3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php class C { function __get($key) {return ($key === 'x') ? 'x' : '';} function __isset($key) {return $key === 'x' || $key === 'y';} } $c = new C; var_export(empty($c->x)); var_export(empty($c->y)); var_export(empty($c->other));
based on L5Kko
Output for 5.1.0 - 7.2.0
falsetruetrue
Output for 4.3.0 - 5.0.5
truetruetrue