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<?php require_once __DIR__.'/../vendor/autoload.php'; use Gregwar\Captcha\PhraseBuilder; // We need the session to check the phrase after submitting session_start(); ?> <html> <?php if ($_SERVER['REQUEST_METHOD'] == 'POST') { // Checking that the posted phrase match the phrase stored in the session if (isset($_SESSION['phrase']) && PhraseBuilder::comparePhrases($_SESSION['phrase'], $_POST['phrase'])) { echo "<h1>Captcha is valid !</h1>"; } else { echo "<h1>Captcha is not valid!</h1>"; } // The phrase can't be used twice unset($_SESSION['phrase']); } ?> <form method="post"> Copy the CAPTCHA: <?php // See session.php, where the captcha is actually rendered and the session phrase // is set accordingly to the image displayed ?> <img src="session.php" /> <input type="text" name="phrase" /> <input type="submit" /> </form> </html>