<?php
class Foo {}
class Bar extends Foo {}
class Baz {}
$foo = new Foo;
$bar = new Bar;
$baz = new Baz;
var_dump([
!($bar instanceof $foo),
!($baz instanceof $foo),
]);
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
array(2) {
[0]=>
bool(false)
[1]=>
bool(true)
}