3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php class A { function __isset($x) { echo '__isset: ', $x; return true; } } $a = new A; echo empty($a->prop);
Output for 5.3.0 - 7.2.0
__isset: prop1
Output for 5.1.0 - 5.2.17
__isset: prop
Output for 4.3.0 - 5.0.5
1