<?php

error_reporting(E_ALL);
session_start();
$size = 32;
$half_size = $size / 2;
$font_file = 'OptimusPrincepsSemiBold.ttf';
$_SESSION['captcha'] = $text = substr( md5( microtime() ), 0, 4 );
list(,,$width) = imagettfbbox($size, 0, $font_file, $text);
$im = imagecreate($width += $size, $height = $size * 2);
$bg = array( rand(170, 255), rand(170, 255), rand(170, 255) );
imagecolorallocate($im, $bg[0], $bg[1], $bg[2]);
$fc = array( rand(0, 85), rand(0, 85), rand(0, 85) );
$font_color = imagecolorallocate( $im, $fc[0], $fc[1], $fc[2] );
imagettftext($im, $size, 0, + $half_size, $size + $half_size, $font_color, $font_file, $text);

$width1 = 200;
$height1 = 80;
$offset_x = ($width1 - $width) / 2;
$offset_y = ($height1 - $height) / 2;
$rand1 = rand($half_size, $size) / 1000;
$rand2 = rand(0, $width / 2);

// так эта ебланская библиотека нихуя не рисует
// $im1 = imagecreate($width1, $height1);
// imagecolorallocate($im1, 255, 255, 255);
$im1 = imagecreatetruecolor($width1, $height1);
imagefilledrectangle( $im1, 0, 0, $width1, $height1, imagecolorallocate($im1, $bg[0], $bg[1], $bg[2]) );

for ($y = 0; $y < $height; ++$y) {
    for ($x = 0; $x < $width; ++$x) {
        $colors = imagecolorsforindex( $im, imagecolorat($im, $x, $y) );
        $color = imagecolorallocate( $im1, $colors['red'], $colors['green'], $colors['blue']);
        $z = $y + floor( $half_size * sin($rand1 * $x + $rand2) );
        imagesetpixel($im1, $offset_x + $x, $offset_y + $z, $color);
    }
}

$line_color = imagecolorallocate( $im1, $fc[0], $fc[1], $fc[2] );
// линии
for ($i = 0, $c = rand(3, 5); $i < $c; ++$i) {
    imageline( $im1, rand(0, $width1 - 1), rand(0, $height1 - 1), rand(0, $width1 - 1), rand(0, $height1 - 1), $line_color );
}

imagefilter($im1, IMG_FILTER_GAUSSIAN_BLUR);
header('Cache-Control: no-cache, must-revalidate');
header('Expires: Sat, 26 Jul 1997 05:00:00 GMT');
header('Content-type: image/png');
imagepng($im1);

?>