3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php function foo($x) { return ($x >= 1) && ($x <= 1); } echo foo(a1) ? 'true' : 'false';
Output for 7.2.0 - 7.2.9
Warning: Use of undefined constant a1 - assumed 'a1' (this will throw an Error in a future version of PHP) in /in/Z4RU4 on line 8 false
Output for 5.6.30, hhvm-3.15.4 - 3.21.3, 7.0.0 - 7.1.21
Notice: Use of undefined constant a1 - assumed 'a1' in /in/Z4RU4 on line 8 false
Output for hhvm-3.22.0
Notice: Use of undefined constant a1 - assumed 'a1' in /in/Z4RU4 on line -1 false