on GD library and supports Chinese and English fonts, backgrounds, interference points, lines, distortions, etc.

PHP verification code class based on GD library (supports Chinese and English fonts, backgrounds, interference points and lines, distortion...)

<?php
/*
* Captcha Class base on PHP GD Lib
* @author Design
* @version 1.0
* @copyright js8.in 2010
* @demo
* include(&#39;captchaClass.php&#39;);
* $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 = &#39;c:\windows\fontsSIMYOU.ttf&#39;; //设置中文字体，可以改成linux的目录
$this->textLang = &#39;en&#39;;
$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, &#39;#%2x%2x%2x&#39;);
}

//@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, &#39;#%2x%2x%2x&#39;);
}

//@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)
{
$string = &#39;&#39;;
switch ($type) {
case &#39;en&#39;:
$str = &#39;ABCDEFGHJKLMNPQRSTUVWXY3456789&#39;;
for ($i = 0; $i < $this->textNum; $i++) {
$string = $string . &#39;,&#39; . $str[mt_rand(0, 29)];
}
break;
case &#39;cn&#39;:
for ($i = 0; $i < $this->textNum; $i++) {
$string = $string . &#39;,&#39; . chr(rand(0xB0, 0xCC)) . chr(rand(0xA1, 0xBB));
}
$string = iconv(&#39;GB2312&#39;, &#39;UTF-8&#39;, $string); //转换编码到utf8
break;
}
return substr($string, 1);
}

//@输出文字到验证码
public function createText()
{
$textArray = explode(&#39;,&#39;, $this->randText($this->textLang));
$this->textContent = join(&#39;&#39;, $textArray);
if (empty($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;
}

}
?>

Usage:

<?php
//session_start();
header("Content-type:image/png");
include(&#39;captcha5_class.php&#39;);
$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(&#39;#ff9900&#39;);

//@设置字号大小
//$captcha5->setFontSize(25);

//@设置字体
$captcha5->setFontFamily(&#39;c:\windows\fonts\STXINGKA.TTF&#39;);

//@设置语言
$captcha5->setTextLang(&#39;cn&#39;);

//@设置背景颜色
//$captcha5->setBgColor(&#39;#000000&#39;);

//@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[&#39;captchaCode&#39;][&#39;content&#39;]=$code;
//$_SESSION[&#39;captchaCode&#39;][&#39;time&#39;]=microtime();
?>