PHP生成Gif图片验证码

jopen 6年前
验证码在好多地方都要用到,这里提供一个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)。从中还可以学到如何用PHP生成Gif图片的方法。

先看效果图

 

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

复制代码代码如下:

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:
 
<?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)      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();    } // www.jbxue.com   */  $mod = strtolower(isset($_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);      }    }


用法在类开头的注释里。