if ($token instanceof Number) {
$tempStack->push($token);
} elseif ($token instanceof Operator || $token instanceof Funct) {
/** @var $token Operator|Funct */
if ($tempStack->count() < $token->numOfArgs()) {
throw new Exception(sprintf('Required %d arguments, %d given.', $token->numOfArgs(), $tempStack->count()));
}
$arg = $tempStack->popMultiple($token->numOfArgs());
$tempStack->push($token->execute(array_reverse($arg)));
}
}
return $tempStack->pop()->value;
}
public function evaluate()
{
$this->convertToRpn();
return $this->process();
}
}
/**
* sin(PI/2+2*PI)+cos(2*2*PI)+tg(2*PI)+ctg(PI/2+2*PI)+2^2/2-2+2*2-4 + ((2+2)*2-(4/2*2)*2) =
* 1 + 1 + 0 + 0 + 0
*/
$ret = null;
try {
$calc = new Calc($_GET['expression']);
$ret = $calc->evaluate();
} catch (Exception $e) {
$ret = $e->getMessage();
}
echo json_encode(array('result' => $ret));