Яндекс-like капча

Яндекс-like капча


<?
/*
Измененная версия каптчи с captcha.ru
Генерирует 6 значное число и сохряняет его
в $_SESSION['code']
*/

session_start();
$font=imagecreatefrompng("font.png");
imagealphablending($font, true);
$fontfile_width=imagesx($font);
$fontfile_height=imagesy($font)-1;
$font_metrics=array();
$symbol=0;
$reading_symbol=false;

$alphabet = "0123456789";
$alphabet_length = strlen($alphabet);

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;
}
}

$image = imagecreatetruecolor(225,70);
$width = ImageSX($image);
$height = ImageSY($image);

imagealphablending($image, true);

$background_color = array(255,255,255);
$foreground_color = array(0, 0, 0);

$white=imagecolorallocate($image, 255, 255, 255);
$black=imagecolorallocate($image, 128, 128, 0);

imagefilledrectangle($image, 0, 0, ImageSX($image)-1, ImageSY($image)-1, $white);

$string = '';
$x = 5;
$y = 5;

for ($i=0;$i<6;$i++) {
$char = rand(0,9);
$string .= $char;
if ($x > 15) $x = $x - 2;
imagecopy($image,$font,$x,$y,$font_metrics[$char]['start'],1,$font_metrics[$char]['end']-$font_metrics[$char]['start'],59);
$x += $font_metrics[$char]['end']-$font_metrics[$char]['start'];
}

for ($i=0;$i<10;$i++) {
ImageSmoothAlphaLine($image,Rand(5,$width*0.5),Rand(5,$height-5),rand($width*0.5,$width-5),rand(5,$height-5),255,255,255);
}

for ($i=0;$i<2;$i++) {
ImageSmoothAlphaLine($image,rand(5,10),Rand(5,$height-5),rand($width-10,$width-5),rand(5,$height-5),0,0,0);
}

$center=$x/2;

$img2=imagecreatetruecolor(ImageSX($image), ImageSY($image));

$rand1=mt_rand(750000,1200000)/10000000;
$rand2=mt_rand(750000,1200000)/10000000;
$rand3=mt_rand(750000,1200000)/10000000;
$rand4=mt_rand(750000,1200000)/10000000;

$rand5=mt_rand(0,3141592)/500000;
$rand6=mt_rand(0,3141592)/500000;
$rand7=mt_rand(0,3141592)/500000;
$rand8=mt_rand(0,3141592)/500000;

$rand9=mt_rand(330,420)/110;
$rand10=mt_rand(330,450)/110;

for($x=0;$x<ImageSX($image);$x++){
for($y=0;$y<ImageSY($image);$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){
$color=255;
$color_x=255;
$color_y=255;
$color_xy=255;
}else{
$color=imagecolorat($image, $sx, $sy) & 0xFF;
$color_x=imagecolorat($image, $sx+1, $sy) &  0xFF;
$color_y=imagecolorat($image, $sx, $sy+1) & 0xFF;
$color_xy=imagecolorat($image, $sx+1, $sy+1) & 0xFF;
}
if($color==0 && $color_x==0 && $color_y==0 && $color_xy==0){
$newred=$foreground_color[0];
$newgreen=$foreground_color[1];
$newblue=$foreground_color[2];
}else if($color==255 && $color_x==255 && $color_y==255 && $color_xy==255){
$newred=$background_color[0];
$newgreen=$background_color[1];
$newblue=$background_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));
}
}
$_SESSION['code'] = $string;
header("content-type: image/png");
ImagePng($img2);

function ImageSmoothAlphaLine ($image, $x1, $y1, $x2, $y2, $r, $g, $b, $alpha=0) {
$icr = $r;
$icg = $g;
$icb = $b;
$dcol = imagecolorallocatealpha($image, $icr, $icg, $icb, $alpha);

if ($y1 == $y2 || $x1 == $x2)
imageline($image, $x1, $y2, $x1, $y2, $dcol);
else {
$m = ($y2 - $y1) / ($x2 - $x1);
$b = $y1 - $m * $x1;

if (abs ($m) <2) {
$x = min($x1, $x2);
$endx = max($x1, $x2) + 1;

while ($x < $endx) {
$y = $m * $x + $b;
$ya = ($y == floor($y) ? 1: $y - floor($y));
$yb = ceil($y) - $y;

$trgb = ImageColorAt($image, $x, floor($y));
$tcr = ($trgb >> 16) & 0xFF;
$tcg = ($trgb >> 8) & 0xFF;
$tcb = $trgb & 0xFF;
imagesetpixel($image, $x, floor($y), imagecolorallocatealpha($image, ($tcr * $ya + $icr * $yb), ($tcg * $ya + $icg * $yb), ($tcb * $ya + $icb * $yb), $alpha));

$trgb = ImageColorAt($image, $x, ceil($y));
$tcr = ($trgb >> 16) & 0xFF;
$tcg = ($trgb >> 8) & 0xFF;
$tcb = $trgb & 0xFF;
imagesetpixel($image, $x, ceil($y), imagecolorallocatealpha($image, ($tcr * $yb + $icr * $ya), ($tcg * $yb + $icg * $ya), ($tcb * $yb + $icb * $ya), $alpha));

$x++;
}
} else {
$y = min($y1, $000BB">$y2);
$endy = max($y1, $y2) + 1;

while ($y < $endy) {
$x = ($y - $b) / $m;
$xa = ($x == floor($x) ? 1: $x - floor($x));
$xb ceil($x) - $x;

$trgb = ImageColorAt($image, floor($x), $y);
$tcr = ($trgb >> 16) & 0xFF;
$tcg = ($trgb >> 8) & 0xFF;
$tcb = $trgb & 0xFF;
imagesetpixel($image, floor($x), $y, imagecolorallocatealpha($image, ($tcr * $xa + $icr * $xb), ($tcg * $xa + $icg * $xb), ($tcb * $xa + $icb * $xb), $alpha));

$trgb = ImageColorAt($image, ceil($x), $y);
$tcr = ($trgb >> 16)& 0xFF;
$tcg = ($trgb >> 8) &  0xFF;
$tcb = $trgb &  0xFF;
imagesetpixel ($image, ceil($x), $y, imagecolorallocatealpha($image, ($tcr * $xb + $icr * $xa), ($tcg * $xb + $icg * $xa), ($tcb * $xb + $icb * $xa), $alpha));

$y ++;
}
}
}
} // end of 'imageSmoothAlphaLine()' function
?>

Jeck labs

Несколько слов об авторе Jeck labs

Полезный сайт для web разработчиков и специалистов работающих в сфере SEO индустрии. Ресурс полон полезной информации и статей. Кстати, Jeck является создателем одного из наиболее популярных ресурсов www.pr-cy.ru
http://jeck.ru/

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