Evaluating math formulas

[Alex_]

Hey.

 

So imagine this example...

 

 

class FormulaEvaluator {
...... //Construct & variables here..
 
public function exec() {
//Missing some lines here, but you get the idea
$formula = $this->formula;
$context = (array) $this;
ob_start();
$res = eval('return ' . $formula . ';');
}
}
 
$formulaEvaluator = new FormulaEvaluator();
$formula = '10 * (($Test * 2) + ($Test2 / 3))';
$formulaEvaluator->formula = $formula;
$formulaEvaluator->Test = 20000;
$formulaEvaluator->Test2 = 300000;
$res = $formulaEvaluator->exec();
echo $res; //1400000

 

The code we have is working as intended, but we want to avoid using eval. I know it's a pretty common question, and the answer is usually the same, but is there any way to do something similar without using eval?

[Barand]

Have you considered something like the calc() function in the second user note at http://php.net/manual/en/function.eval.php?