<?php
class A {}
class B extends A {}
class C extends A{}
class D {
function test(A $a) {
var_dump($a);
}
}
$b = new B;
$c = new C;
$d = new D;
$d->test($b);
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
object(B)#1 (0) {
}