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@ 2014-05-21T19:16:55Z

<?php
interface GrandparentInterface {}
interface ParentInterface extends GrandparentInterface {}

class X implements ParentInterface {}

var_dump(is_subclass_of('X', 'ParentInterface'));
var_dump(is_subclass_of('X', 'GrandparentInterface'));

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
is_subclass_of: documentation ( source)

preferences:dark modelive preview

29.04 ms | 402 KiB | 5 Q