Question

I have the following function that works properly, except for when you use the input value of 0. I tried searching around to see if the 0 is equated as a NULL or if I’m doing something wrong.

When a zero is input, it outputs advanced which is greater than 20. Can anyone explain? Thanks

I plan on making the switch equate 0-10, 11-20, 21-30, 31-40, 41+ but for this example i am just using two scenarios. Thanks

**EDIT I do want values when its 20 🙂

function strengthPlan( $data ) {

    $data = ( int ) $data;
    switch( $data ) {
        case( $data <= 19 ):
            $result = 'standard strength';
            break;
        case( $data >= 20 ):
            $result = 'advanced strength';
            break;
    }
    return $result;

}

echo strengthPlan( 0 );

Answer 1

Your logic is incorrect. Switch statements are checking for equality. Your code is checking whether $data is equal to TRUE or FALSE.

 case( $data < 20 ):

will evaluate to:

 case( TRUE ):

because 0 < 20.

Since 0 is not equal to TRUE but to FALSE (after conversion), the second case is run.

Basically, you cannot use switch case for < or > but only for ==.