Gif图片验证码类

新开发的安全验证码类，支持生成Gif图片验证码(带噪点，干扰线，网格，随机色背景，随机自定义字体，倾斜，Gif动画）。

上图：

字体及字体文件的路径需要在类中$FontFilePath及$FontFileName中设置。如：

private static $FontFilePath = "static/font/"; //相对地本代码文件的位置

private static $FontFileName = array("3.ttf");// array("1.ttf", "2.ttf", "3.ttf", "4.ttf", "5.ttf", "6.ttf", "7.ttf", "8.ttf"); //

 

完整代码如下：

<?PHP



/**

  说明: 验证码生成类,支持生成Gif图片验证码(带噪点，干扰线，网格，随机色背景，随机自定义字体，倾斜，Gif动画）

  作者: 茶沫

  时间：2013-10-26

  博客：http://www.cnblogs.com/janas



  服务端：

  $mod = strtolower(isset($_REQUEST["mod"]) ? $_REQUEST["mod"] : "");

  if($mod == "code"){

  echo SecurityCode::Draw(4, 1, 120, 30, 5, 10, 100, "secode");

  die();

  }

  调用: <img src="/getcode.php?mod=code" onclick="this.src='/getcode.php?mod=code&r='+Math.round(Math.random(0)*1000)">

  验证:

  $reqCode = strtolower(isset($_REQUEST["secode"]) ? $_REQUEST["secode"] : "");  //请求的验证码

  $sessionCode = strtolower(isset($_SESSION["secode"]) ? $_SESSION["secode"] : ""); //会话生成的验证码

  if($reqCode != $sessionCode){

  echo "安全验证码错误！";

  die();

  }

 */

$mod = strtolower(isset($_REQUEST["mod"]) ? $_REQUEST["mod"] : "");

if ($mod == "code") {

    echo SecurityCode::Draw(4, 15, 100, 27, 10, 2, 100, "secode");

    die();

}



//安全验证码类

class SecurityCode {



    private static $Debug = 0;

    private static $Code = '';

    private static $Chars = 'bcdefhkmnrstuvwxyABCDEFGHKMNPRSTUVWXY34568';

    //private static $Chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890';

    private static $TextGap = 20;

    private static $TextMargin = 5;

    private static $FontFilePath = "static/font/"; //相对地本代码文件的位置

    private static $FontFileName =array("3.ttf");// array("1.ttf", "2.ttf", "3.ttf", "4.ttf", "5.ttf", "6.ttf", "7.ttf", "8.ttf"); //

    private static $Img = 'GIF89a'; //GIF header 6 bytes    

    private static $BUF = Array();

    private static $LOP = 0;

    private static $DIS = 2;

    private static $COL = -1;

    private static $IMG = -1;



    /**

      生成GIF图片验证

      @param int $L 验证码长度

      @param int $F 生成Gif图的帧数

      @param int $W 宽度

      @param int $H 高度

      @param int $MixCnt 干扰线数

      @param int $lineGap 网格线间隔

      @param int $noisyCnt 澡点数

      @param int $sessionName 验证码Session名称

     */

    public static function Draw($L = 4, $F = 1, $W = 150, $H = 30, $MixCnt = 2, $lineGap = 0, $noisyCnt = 10, $sessionName = "Code") {

        ob_start();

        ob_clean();



        for ($i = 0; $i < $L; $i++) {

            self::$Code .= SubStr(self::$Chars, mt_rand(0, strlen(self::$Chars) - 1), 1);

        }



        if (!isset($_SESSION))

            session_start();

        $_SESSION[$sessionName] = strtolower(self::$Code);



        $bgRGB = array(rand(0, 255), rand(0, 255), rand(0, 255));

        //生成一个多帧的GIF动画

        for ($i = 0; $i < $F; $i++) {

            $img = ImageCreate($W, $H);



            //背景色

            $bgColor = imagecolorallocate($img, $bgRGB[0], $bgRGB[1], $bgRGB[2]);

            ImageColorTransparent($img, $bgColor);

            unset($bgColor);



            //添加噪点

            $maxNoisy = rand(0, $noisyCnt);

            $noisyColor = imagecolorallocate($img, rand(0, 255), rand(0, 255), rand(0, 255));

            for ($k = 0; $k <= $maxNoisy; $k++) {

                imagesetpixel($img, rand(0, $W), rand(0, $H), $noisyColor);

            }



            //添加网格

            if ($lineGap > 0) {

                for ($m = 0; $m < ($W / $lineGap); $m++) { //竖线

                    imageline($img, $m * $lineGap, 0, $m * $lineGap, $H, $noisyColor);

                }

                for ($n = 0; $n < ($H / $lineGap); $n++) { //横线

                    imageline($img, 0, $n * $lineGap, $W, $n * $lineGap, $noisyColor);

                }

            }

            unset($noisyColor);



            // 添加干扰线

            for ($k = 0; $k < $MixCnt; $k++) {

                $wr = mt_rand(0, $W);

                $hr = mt_rand(0, $W);

                $lineColor = imagecolorallocate($img, rand(0, 255), rand(0, 255), rand(0, 255));

                imagearc($img, $W - floor($wr / 2), floor($hr / 2), $wr, $hr, rand(90, 180), rand(180, 270), $lineColor);

                unset($lineColor);

                unset($wr, $hr);

            }



            //第一帧忽略文字

            if ($i != 0 || $F <= 1) {

                //文字            

                $foreColor = imagecolorallocate($img, rand(0, 255), rand(0, 255), rand(0, 255));

                for ($j = 0; $j < $L; $j++) {

                    $fontFile = self::$FontFilePath . self::$FontFileName[rand(0, count(self::$FontFileName) - 1)];

                    if (!file_exists($fontFile))

                        imagestring($img, 4, self::$TextMargin + $j * self::$TextGap, ($H - rand($H / 2, $H)), self::$Code[$j], $foreColor);

                    else

                        imageTTFtext($img, rand(15, 18), rand(-15, 15), self::$TextMargin + $j * self::$TextGap, ($H - rand(7, 10)), $foreColor, $fontFile, self::$Code[$j]);

                }

                unset($foreColor);

            }



            ImageGif($img);

            Imagedestroy($img);

            $Imdata[] = ob_get_contents();

            OB_clean();

        }



        unset($W, $H, $B);

        if (self::$Debug) {

            echo $_SESSION['code'];

            echo '<pre>', Var_Dump($Imdata), '</pre>';

            die();

        }

        header('Content-type:image/gif');

        return self::CreateGif($Imdata, 20);

        unset($Imdata);

    }



    private static function CreateGif($GIF_src, $GIF_dly = 10, $GIF_lop = 0, $GIF_dis = 0, $GIF_red = 0, $GIF_grn = 0, $GIF_blu = 0, $GIF_mod = 'bin') {

        if (!is_array($GIF_src) && !is_array($GIF_tim)) {

            throw New Exception('Error:' . __LINE__ . ',Does not supported function for only one image!!');

            die();

        }

        self::$LOP = ($GIF_lop > -1) ? $GIF_lop : 0;

        self::$DIS = ($GIF_dis > -1) ? (($GIF_dis < 3) ? $GIF_dis : 3) : 2;

        self::$COL = ($GIF_red > -1 && $GIF_grn > -1 && $GIF_blu > -1) ? ($GIF_red | ($GIF_grn << 8) | ($GIF_blu << 16)) : -1;

        for ($i = 0, $src_count = count($GIF_src); $i < $src_count; $i++) {

            if (strToLower($GIF_mod) == 'url') {

                self::$BUF[] = fread(fopen($GIF_src[$i], 'rb'), filesize($GIF_src[$i]));

            } elseif (strToLower($GIF_mod) == 'bin') {

                self::$BUF[] = $GIF_src[$i];

            } else {

                throw New Exception('Error:' . __LINE__ . ',Unintelligible flag (' . $GIF_mod . ')!');

                die();

            }

            if (!(Substr(self::$BUF[$i], 0, 6) == 'GIF87a' Or Substr(self::$BUF[$i], 0, 6) == 'GIF89a')) {

                throw New Exception('Error:' . __LINE__ . ',Source ' . $i . ' is not a GIF image!');

                die();

            }

            for ($j = (13 + 3 * (2 << (ord(self::$BUF[$i]{10}) & 0x07))), $k = TRUE; $k; $j++) {

                switch (self::$BUF[$i]{$j}) {

                    case '!':

                        if ((substr(self::$BUF[$i], ($j + 3), 8)) == 'NETSCAPE') {

                            throw New Exception('Error:' . __LINE__ . ',Could not make animation from animated GIF source (' . ($i + 1) . ')!');

                            die();

                        }

                        break;

                    case ';':

                        $k = FALSE;

                        break;

                }

            }

        }

        self::AddHeader();

        for ($i = 0, $count_buf = count(self::$BUF); $i < $count_buf; $i++) {

            self::AddFrames($i, $GIF_dly);

        }

        self::$Img .= ';';

        return (self::$Img);

    }



    private static function AddHeader() {

        $i = 0;

        if (ord(self::$BUF[0]{10}) & 0x80) {

            $i = 3 * (2 << (ord(self::$BUF[0]{10}) & 0x07));

            self::$Img .= substr(self::$BUF[0], 6, 7);

            self::$Img .= substr(self::$BUF[0], 13, $i);

            self::$Img .= "!\377\13NETSCAPE2.0\3\1" . chr(self::$LOP & 0xFF) . chr((self::$LOP >> 8) & 0xFF) . "\0";

        }

        unset($i);

    }



    private static function AddFrames($i, $d) {

        $L_str = 13 + 3 * (2 << (ord(self::$BUF[$i]{10}) & 0x07));

        $L_end = strlen(self::$BUF[$i]) - $L_str - 1;

        $L_tmp = substr(self::$BUF[$i], $L_str, $L_end);

        $G_len = 2 << (ord(self::$BUF[0]{10}) & 0x07);

        $L_len = 2 << (ord(self::$BUF[$i]{10}) & 0x07);

        $G_rgb = substr(self::$BUF[0], 13, 3 * (2 << (ord(self::$BUF[0]{10}) & 0x07)));

        $L_rgb = substr(self::$BUF[$i], 13, 3 * (2 << (ord(self::$BUF[$i]{10}) & 0x07)));

        $L_ext = "!\xF9\x04" . chr((self::$DIS << 2) + 0) . chr(($d >> 0) & 0xFF) . chr(($d >> 8) & 0xFF) . "\x0\x0";

        if (self::$COL > -1 && ord(self::$BUF[$i]{10}) & 0x80) {

            for ($j = 0; $j < (2 << (ord(self::$BUF[$i]{10}) & 0x07)); $j++) {

                if (ord($L_rgb{3 * $j + 0}) == (self::$COL >> 0) & 0xFF && ord($L_rgb{3 * $j + 1}) == (self::$COL >> 8) & 0xFF && ord($L_rgb{3 * $j + 2}) == (self::$COL >> 16) & 0xFF) {

                    $L_ext = "!\xF9\x04" . chr((self::$DIS << 2) + 1) . chr(($d >> 0) & 0xFF) . chr(($d >> 8) & 0xFF) . chr($j) . "\x0";

                    break;

                }

            }

        }

        switch ($L_tmp{0}) {

            case '!':

                $L_img = substr($L_tmp, 8, 10);

                $L_tmp = substr($L_tmp, 18, strlen($L_tmp) - 18);

                break;

            case ',':

                $L_img = substr($L_tmp, 0, 10);

                $L_tmp = substr($L_tmp, 10, strlen($L_tmp) - 10);

                break;

        }

        if (ord(self::$BUF[$i]{10}) & 0x80 && self::$IMG > -1) {

            if ($G_len == $L_len) {

                if (self::Compare($G_rgb, $L_rgb, $G_len)) {

                    self::$Img .= ($L_ext . $L_img . $L_tmp);

                } else {

                    $byte = ord($L_img{9});

                    $byte |= 0x80;

                    $byte &= 0xF8;

                    $byte |= (ord(self::$BUF[0]{10}) & 0x07);

                    $L_img{9} = chr($byte);

                    self::$Img .= ($L_ext . $L_img . $L_rgb . $L_tmp);

                }

            } else {

                $byte = ord($L_img{9});

                $byte |= 0x80;

                $byte &= 0xF8;

                $byte |= (ord(self::$BUF[$i]{10}) & 0x07);

                $L_img{9} = chr($byte);

                self::$Img .= ($L_ext . $L_img . $L_rgb . $L_tmp);

            }

        } else {

            self::$Img .= ($L_ext . $L_img . $L_tmp);

        }

        self::$IMG = 1;

    }



    private static function Compare($G_Block, $L_Block, $Len) {

        for ($i = 0; $i < $Len; $i++) {

            if ($G_Block{3 * $i + 0} != $L_Block{3 * $i + 0} || $G_Block{3 * $i + 1} != $L_Block{3 * $i + 1} || $G_Block{3 * $i + 2} != $L_Block{3 * $i + 2}) {

                return (0);

            }

        }

        return (1);

    }



}