<?php

class foo {
}

class_alias('foo', 'bar');


class baz extends bar {
}

var_dump(is_subclass_of(new foo, 'foo'));
var_dump(is_subclass_of(new foo, 'bar'));
var_dump(is_subclass_of(new foo, 'baz'));

var_dump(is_subclass_of(new bar, 'foo'));
var_dump(is_subclass_of(new bar, 'bar'));
var_dump(is_subclass_of(new bar, 'baz'));

var_dump(is_subclass_of(new baz, 'foo'));
var_dump(is_subclass_of(new baz, 'bar'));
var_dump(is_subclass_of(new baz, 'baz'));

?>