3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $arr = array( 'foo' => false, 'bar' => '', 'baz' => null, 'olo' => 0, ); var_dump( isset($arr['foo']), isset($arr['bar']), isset($arr['baz']), isset($arr['olo']) );
based on 5jRvX
Output for 4.3.0 - 7.2.0
bool(true) bool(true) bool(false) bool(true)