Setting a variable to an operator then executing it - php

Question

I'm new to PHP in general. I was messing with this code until I wanted to execute the function in one set instead of having to set and add, sub, div, mult function. How do I go about setting the variable operator with the two num sets?
Example pseudo code:
<?php
$Num1 = 10;
$Num2 = 5;
$operation = /;
$Sum = $Num1 $operation $Num2;
return $Sum;
Or something like:
<?php
// creating Class "Math"
class math {
//Executing the function
function exec($info = array()) {
return $info['num1'] $info['operation'] $info['num2'];
}
}
// Set info
$info = array(
'num1' => 10,
'num2' => 5,
'operation' => '/'
);
//execute the OOP
$math = new math;
echo $math->exec($info);

Answer 1

What you are asking for is referred to as the Strategy Pattern.
One way to do this is to define your functions
$multiply = function($operand0, $operand1) {
return $operand0*$operand1;
};
$add = function($operand0, $operand1) {
return $operand0+$operand1;
};
Then using your sample code:
class math {
//Executing the function
function exec($info = array()) {
return $info['operation']($info['num1'], $info['num2']);
}
}
// Set info
$info = array(
'num1' => 10,
'num2' => 5,
'operation' => $add
);
//execute the OOP
$math = new math;
echo $math->exec($info); //will print 15