function math_pyramid_check(WC_Challenge $chall, $formula, $maxlen, $precision = 4) { error_reporting(E_ERROR); GWF_Debug::setDieOnError(false); GWF_Debug::setMailOnError(false); $len = strlen($formula); $tests = array('0' => 0, '1' => 0.2357, '3.14' => 7.2971, '10' => 235.7023, '100' => 235702.2604); $eval = new EvalMath(); $fa = "f(a) = {$formula}"; if (false === $eval->evaluate($fa)) { echo GWF_HTML::error('Math Pyramid', $chall->lang('err_formula', array(htmlspecialchars($fa)))); return false; } GWF_Debug::setDieOnError(true); GWF_Debug::setMailOnError(true); $back = GWF_HTML::message('Math Pyramid', $chall->lang('msg_formula', array(htmlspecialchars($fa))), false); $correct = 0; foreach ($tests as $a => $result) { $result2 = $eval->evaluate("f({$a})"); $result = sprintf('%.0' . $precision . 'f', $result); $result2 = sprintf('%.0' . $precision . 'f', $result2); if ($result === $result2) { $back .= GWF_HTML::message('Math Pyramid', $chall->lang('msg_correct', array($a, $result2, $result)), false); $correct++; } else { $back .= GWF_HTML::error('Math Pyramid', $chall->lang('err_wrong', array($a, $result2, $result)), false); } } require_once GWF_CORE_PATH . 'module/WeChall/WC_MathChall.php'; if ($chall->getID() > 0 && $correct === count($tests)) { if (false === WC_MathChall::insertSolution($chall->getID(), GWF_Session::getUserID(), $formula)) { $back .= GWF_HTML::err('ERR_DATABASE', array(__FILE__, __LINE__)); } else { $back .= GWF_HTML::message('Math Pyramid', WC_HTML::lang('msg_wmc_sol_inserted', array($len, WC_MathChall::getLimitedHREF($chall, $len))), false); } } # Check Len if ($len > $maxlen) { $back .= GWF_HTML::error('Math Pyramid', $chall->lang('err_too_long', array($len, $maxlen)), false); } echo $back; if ($correct === count($tests) && $len <= $maxlen) { if ($len < $maxlen) { echo GWF_HTML::message('Math Pyramid', $chall->lang('msg_new_record', array($len, $maxlen)), false); GWF_Settings::setSetting('WC_MATH_PYRAMID', $len); } $chall->onChallengeSolved(GWF_Session::getUserID()); } }