silverstripe-framework/thirdparty/jquery-validate/demo/captcha/process.php

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<?php
// Begin the session
session_start();
// To avoid case conflicts, make the input uppercase and check against the session value
// If it's correct, echo '1' as a string
if(strtoupper($_GET['captcha']) == $_SESSION['captcha_id'])
echo 'true';
// Else echo '0' as a string
else
echo 'false';
?>