<?php
// It seems instanceof only supports checking for directly implemented interfaces, not inherited ones:
interface FooBarInterface {
}
class Bar implements FooBarInterface {
}
class Foo extends Bar {
}
$className = Foo::class;
var_dump($className instanceof FooBarInterface);
var_dump(is_subclass_of($className, FooBarInterface::class));
var_dump(class_implements($className));
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
bool(false)
bool(true)
array(1) {
["FooBarInterface"]=>
string(15) "FooBarInterface"
}