基于GD庫的php驗證碼類（支持中英文字體、背景、干擾點線、扭曲.......）

程序猿123 9年前發布 | 2K 次閱讀 PHP 驗證碼
<?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
{
 //@定義驗證碼圖片高度
 private $height;
 //@定義驗證碼圖片寬度
 private $width;
 //@定義驗證碼字符個數
 private $textNum;
 //@定義驗證碼字符內容
 private $textContent;
 //@定義字符顏色
 private $fontColor;
 //@定義隨機出的文字顏色
 private $randFontColor;
 //@定義字體大小
 private $fontSize;
 //@定義字體
 private $fontFamily;
 //@定義背景顏色
 private $bgColor;
 //@定義隨機出的背景顏色
 private $randBgColor;
 //@定義字符語言
 private $textLang;
 //@定義干擾點數量
 private $noisePoint;
 //@定義干擾線數量
 private $noiseLine;
 //@定義是否扭曲
 private $distortion;
 //@定義扭曲圖片源
 private $distortionImage;
 //@定義是否有邊框
 private $showBorder;
 //@定義驗證碼圖片源
 private $image;
//@Constructor 構造函數
 public function Captcha()
 {

 $this->textNum    = 4;
 $this->fontSize   = 16;
 $this->fontFamily = 'c:\windows\fontsSIMYOU.ttf'; //設置中文字體，可以改成linux的目錄
 $this->textLang   = 'en';
 $this->noisePoint = 30;
 $this->noiseLine  = 3;
 $this->distortion = false;
 $this->showBorder = false;

}



//@設置圖片寬度
public function setWidth($w)
{
    $this->width = $w;
}

//@設置圖片高度
public function setHeight($h)
{
    $this->height = $h;
}

//@設置字符個數
public function setTextNumber($textN)
{
    $this->textNum = $textN;
}

//@設置字符顏色
public function setFontColor($fc)
{
    $this->fontColor = sscanf($fc, '#%2x%2x%2x');
}

//@設置字號
public function setFontSize($n)
{
    $this->fontSize = $n;
}

//@設置字體
public function setFontFamily($ffUrl)
{
    $this->fontFamily = $ffUrl;
}

//@設置字符語言
public function setTextLang($lang)
{
    $this->textLang = $lang;
}

//@設置圖片背景
public function setBgColor($bc)
{
    $this->bgColor = sscanf($bc, '#%2x%2x%2x');
}

//@設置干擾點數量
public function setNoisePoint($n)
{
    $this->noisePoint = $n;
}

//@設置干擾線數量
public function setNoiseLine($n)
{
    $this->noiseLine = $n;
}

//@設置是否扭曲
public function setDistortion($b)
{
    $this->distortion = $b;
}

//@設置是否顯示邊框
public function setShowBorder($border)
{
    $this->showBorder = $border;
}

//@初始化驗證碼圖片
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);
}

//@產生隨機字符
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', $string); //轉換編碼到utf8
            break;
    }
    return substr($string, 1);
}

//@輸出文字到驗證碼
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]);
    }
}

//@生成干擾點
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);
    }

}

//@產生干擾線
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;
}

//@生成驗證碼圖片
public function createImage()
{
    $this->initImage(); //創建基本圖片
    $this->createText(); //輸出驗證碼字符
    if ($this->distortion) {
        $this->distortionText();
    } //扭曲文字
    $this->createNoisePoint(); //產生干擾點
    $this->createNoiseLine(); //產生干擾線
    if ($this->showBorder) {
        imagerectangle($this->image, 0, 0, $this->width - 1, $this->height - 1, $this->randFontColor);
    } //添加邊框
    imagepng($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');
$captcha5 = new Captcha();
//@設置驗證碼寬度
//$captcha5->setWidth(200);
//@設置驗證碼高度
//$captcha5->setHeight(50);
//@設置字符個數
$captcha5->setTextNumber(5);
//@設置字符顏色
//$captcha5->setFontColor('#ff9900');
//@設置字號大小
//$captcha5->setFontSize(25);
//@設置字體
$captcha5->setFontFamily('c:\windows\fonts\STXINGKA.TTF');
//@設置語言
$captcha5->setTextLang('cn');
//@設置背景顏色
//$captcha5->setBgColor('#000000');
//@設置干擾點數量
//$captcha5->setNoisePoint(600);
//@設置干擾線數量
//$captcha5->setNoiseLine(10);
//@設置是否扭曲
//$captcha5->setDistortion(true);
//@設置是否顯示邊框
$captcha5->setShowBorder(true);
//輸出驗證碼
$code = $captcha5->createImage();
//$_SESSION['captchaCode']['content']=$code;
//$_SESSION['captchaCode']['time']=microtime();
?></pre>
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PHP 驗證碼
基于GD庫的php驗證碼類（支持中英文字體、背景、干擾點線、扭曲.......）

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