var_dump($b instanceof A); how to get true this intanceof

[bertrc]

<?php
class A {

}
class B {

}
class Displayable {

}
$b = new B;


var_dump($b instanceof B);
var_dump($b instanceof A);
var_dump($b instanceof Displayable);

?>

[dalecosp]

bool(true)
bool(false)
bool(false)
As expected? I see nothing wrong here.

[NogDog]

If you are asking how to test this in code to make some logical decision, perhaps, you could :

if($b instanceof Displayable) {
    echo "yes";
} else {
    echo "no";
}

You can also do the same thing with the is_a() function if you prefer -- just a style choice, really.