public function evaluate()
{
if (is_array($result = parent::evaluate())) {
throw new ParsingException('exp accept only one argument');
}
return (double) exp($result);
}
public function evaluate()
{
$result = parent::evaluate();
if (!is_array($result) || count($result) !== 3) {
throw new ParsingException('If must have 3 arguments, ex: if(a > 2, 1, 2)');
}
return $result[0] ? $result[1] : $result[2];
}
public function evaluate()
{
$result = parent::evaluate();
if (!is_array($result)) {
return $result;
}
return array_sum($result);
}
public function evaluate()
{
$result = parent::evaluate();
if (!is_array($result) || count($result) !== 2) {
throw new ParsingException('Power must have 2 arguments, ex: power(10,2)');
}
return pow($result[0], $result[1]);
}
public function evaluate()
{
$result = parent::evaluate();
if (!is_array($result) || empty($result)) {
return $result;
}
$count = count($result);
return array_sum($result) / $count;
}
public function evaluate()
{
$result = parent::evaluate();
if (is_array($result)) {
if (count($result) != 2) {
throw new ParsingException('Log accepts only 2 arguments');
}
return log($result[0], $result[1]);
} else {
$content = (string) $this->content;
if ($content == 'log(') {
return log10(parent::evaluate());
} else {
// ln
return log(parent::evaluate());
}
}
}
public function evaluate()
{
return tan(deg2rad(parent::evaluate()));
}
public function evaluate()
{
return sqrt(parent::evaluate());
}
