S2OJ/web/app/controllers/captcha.php

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PHP
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<?php
use Gregwar\Captcha\PhraseBuilder;
use Gregwar\Captcha\CaptchaBuilder;
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$builder = new CaptchaBuilder(null, new PhraseBuilder(4, "2345678abcdefhkmnrstuxz"));
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$builder->build();
$_SESSION['phrase'] = $builder->getPhrase();
header('Content-Type: image/jpeg');
$builder->build()->output();