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如何从这个php类生成两个不同的函数?_Php_Gd - Fatal编程技术网

如何从这个php类生成两个不同的函数?

如何从这个php类生成两个不同的函数?,php,gd,Php,Gd,我有一个类,它有一个函数,使随机文本和验证码图像的基础上,随机文本都在一个函数。我想要的是把它们分开。我的意思是,我想有不同的函数来生成随机文本,我会将其保存在cookie中,然后验证码生成函数应该运行。我希望有这样的功能: $string = make_text(); //random text setcookie($string); // will write the cookie make_captcha($string); 以下是我们可以制作的课程: class KCAPTCHA{

我有一个类,它有一个函数,使随机文本和验证码图像的基础上,随机文本都在一个函数。我想要的是把它们分开。我的意思是,我想有不同的函数来生成随机文本,我会将其保存在cookie中,然后验证码生成函数应该运行。我希望有这样的功能:

$string = make_text(); //random text

setcookie($string); // will write the cookie

make_captcha($string);
以下是我们可以制作的课程:

class KCAPTCHA{

// generates keystring and image
function KCAPTCHA(){

    require(dirname(__FILE__).'/kcaptcha_config.php');
    $fonts=array();
    $fontsdir_absolute=dirname(__FILE__).'/'.$fontsdir;
    if ($handle = opendir($fontsdir_absolute)) {
        while (false !== ($file = readdir($handle))) {
            if (preg_match('/\.png$/i', $file)) {
                $fonts[]=$fontsdir_absolute.'/'.$file;
            }
        }
        closedir($handle);
    }   

    $alphabet_length=strlen($alphabet);

    do{
        // generating random keystring
        while(true){
            $this->keystring='';
            for($i=0;$i<$length;$i++){
                $this->keystring.=$allowed_symbols{mt_rand(0,strlen($allowed_symbols)-1)};
            }
            if(!preg_match('/cp|cb|ck|c6|c9|rn|rm|mm|co|do|cl|db|qp|qb|dp|ww/', $this->keystring)) break;
        }

        $font_file=$fonts[mt_rand(0, count($fonts)-1)];
        $font=imagecreatefrompng($font_file);
        imagealphablending($font, true);

        $fontfile_width=imagesx($font);
        $fontfile_height=imagesy($font)-1;

        $font_metrics=array();
        $symbol=0;
        $reading_symbol=false;

        // loading font
        for($i=0;$i<$fontfile_width && $symbol<$alphabet_length;$i++){
            $transparent = (imagecolorat($font, $i, 0) >> 24) == 127;

            if(!$reading_symbol && !$transparent){
                $font_metrics[$alphabet{$symbol}]=array('start'=>$i);
                $reading_symbol=true;
                continue;
            }

            if($reading_symbol && $transparent){
                $font_metrics[$alphabet{$symbol}]['end']=$i;
                $reading_symbol=false;
                $symbol++;
                continue;
            }
        }

        $img=imagecreatetruecolor($width, $height);
        imagealphablending($img, true);
        $white=imagecolorallocate($img, 255, 255, 255);
        $black=imagecolorallocate($img, 0, 0, 0);

        imagefilledrectangle($img, 0, 0, $width-1, $height-1, $white);

        // draw text
        $x=1;
        $odd=mt_rand(0,1);
        if($odd==0) $odd=-1;
        for($i=0;$i<$length;$i++){
            $m=$font_metrics[$this->keystring{$i}];

            $y=(($i%2)*$fluctuation_amplitude - $fluctuation_amplitude/2)*$odd
                + mt_rand(-round($fluctuation_amplitude/3), round($fluctuation_amplitude/3))
                + ($height-$fontfile_height)/2;

            if($no_spaces){
                $shift=0;
                if($i>0){
                    $shift=10000;
                    for($sy=3;$sy<$fontfile_height-10;$sy+=1){
                        for($sx=$m['start']-1;$sx<$m['end'];$sx+=1){
                            $rgb=imagecolorat($font, $sx, $sy);
                            $opacity=$rgb>>24;
                            if($opacity<127){
                                $left=$sx-$m['start']+$x;
                                $py=$sy+$y;
                                if($py>$height) break;
                                for($px=min($left,$width-1);$px>$left-200 && $px>=0;$px-=1){
                                    $color=imagecolorat($img, $px, $py) & 0xff;
                                    if($color+$opacity<170){ // 170 - threshold
                                        if($shift>$left-$px){
                                            $shift=$left-$px;
                                        }
                                        break;
                                    }
                                }
                                break;
                            }
                        }
                    }
                    if($shift==10000){
                        $shift=mt_rand(4,6);
                    }

                }
            }else{
                $shift=1;
            }
            imagecopy($img, $font, $x-$shift, $y, $m['start'], 1, $m['end']-$m['start'], $fontfile_height);
            $x+=$m['end']-$m['start']-$shift;
        }
    }while($x>=$width-10); // while not fit in canvas

    //noise
    $white=imagecolorallocate($font, 255, 255, 255);
    $black=imagecolorallocate($font, 0, 0, 0);
    for($i=0;$i<(($height-30)*$x)*$white_noise_density;$i++){
        imagesetpixel($img, mt_rand(0, $x-1), mt_rand(10, $height-15), $white);
    }
    for($i=0;$i<(($height-30)*$x)*$black_noise_density;$i++){
        imagesetpixel($img, mt_rand(0, $x-1), mt_rand(10, $height-15), $black);
    }


    $center=$x/2;

    // credits. To remove, see configuration file
    $img2=imagecreatetruecolor($width, $height+($show_credits?12:0));
    $foreground=imagecolorallocate($img2, $foreground_color[0], $foreground_color[1], $foreground_color[2]);
    $background=imagecolorallocate($img2, $background_color[0], $background_color[1], $background_color[2]);
    imagefilledrectangle($img2, 0, 0, $width-1, $height-1, $background);        
    imagefilledrectangle($img2, 0, $height, $width-1, $height+12, $foreground);
    $credits=empty($credits)?$_SERVER['HTTP_HOST']:$credits;
    imagestring($img2, 2, $width/2-imagefontwidth(2)*strlen($credits)/2, $height-2, $credits, $background);

    // periods
    $rand1=mt_rand(750000,1200000)/10000000;
    $rand2=mt_rand(750000,1200000)/10000000;
    $rand3=mt_rand(750000,1200000)/10000000;
    $rand4=mt_rand(750000,1200000)/10000000;
    // phases
    $rand5=mt_rand(0,31415926)/10000000;
    $rand6=mt_rand(0,31415926)/10000000;
    $rand7=mt_rand(0,31415926)/10000000;
    $rand8=mt_rand(0,31415926)/10000000;
    // amplitudes
    $rand9=mt_rand(330,420)/110;
    $rand10=mt_rand(330,450)/100;

    //wave distortion

    for($x=0;$x<$width;$x++){
        for($y=0;$y<$height;$y++){
            $sx=$x+(sin($x*$rand1+$rand5)+sin($y*$rand3+$rand6))*$rand9-$width/2+$center+1;
            $sy=$y+(sin($x*$rand2+$rand7)+sin($y*$rand4+$rand8))*$rand10;

            if($sx<0 || $sy<0 || $sx>=$width-1 || $sy>=$height-1){
                continue;
            }else{
                $color=imagecolorat($img, $sx, $sy) & 0xFF;
                $color_x=imagecolorat($img, $sx+1, $sy) & 0xFF;
                $color_y=imagecolorat($img, $sx, $sy+1) & 0xFF;
                $color_xy=imagecolorat($img, $sx+1, $sy+1) & 0xFF;
            }

            if($color==255 && $color_x==255 && $color_y==255 && $color_xy==255){
                continue;
            }else if($color==0 && $color_x==0 && $color_y==0 && $color_xy==0){
                $newred=$foreground_color[0];
                $newgreen=$foreground_color[1];
                $newblue=$foreground_color[2];
            }else{
                $frsx=$sx-floor($sx);
                $frsy=$sy-floor($sy);
                $frsx1=1-$frsx;
                $frsy1=1-$frsy;

                $newcolor=(
                    $color*$frsx1*$frsy1+
                    $color_x*$frsx*$frsy1+
                    $color_y*$frsx1*$frsy+
                    $color_xy*$frsx*$frsy);

                if($newcolor>255) $newcolor=255;
                $newcolor=$newcolor/255;
                $newcolor0=1-$newcolor;

                $newred=$newcolor0*$foreground_color[0]+$newcolor*$background_color[0];
                $newgreen=$newcolor0*$foreground_color[1]+$newcolor*$background_color[1];
                $newblue=$newcolor0*$foreground_color[2]+$newcolor*$background_color[2];
            }

            imagesetpixel($img2, $x, $y, imagecolorallocate($img2, $newred, $newgreen, $newblue));
        }
    }

    header('Expires: Mon, 26 Jul 1997 05:00:00 GMT'); 
    header('Cache-Control: no-store, no-cache, must-revalidate'); 
    header('Cache-Control: post-check=0, pre-check=0', FALSE); 
    header('Pragma: no-cache');
    if(function_exists("imagejpeg")){
        header("Content-Type: image/jpeg");
        imagejpeg($img2, null, $jpeg_quality);
    }else if(function_exists("imagegif")){
        header("Content-Type: image/gif");
        imagegif($img2);
    }else if(function_exists("imagepng")){
        header("Content-Type: image/x-png");
        imagepng($img2);
    }
}
KCAPTCHA类{
//生成键串和图像
函数KCAPTCHA(){
require(dirname(_文件)'/kcaptcha_config.php');
$fonts=array();
$fontsdir_absolute=dirname(_文件)“/”。$fontsdir;
如果($handle=opendir($fontsdir\u绝对值)){
while(false!=($file=readdir($handle))){
if(preg_匹配('/\.png$/i',$file)){
$fonts[]=$fontsdir_绝对'/'.$文件;
}
}
closedir($handle);
}   
$alphabet_length=strlen($alphabet);
做{
//生成随机键串
while(true){
$this->keystring='';
对于($i=0;$ikeystring.=$allowed_符号{mt_rand(0,strlen($allowed_符号)-1)};
}
如果(!preg|u match('/cp | cb | ck | c6 | c9 | rn | rm | mm | co | do | cl | db | qp | qb | dp | ww/,$this->键串)中断;
}
$font_file=$fonts[mt_rand(0,计数($fonts)-1)];
$font=imagecreatefrompng($font\U文件);
imagealphablending($font,true);
$fontfile_width=imagesx($font);
$fontfile_height=imagesy($font)-1;
$font_metrics=array();
$symbol=0;
$reading_symbol=错误;
//加载字体
对于($i=0;$i24)==127;
if(!$reading_symbol&&!$透明){
$font_metrics[$alphabet{$symbol}]=array('start'=>$i);
$reading_symbol=真;
持续
}
if($reading_symbol&&$透明){
$font_metrics[$alphabet{$symbol}]['end']=$i;
$reading_symbol=错误;
$symbol++;
持续
}
}
$img=ImageCreateTureColor($width,$height);
imagealphablending($img,true);
$white=imagecolorallocate($img,255,255,255);
$black=imagecolorallocate($img,0,0,0);
imagefilledrectangle($img,0,0,$width-1,$height-1,$white);
//绘制文本
$x=1;
$odd=百万兰特(0,1);
如果($odd==0)$odd=-1;
对于($i=0;$ikeystring{$i}];
$y=($i%2)*$波动幅度-$波动幅度/2)*$奇数
+mt_rand(-round($波动幅度/3),round($波动幅度/3))
+($height-$fontfile_height)/2;
如果($no_空格){
$shift=0;
如果($i>0){
$shift=10000;
对于($sy=3;$sy24;
如果($opacity$height)中断;
对于($px=min($left,$width-1);$px>$left-200&&$px>=0;$px-=1){
$color=imagecolorat($img,$px,$py)&0xff;
如果($color+$opacity$left-$px){
$shift=$left-$px;
}
打破
}
}
打破
}
}
}
如果($shift==10000){
$shift=百万兰特(4,6);
}
}
}否则{
$shift=1;
}
图像复制($img、$font、$x-$shift、$y、$m['start']、1、$m['end']-$m['start']、$fontfile\U height);
$x+=$m['end']-$m['start']-$shift;
}
}while($x>=$width-10);//虽然不适合画布
//噪音
$white=imagecolorallocate($font,255,255);
$black=imagecolorallocate($font,0,0,0);

对于($i=0;$i首先,在cookie中存储captcha是个坏主意,因为机器人可以轻松地从cookie中读取正确的captcha。最好使用会话或一些存储

其次,在kcaptcha_config.php文件中有一些已初始化的变量,您需要将所需的变量初始化移到函数中

获取文本功能:

function make_text()
{
    // generating random keystring
    while(true){
        $keystring='';
        for($i=0;$i<$length;$i++){
            $keystring.=$allowed_symbols{mt_rand(0,strlen($allowed_symbols)-1)};
        }
        if(!preg_match('/cp|cb|ck|c6|c9|rn|rm|mm|co|do|cl|db|qp|qb|dp|ww/', $keystring)) break;
    }

    return $keystring;
}
函数make_text()
{
//生成随机键串
while(true){
$keystring='';

对于($i=0;$i不会将解决方案发送到客户端。这违背了验证码的全部目的。我想说您可以对其进行加密-但是在反射时,这并不能解决任何问题(重播攻击,mitm),因此我将投票给bongi。您也可以使用ReCAPTCHA而不是构建自己的验证码实现:)是的,我知道。但是我会用盐加密,这很难做到。我会检查函数并回复你。奇怪的是,两个函数都不起作用。它们只是在作为一个函数工作时起作用。我说过,如果有变量在kcaptcha_config.php中被初始化,你需要将这些初始化从这个文件复制到你的功能
function make_captcha($keystring){

  $fonts=array();
  $fontsdir_absolute=dirname(__FILE__).'/'.$fontsdir;
  if ($handle = opendir($fontsdir_absolute)) {
      while (false !== ($file = readdir($handle))) {
          if (preg_match('/\.png$/i', $file)) {
              $fonts[]=$fontsdir_absolute.'/'.$file;
          }
      }
      closedir($handle);
  }

  $alphabet_length=strlen($alphabet);

  do{

      $font_file=$fonts[mt_rand(0, count($fonts)-1)];
      $font=imagecreatefrompng($font_file);
      imagealphablending($font, true);

      $fontfile_width=imagesx($font);
      $fontfile_height=imagesy($font)-1;

      $font_metrics=array();
      $symbol=0;
      $reading_symbol=false;

      // loading font
      for($i=0;$i<$fontfile_width && $symbol<$alphabet_length;$i++){
          $transparent = (imagecolorat($font, $i, 0) >> 24) == 127;

          if(!$reading_symbol && !$transparent){
              $font_metrics[$alphabet{$symbol}]=array('start'=>$i);
              $reading_symbol=true;
              continue;
          }

          if($reading_symbol && $transparent){
              $font_metrics[$alphabet{$symbol}]['end']=$i;
              $reading_symbol=false;
              $symbol++;
              continue;
          }
      }

      $img=imagecreatetruecolor($width, $height);
      imagealphablending($img, true);
      $white=imagecolorallocate($img, 255, 255, 255);
      $black=imagecolorallocate($img, 0, 0, 0);

      imagefilledrectangle($img, 0, 0, $width-1, $height-1, $white);

      // draw text
      $x=1;
      $odd=mt_rand(0,1);
      if($odd==0) $odd=-1;
      for($i=0;$i<$length;$i++){
          $m=$font_metrics[$keystring{$i}];

          $y=(($i%2)*$fluctuation_amplitude - $fluctuation_amplitude/2)*$odd
              + mt_rand(-round($fluctuation_amplitude/3), round($fluctuation_amplitude/3))
              + ($height-$fontfile_height)/2;

          if($no_spaces){
              $shift=0;
              if($i>0){
                  $shift=10000;
                  for($sy=3;$sy<$fontfile_height-10;$sy+=1){
                      for($sx=$m['start']-1;$sx<$m['end'];$sx+=1){
                          $rgb=imagecolorat($font, $sx, $sy);
                          $opacity=$rgb>>24;
                          if($opacity<127){
                              $left=$sx-$m['start']+$x;
                              $py=$sy+$y;
                              if($py>$height) break;
                              for($px=min($left,$width-1);$px>$left-200 && $px>=0;$px-=1){
                                  $color=imagecolorat($img, $px, $py) & 0xff;
                                  if($color+$opacity<170){ // 170 - threshold
                                      if($shift>$left-$px){
                                          $shift=$left-$px;
                                      }
                                      break;
                                  }
                              }
                              break;
                          }
                      }
                  }
                  if($shift==10000){
                      $shift=mt_rand(4,6);
                  }

              }
          }else{
              $shift=1;
          }
          imagecopy($img, $font, $x-$shift, $y, $m['start'], 1, $m['end']-$m['start'], $fontfile_height);
          $x+=$m['end']-$m['start']-$shift;
      }
  }while($x>=$width-10); // while not fit in canvas

  //noise
  $white=imagecolorallocate($font, 255, 255, 255);
  $black=imagecolorallocate($font, 0, 0, 0);
  for($i=0;$i<(($height-30)*$x)*$white_noise_density;$i++){
      imagesetpixel($img, mt_rand(0, $x-1), mt_rand(10, $height-15), $white);
  }
  for($i=0;$i<(($height-30)*$x)*$black_noise_density;$i++){
      imagesetpixel($img, mt_rand(0, $x-1), mt_rand(10, $height-15), $black);
  }


  $center=$x/2;

  // credits. To remove, see configuration file
  $img2=imagecreatetruecolor($width, $height+($show_credits?12:0));
  $foreground=imagecolorallocate($img2, $foreground_color[0], $foreground_color[1], $foreground_color[2]);
  $background=imagecolorallocate($img2, $background_color[0], $background_color[1], $background_color[2]);
  imagefilledrectangle($img2, 0, 0, $width-1, $height-1, $background);
  imagefilledrectangle($img2, 0, $height, $width-1, $height+12, $foreground);
  $credits=empty($credits)?$_SERVER['HTTP_HOST']:$credits;
  imagestring($img2, 2, $width/2-imagefontwidth(2)*strlen($credits)/2, $height-2, $credits, $background);

  // periods
  $rand1=mt_rand(750000,1200000)/10000000;
  $rand2=mt_rand(750000,1200000)/10000000;
  $rand3=mt_rand(750000,1200000)/10000000;
  $rand4=mt_rand(750000,1200000)/10000000;
  // phases
  $rand5=mt_rand(0,31415926)/10000000;
  $rand6=mt_rand(0,31415926)/10000000;
  $rand7=mt_rand(0,31415926)/10000000;
  $rand8=mt_rand(0,31415926)/10000000;
  // amplitudes
  $rand9=mt_rand(330,420)/110;
  $rand10=mt_rand(330,450)/100;

  //wave distortion

  for($x=0;$x<$width;$x++){
      for($y=0;$y<$height;$y++){
          $sx=$x+(sin($x*$rand1+$rand5)+sin($y*$rand3+$rand6))*$rand9-$width/2+$center+1;
          $sy=$y+(sin($x*$rand2+$rand7)+sin($y*$rand4+$rand8))*$rand10;

          if($sx<0 || $sy<0 || $sx>=$width-1 || $sy>=$height-1){
              continue;
          }else{
              $color=imagecolorat($img, $sx, $sy) & 0xFF;
              $color_x=imagecolorat($img, $sx+1, $sy) & 0xFF;
              $color_y=imagecolorat($img, $sx, $sy+1) & 0xFF;
              $color_xy=imagecolorat($img, $sx+1, $sy+1) & 0xFF;
          }

          if($color==255 && $color_x==255 && $color_y==255 && $color_xy==255){
              continue;
          }else if($color==0 && $color_x==0 && $color_y==0 && $color_xy==0){
              $newred=$foreground_color[0];
              $newgreen=$foreground_color[1];
              $newblue=$foreground_color[2];
          }else{
              $frsx=$sx-floor($sx);
              $frsy=$sy-floor($sy);
              $frsx1=1-$frsx;
              $frsy1=1-$frsy;

              $newcolor=(
                  $color*$frsx1*$frsy1+
                  $color_x*$frsx*$frsy1+
                  $color_y*$frsx1*$frsy+
                  $color_xy*$frsx*$frsy);

              if($newcolor>255) $newcolor=255;
              $newcolor=$newcolor/255;
              $newcolor0=1-$newcolor;

              $newred=$newcolor0*$foreground_color[0]+$newcolor*$background_color[0];
              $newgreen=$newcolor0*$foreground_color[1]+$newcolor*$background_color[1];
              $newblue=$newcolor0*$foreground_color[2]+$newcolor*$background_color[2];
          }

          imagesetpixel($img2, $x, $y, imagecolorallocate($img2, $newred, $newgreen, $newblue));
      }
  }

  header('Expires: Mon, 26 Jul 1997 05:00:00 GMT');
  header('Cache-Control: no-store, no-cache, must-revalidate');
  header('Cache-Control: post-check=0, pre-check=0', FALSE);
  header('Pragma: no-cache');
  if(function_exists("imagejpeg")){
      header("Content-Type: image/jpeg");
      imagejpeg($img2, null, $jpeg_quality);
  }else if(function_exists("imagegif")){
      header("Content-Type: image/gif");
      imagegif($img2);
  }else if(function_exists("imagepng")){
      header("Content-Type: image/x-png");
      imagepng($img2);
  }
}