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

safest method is a switch construct:

function my_operator($a, $b, $char) {
    switch($char) {
        case '=': return $a = $b;
        case '*': return $a * $b;
        case '+': return $a + $b;
        etc...
    }
}