php - Using a variable as an operator

Question

So I have something like the following:

$a = 3;
$b = 4;
$c = 5;
$d = 6;

and I run a comparison like

if($a>$b || $c>$d) { echo 'yes'; };

That all works just fine. Is it possible to use a variable in place of the operator? Something like:

$e = ||;

Which I could then use as

if($a>$b $e $c>$d) { echo 'yes'; };

Answer 1

No, that syntax isn't available. The best you could do would be an eval(), which would not be recommended, especially if the $e came from user input (ie, a form), or a switch statement with each operator as a case

switch($e)
{
    case "||":
        if($a>$b || $c>$d)
            echo 'yes';
    break;
}