PHP use string as operator

Question

Say I have a string, $char. $char == \"*\".

I also have two variables, $a and $b, which equal \"4\" and \"5\" respectively.

How do I get the res

Answer 1

You can use eval() as suggested by @konforce, however the safest route would be something like:

$left = (int)$a;
$right = (int)$b;
$result = 0;
switch($char){

  case "*":
    $result = $left * $right;
    break;

 case "+";
   $result = $left + $right;
   break;
// etc

}