Git.Storage.Web/Theme/plugins/jquery-validation/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';

?>