225 lines
7.7 KiB
PHP
Executable File
225 lines
7.7 KiB
PHP
Executable File
<?php
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class myCaptcha{
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var $keystring;
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function __construct($length){
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$alphabet = "0123456789abcdefghijklmnopqrstuvwxyz"; # do not change without changing font files!
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$width = 140;
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$height = 60;
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$fluctuation_amplitude = $height/10;//上下起伏
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$white_noise_density=1/10;//$white_noise_density=0; // no white noise
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$black_noise_density=1/100;//$black_noise_density=0; // no black noise
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$foreground_color = array(mt_rand(0,120), mt_rand(0,120), mt_rand(0,120));
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$background_color = array(mt_rand(220,255), mt_rand(220,255), mt_rand(220,255));
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$font_path = dirname(__FILE__).'/myCaptcha_fonts/';
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$fonts=array($font_path.'font_1.png',$font_path.'font_2.png',$font_path.'font_3.png');
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$alphabet_length=strlen($alphabet);
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do{
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$this->keystring = $this->rand_string($length);
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$font_file=$fonts[mt_rand(0, count($fonts)-1)];
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$font=imagecreatefrompng($font_file);
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imagealphablending($font, true);
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$fontfile_width=imagesx($font);
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$fontfile_height=imagesy($font)-1;
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$font_metrics=array();
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$symbol=0;
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$reading_symbol=false;
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// loading font
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for($i=0;$i<$fontfile_width && $symbol<$alphabet_length;$i++){
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$transparent = (imagecolorat($font, $i, 0) >> 24) == 127;
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if(!$reading_symbol && !$transparent){
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$font_metrics[$alphabet{$symbol}]=array('start'=>$i);
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$reading_symbol=true;
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continue;
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}
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if($reading_symbol && $transparent){
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$font_metrics[$alphabet{$symbol}]['end']=$i;
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$reading_symbol=false;
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$symbol++;
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continue;
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}
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}
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$img=imagecreatetruecolor($width, $height);
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imagealphablending($img, true);
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$white=imagecolorallocate($img, 255, 255, 255);
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$black=imagecolorallocate($img, 0, 0, 0);
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imagefilledrectangle($img, 0, 0, $width-1, $height-1, $white);
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$x=1;
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$odd=mt_rand(0,1);
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if($odd==0) $odd=-1;
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for($i=0;$i<$length;$i++){
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$m=$font_metrics[$this->keystring{$i}];
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$y=(($i%2)*$fluctuation_amplitude - $fluctuation_amplitude/2)*$odd
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+ mt_rand(-round($fluctuation_amplitude/3), round($fluctuation_amplitude/3))
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+ ($height-$fontfile_height)/2;
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$shift=1;
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imagecopy($img, $font, $x-$shift, $y, $m['start'], 1, $m['end']-$m['start'], $fontfile_height);
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$x+=$m['end']-$m['start']-$shift;
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}
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}while($x>=$width-10); // while not fit in canvas
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//noise
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$white=imagecolorallocate($font, 255, 255, 255);
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$black=imagecolorallocate($font, 0, 0, 0);
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for($i=0;$i<(($height-30)*$x)*$white_noise_density;$i++){
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imagesetpixel($img, mt_rand(0, $x-1), mt_rand(10, $height-15), $white);
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}
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for($i=0;$i<(($height-30)*$x)*$black_noise_density;$i++){
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imagesetpixel($img, mt_rand(0, $x-1), mt_rand(10, $height-15), $black);
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}
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$center=$x/2;
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// credits. To remove, see configuration file
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$img2=imagecreatetruecolor($width, $height);
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$foreground=imagecolorallocate($img2, $foreground_color[0], $foreground_color[1], $foreground_color[2]);
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$background=imagecolorallocate($img2, $background_color[0], $background_color[1], $background_color[2]);
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imagefilledrectangle($img2, 0, 0, $width-1, $height-1, $background);
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imagefilledrectangle($img2, 0, $height, $width-1, $height+12, $foreground);
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$this->draw_line($img2,$width,$height);
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// periods
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$rand1=mt_rand(750000,1200000)/10000000;
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$rand2=mt_rand(750000,1200000)/10000000;
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$rand3=mt_rand(750000,1200000)/10000000;
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$rand4=mt_rand(750000,1200000)/10000000;
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// phases
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$rand5=mt_rand(0,31415926)/10000000;
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$rand6=mt_rand(0,31415926)/10000000;
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$rand7=mt_rand(0,31415926)/10000000;
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$rand8=mt_rand(0,31415926)/10000000;
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// amplitudes
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$rand9=mt_rand(330,420)/110;
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$rand10=mt_rand(330,450)/100;
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//wave distortion
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for($x=0;$x<$width;$x++){
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for($y=0;$y<$height;$y++){
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$sx=$x+(sin($x*$rand1+$rand5)+sin($y*$rand3+$rand6))*$rand9-$width/2+$center+1;
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$sy=$y+(sin($x*$rand2+$rand7)+sin($y*$rand4+$rand8))*$rand10;
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if($sx<0 || $sy<0 || $sx>=$width-1 || $sy>=$height-1){
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continue;
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}else{
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$color=imagecolorat($img, $sx, $sy) & 0xFF;
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$color_x=imagecolorat($img, $sx+1, $sy) & 0xFF;
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$color_y=imagecolorat($img, $sx, $sy+1) & 0xFF;
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$color_xy=imagecolorat($img, $sx+1, $sy+1) & 0xFF;
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}
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if($color==255 && $color_x==255 && $color_y==255 && $color_xy==255){
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continue;
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}else if($color==0 && $color_x==0 && $color_y==0 && $color_xy==0){
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$newred=$foreground_color[0];
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$newgreen=$foreground_color[1];
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$newblue=$foreground_color[2];
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}else{
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$frsx=$sx-floor($sx);
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$frsy=$sy-floor($sy);
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$frsx1=1-$frsx;
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$frsy1=1-$frsy;
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$newcolor=(
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$color*$frsx1*$frsy1+
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$color_x*$frsx*$frsy1+
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$color_y*$frsx1*$frsy+
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$color_xy*$frsx*$frsy
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);
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if($newcolor>255) $newcolor=255;
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$newcolor=$newcolor/255;
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$newcolor0=1-$newcolor;
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$newred=$newcolor0*$foreground_color[0]+$newcolor*$background_color[0];
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$newgreen=$newcolor0*$foreground_color[1]+$newcolor*$background_color[1];
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$newblue=$newcolor0*$foreground_color[2]+$newcolor*$background_color[2];
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}
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imagesetpixel($img2, $x, $y, imagecolorallocate($img2, $newred, $newgreen, $newblue));
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}
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}
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$this->show_img($img2);
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}
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public function get_string(){
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return $this->keystring;
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}
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private function rand_string($length){
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$str = '';
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$allowed_symbols = "23456789abcdegikpqsvxyz"; //without symbols (o=0, 1=l, i=j, t=f)
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while(true){
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$str = '';
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for($i=0;$i<$length;$i++){
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$str .= $allowed_symbols{mt_rand(0,strlen($allowed_symbols)-1)};
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}
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if(!preg_match('/cp|cb|ck|c6|c9|rn|rm|mm|co|do|cl|db|qp|qb|dp|ww/',$str)) break;
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}
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return $str;
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}
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private function frand(){
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return mt_rand(0,9999)/10000;
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}
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private function draw_line(&$img,$width,$height){
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$line_number = 5;
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$color_from = 100;
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for ($line = 0; $line < $line_number; ++ $line) {
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$line_color = imagecolorallocate($img, mt_rand($color_from,255),
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mt_rand($color_from, 255),mt_rand($color_from, 255));
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$x = $width * (1 + $line) / ($line_number + 1);
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$x += (0.5 - $this->frand()) * $width / $line_number;
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$y = mt_rand($height * 0.1, $height * 0.9);
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$theta = ($this->frand() - 0.5) * M_PI * 0.7;
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$w = $width;
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$len = mt_rand($w * 0.4, $w * 0.7);
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$lwid = mt_rand(0, 2);
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$k = $this->frand() * 0.6 + 0.2;
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$k = $k * $k * 0.5;
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$phi = $this->frand() * 6.28;
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$step = 0.5;
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$dx = $step * cos($theta);
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$dy = $step * sin($theta);
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$n = $len / $step;
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$amp = 1.5 * $this->frand() / ($k + 5.0 / $len);
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$x0 = $x - 0.5 * $len * cos($theta);
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$y0 = $y - 0.5 * $len * sin($theta);
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$ldx = round(- $dy * $lwid);
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$ldy = round($dx * $lwid);
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for ($i = 0; $i < $n; ++ $i) {
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$x = $x0 + $i * $dx + $amp * $dy * sin($k * $i * $step + $phi);
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$y = $y0 + $i * $dy - $amp * $dx * sin($k * $i * $step + $phi);
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imagefilledrectangle($img, $x, $y, $x + $lwid, $y + $lwid,$line_color);
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}
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}
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$allowed_symbols = "0123456789abcdefghijklmnopqrstuvwxyz";
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for ($i = 0; $i < 20; $i++) {//写入随机字串
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$char = $allowed_symbols[mt_rand(0,strlen($allowed_symbols)-1)];
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$line_color = imagecolorallocate($img,
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mt_rand($color_from,255),mt_rand($color_from, 255),mt_rand($color_from, 255));
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imagechar($img,mt_rand(0,4),mt_rand(0,$width),rand(0,$height),$char,$line_color);
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}
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}
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private function show_img(&$img){
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ob_get_clean();
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$out = ob_get_clean();//清除之前所有输出缓冲 TODO
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header('Expires: Mon, 26 Jul 1997 05:00:00 GMT');
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header('Cache-Control: no-store, no-cache, must-revalidate');
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header('Cache-Control: post-check=0, pre-check=0', FALSE);
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header('Pragma: no-cache');
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if(function_exists("imagejpeg")){
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header("Content-Type: image/jpeg");
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imagejpeg($img, null,90);//图片质量
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}else if(function_exists("imagegif")){
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header("Content-Type: image/gif");
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imagegif($img);
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}else if(function_exists("imagepng")){
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header("Content-Type: image/x-png");
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imagepng($img);
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}
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}
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}
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