Multiple instanceof checks

Question

Is there a shorter way of checking if a object is part of a certain set of classes?

Using instanceof makes the if statement too long:

if($obj instanceof \Class1 || $obj instanceof \Class2 || $obj instanceof \Class3)

And this doesn't work:

instance of \Class1 || \Class2 || \Class3

It assumes that Class2 is constant.

Answer 1

makes the IF statement too long

[...]

Is there a shorter way

Sure.

Simply create a function:

function isOfValidClass($obj)
{
    $classNames = array('Class1', 'Class2');
    foreach ($classNames as $className) {
        if (is_a($obj, $className)) {
        return true;
    }

    return false;
}

Then you can use that in your code and not have to worry about your if statement "taking up too much room" (not that you should ever consider that an issue; statements should be as long as they need to).