--TEST--
Checking trait_exists(): interface, trait, abstract and final class
--FILE--
<?php
interface a { }
abstract class b { }
final class c { }
trait d {}
var_dump(trait_exists('a'));
var_dump(trait_exists('b'));
var_dump(trait_exists('c'));
var_dump(trait_exists('d'));
?>
--EXPECT--
bool(false)
bool(false)
bool(false)
bool(true)