v3.0.0.2

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<?php
require_once __DIR__ . '/config.php';
if (session_status() === PHP_SESSION_NONE) {
session_start();
}
function antibot_generate_text($length = 6) {
$chars = 'ABCDEFGHJKLMNPQRSTUVWXYZ23456789';
$text = '';
for ($i = 0; $i < $length; $i++) {
$text .= $chars[random_int(0, strlen($chars) - 1)];
}
return $text;
}
function antibot_render_svg($text) {
$width = 200;
$height = 70;
$len = strlen($text);
$svg = '<svg xmlns="http://www.w3.org/2000/svg" width="' . $width . '" height="' . $height . '" viewBox="0 0 ' . $width . ' ' . $height . '">';
$svg .= '<defs>';
$svg .= '<filter id="n">';
$svg .= '<feTurbulence type="fractalNoise" baseFrequency="0.65" numOctaves="3" stitchTiles="stitch"/>';
$svg .= '<feColorMatrix type="saturate" values="0"/>';
$svg .= '<feBlend in="SourceGraphic" mode="multiply" result="blend"/>';
$svg .= '<feComposite in="blend" in2="SourceGraphic" operator="in"/>';
$svg .= '</filter>';
$svg .= '</defs>';
$bg_colors = ['#f0f4ff', '#fff4f0', '#f0fff4', '#fdfdf0', '#f4f0ff'];
$bg = $bg_colors[array_rand($bg_colors)];
$svg .= '<rect width="' . $width . '" height="' . $height . '" fill="' . $bg . '" rx="6"/>';
$svg .= '<filter id="wave">';
$svg .= '<feTurbulence type="turbulence" baseFrequency="0.02 0.05" numOctaves="2" result="turb"/>';
$svg .= '<feDisplacementMap in="SourceGraphic" in2="turb" scale="4" xChannelSelector="R" yChannelSelector="G"/>';
$svg .= '</filter>';
$line_colors = ['#c0c8e0', '#e0c0c0', '#c0e0c0', '#d0d0c0', '#d0c0e0'];
for ($i = 0; $i < 6; $i++) {
$x1 = random_int(0, $width);
$y1 = random_int(0, $height);
$x2 = random_int(0, $width);
$y2 = random_int(0, $height);
$color = $line_colors[array_rand($line_colors)];
$stroke_w = round(random_int(10, 20) / 10, 1);
$svg .= '<line x1="' . $x1 . '" y1="' . $y1 . '" x2="' . $x2 . '" y2="' . $y2 . '" stroke="' . $color . '" stroke-width="' . $stroke_w . '" opacity="0.7"/>';
}
for ($i = 0; $i < 40; $i++) {
$cx = random_int(0, $width);
$cy = random_int(0, $height);
$r = random_int(1, 3);
$dot_colors = ['#9090b0', '#b09090', '#90b090'];
$c = $dot_colors[array_rand($dot_colors)];
$svg .= '<circle cx="' . $cx . '" cy="' . $cy . '" r="' . $r . '" fill="' . $c . '" opacity="0.5"/>';
}
$char_colors = [
'#1a3a8f', '#8f1a1a', '#1a6e1a', '#6e1a6e',
'#1a5a6e', '#8f4a00', '#2a2a8f', '#6e1a3a',
];
$slot_w = ($width - 20) / $len;
for ($i = 0; $i < $len; $i++) {
$char = $text[$i];
$x = 10 + $slot_w * $i + $slot_w / 2;
$y = random_int(38, 50);
$rotate = random_int(-18, 18);
$scale_x = round(random_int(85, 115) / 100, 2);
$scale_y = round(random_int(90, 110) / 100, 2);
$font_sz = random_int(26, 34);
$color = $char_colors[array_rand($char_colors)];
$svg .= '<text'
. ' x="' . round($x, 1) . '"'
. ' y="' . $y . '"'
. ' font-size="' . $font_sz . '"'
. ' font-family="Georgia, serif"'
. ' font-weight="bold"'
. ' fill="' . $color . '"'
. ' text-anchor="middle"'
. ' transform="rotate(' . $rotate . ' ' . round($x, 1) . ' ' . $y . ') scale(' . $scale_x . ' ' . $scale_y . ')"'
. ' filter="url(#wave)"'
. '>' . htmlspecialchars($char, ENT_XML1) . '</text>';
}
$svg .= '<rect width="' . $width . '" height="' . $height . '" fill="url(#n)" opacity="0.08" rx="6"/>';
$svg .= '</svg>';
return $svg;
}
$text = antibot_generate_text(6);
$_SESSION['antibot_answer'] = strtoupper($text);
$_SESSION['antibot_time'] = time();
header('Content-Type: image/svg+xml');
header('Cache-Control: no-store, no-cache, must-revalidate, max-age=0');
header('Pragma: no-cache');
header('Expires: Sat, 01 Jan 2000 00:00:00 GMT');
echo antibot_render_svg($text);