3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php echo (a+b)-b != a;
Output for 7.2.0 - 7.3.0alpha1
Warning: Use of undefined constant a - assumed 'a' (this will throw an Error in a future version of PHP) in /in/FJs4X on line 2 Warning: Use of undefined constant b - assumed 'b' (this will throw an Error in a future version of PHP) in /in/FJs4X on line 2 Warning: A non-numeric value encountered in /in/FJs4X on line 2 Warning: A non-numeric value encountered in /in/FJs4X on line 2 Warning: Use of undefined constant b - assumed 'b' (this will throw an Error in a future version of PHP) in /in/FJs4X on line 2 Warning: A non-numeric value encountered in /in/FJs4X on line 2 Warning: Use of undefined constant a - assumed 'a' (this will throw an Error in a future version of PHP) in /in/FJs4X on line 2
Output for 7.1.0 - 7.1.10
Notice: Use of undefined constant a - assumed 'a' in /in/FJs4X on line 2 Notice: Use of undefined constant b - assumed 'b' in /in/FJs4X on line 2 Warning: A non-numeric value encountered in /in/FJs4X on line 2 Warning: A non-numeric value encountered in /in/FJs4X on line 2 Notice: Use of undefined constant b - assumed 'b' in /in/FJs4X on line 2 Warning: A non-numeric value encountered in /in/FJs4X on line 2 Notice: Use of undefined constant a - assumed 'a' in /in/FJs4X on line 2
Output for 4.3.0 - 7.0.20
Notice: Use of undefined constant a - assumed 'a' in /in/FJs4X on line 2 Notice: Use of undefined constant b - assumed 'b' in /in/FJs4X on line 2 Notice: Use of undefined constant b - assumed 'b' in /in/FJs4X on line 2 Notice: Use of undefined constant a - assumed 'a' in /in/FJs4X on line 2