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<?php
use Gregwar\Captcha\CaptchaBuilder;
const CAPTCHA_PHRASE_LENGTH = 7;
require_once __DIR__ . "/../vendor/autoload.php";
session_start();
$mode = $_GET["m"] ?? "newcaptcha";
if ($mode === "newcaptcha") {
header("Pragma: no-cache");
header("Cache-Control: no-cache");
header("Location: ?m=captcha&r=" . urldecode(bin2hex(random_bytes(10))));
exit;
}
$charset = 'ABCDEFGHKLMNPQRTWXYZ234789abdefghkmnpqr';
$phrase = "";
for ($i = 0; $i < CAPTCHA_PHRASE_LENGTH; ++$i)
$phrase .= $charset[random_int(0, strlen($charset) - 1)];
$builder = new CaptchaBuilder($phrase);
$builder->setInterpolation(false);
$builder->build(256, 64);
$_SESSION["captcha_phrase"] = $builder->getPhrase();
if ($mode === "captcha") {
echo '<body background="?m=captchaimg&r=' . bin2hex(random_bytes(10)) . '">';
exit;
}
if ($mode === "captchaimg") {
header("Content-Type: image/jpeg");
$builder->save(null, 40);
exit;
}
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