{

// generate pronouncable pass

$pass = genPassword(5, 6);

$font = './captcha.ttf';

$maxsize = 50;

$sizeVar = 25;

$rotate = 20;

$bgcol = 50; // + 50

$bgtextcol = 80; // + 50

$textcol = 205; // + 50

// remember the pass

$_SESSION["captcha"] = $pass;

// calculate dimentions required for pass

$box = @imageTTFBbox($maxsize,0,$font,$pass);

$minwidth = abs($box[4] - $box[0]);

$minheight = abs($box[5] - $box[1]);

// allow spacing for rotating letters

$width = $minwidth + 100;

$height = $minheight + rand(5,15); // give some air for the letters to breathe

// create initial image

$image = ImageCreatetruecolor($width, $height);

if (function_exists('imageantialias')) {

imageantialias($image, true);

}

// define background color - never the same, close to black

$clr_black = ImageColorAllocate($image, rand($bgcol, $bgcol+30),

rand($bgcol, $bgcol+30), rand($bgcol, $bgcol+30));

imagefill($image, 0, 0, $clr_black);

// calculate starting positions for letters

$x = rand(10, 25);//($width / 2) - ($minwidth / 2);

$xinit = $x;

$y = ($minheight-abs($box[1])) + (($height - $minheight) / 2);

// fill the background with big letters, colored a bit lightly, to vary the bg.

$bgx = $x / 2;

$size = rand($maxsize - 10, $maxsize);

for($i = 0; $i < strlen($pass); $i++) {

// modify color a bit

$clr_white = ImageColorAllocate($image, rand($bgtextcol, $bgtextcol+50),

rand($bgtextcol, $bgtextcol+50), rand($bgtextcol, $bgtextcol+50));

$angle = rand(0-$rotate, $rotate);

$letter = substr($pass, $i, 1);

imagettftext($image, $size*2, $angle, $bgx, $y, $clr_white, $font, $letter);

list($x1, $a, $a, $a, $x2) = @imageTTFBbox($size,$angle,$font,$letter);

$bgx += abs($x2 - $x1);

}

// for each letter, decide a color, decide a rotation, put it on the image,

// and figure out width to place next letter correctly

for($i = 0; $i < strlen($pass); $i++) {

// modify color a bit

$clr_white = ImageColorAllocate($image, rand($textcol, $textcol+50),

rand($textcol, $textcol+50), rand($textcol, $textcol+50));

$angle = rand(0-$rotate, $rotate);

$letter = substr($pass, $i, 1);

$size = rand($maxsize - $sizeVar, $maxsize);

$tempbox = @imageTTFBbox($size,$angle,$font,$letter);

$y = (abs($tempbox[5] - $tempbox[1])) +

(($height - abs($tempbox[5] - $tempbox[1])) / 2);

imagettftext($image, $size, $angle, $x, $y, $clr_white, $font, $letter);

$x += abs($tempbox[4]-$tempbox[0]);

}

// figure out final width (same space at the end as there was at the beginning)

$width = $xinit + $x;

// throw in some lines

$clr_white = ImageColorAllocate($image, rand(160, 200), rand(160, 200),

rand(160, 200));

imagelinethick($image, rand(0, 10), rand(0, $height / 2), rand($width - 10, $width),

rand($height / 2, $height), $clr_white, rand(1, 2));

$clr_white = ImageColorAllocate($image, rand(160, 200), rand(160, 200),

rand(160, 200));

imagelinethick($image, rand(($width / 2) - 10, $width / 2),

rand($height / 2, $height), rand(($width / 2)+ 10, $width),

rand(0, ($height / 2)), $clr_white, rand(1, 2));

// generate final image by cropping initial image to the proper width,

// which we didn't know till now.

$finalimage = ImageCreatetruecolor($width, $height);

if (function_exists('imageantialias')) {

imageantialias($finalimage, true);

}

imagecopy($finalimage, $image, 0, 0, 0, 0, $width, $height);

// clear some memory

imagedestroy($image);

// dump image

imagepng($finalimage);

// clear some more memory

imagedestroy($finalimage);

if ($thick == 1) {

return imageline($image, $x1, $y1, $x2, $y2, $color);

}

$t = $thick / 2 - 0.5;

if ($x1 == $x2 || $y1 == $y2) {

return imagefilledrectangle($image, round(min($x1, $x2) - $t),

round(min($y1, $y2) - $t),

round(max($x1, $x2) + $t),

round(max($y1, $y2) + $t),

$color);

}

$k = ($y2 - $y1) / ($x2 - $x1); //y = kx + q

$a = $t / sqrt(1 + pow($k, 2));

$points = array(

round($x1 - (1+$k)*$a), round($y1 + (1-$k)*$a),

round($x1 - (1-$k)*$a), round($y1 - (1+$k)*$a),

round($x2 + (1+$k)*$a), round($y2 - (1-$k)*$a),

round($x2 + (1-$k)*$a), round($y2 + (1+$k)*$a),

);

imagefilledpolygon($image, $points, 4, $color);

return imagepolygon($image, $points, 4, $color);

srand((double)microtime()*1000000);

$vowels = array('a', 'e', 'i', 'o', 'u');

$cons = array('b', 'c', 'd', 'g', 'h', 'j', 'k', 'm', 'n', 'p', 'r', 's', 't', 'v',

'w', 'tr', 'cr', 'br', 'fr', 'th', 'dr', 'ch', 'ph', 'wr', 'st', 'sp', 'sw', 'pr');

// removed 'l', 'sl', 'cl'

$num_vowels = count($vowels);

$num_cons = count($cons);

$length = rand($minlen, $maxlen);

$start = rand(0, 1);

if ($start) {

$first = $cons;

$num_first = $num_cons;

$second = $vowels;

$num_second = $num_vowels;

} else {

$first = $vowels;

$num_first = $num_vowels;

$second = $cons;

$num_second = $num_cons;

}

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

$add = $first[rand(0, $num_first - 1)] . $second[rand(0, $num_second - 1)];

$password .= $add;

$i += (strlen($add) - 1);

}

//$password = substr($password, 0, $length);

return $password;