- var_dump: documentation ( source)
- is_a: documentation ( source)
- is_subclass_of: documentation ( source)
<?php
class Foo {}
class Bar extends Foo {}
var_dump(is_a('Foo', 'Bar'));
var_dump(is_a('Bar', 'Foo'));
var_dump(is_subclass_of('Foo', 'Bar'));
var_dump(is_subclass_of('Bar', 'Foo'));