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@ 2013-04-03T11:13:17Z

<?php

interface A {}
class B implements A {}
class C extends B {}

$b = new B;
var_dump(is_a($b, 'A'));

$c = new C;
var_dump(is_a($c, 'A'));
var_dump(is_a($c, 'B'));
var_dump(is_a($c, 'C'));

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
is_a: documentation ( source)

preferences:dark modelive preview

30.23 ms | 402 KiB | 5 Q