3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = a + b; $b = a - b; $a = a - b;
Output for 7.2.0 - 7.2.6
Warning: Use of undefined constant a - assumed 'a' (this will throw an Error in a future version of PHP) in /in/3rsj9 on line 3 Warning: Use of undefined constant b - assumed 'b' (this will throw an Error in a future version of PHP) in /in/3rsj9 on line 3 Warning: A non-numeric value encountered in /in/3rsj9 on line 3 Warning: A non-numeric value encountered in /in/3rsj9 on line 3 Warning: Use of undefined constant a - assumed 'a' (this will throw an Error in a future version of PHP) in /in/3rsj9 on line 4 Warning: Use of undefined constant b - assumed 'b' (this will throw an Error in a future version of PHP) in /in/3rsj9 on line 4 Warning: A non-numeric value encountered in /in/3rsj9 on line 4 Warning: A non-numeric value encountered in /in/3rsj9 on line 4 Warning: Use of undefined constant a - assumed 'a' (this will throw an Error in a future version of PHP) in /in/3rsj9 on line 5 Warning: Use of undefined constant b - assumed 'b' (this will throw an Error in a future version of PHP) in /in/3rsj9 on line 5 Warning: A non-numeric value encountered in /in/3rsj9 on line 5 Warning: A non-numeric value encountered in /in/3rsj9 on line 5
Output for 7.1.0 - 7.1.20
Notice: Use of undefined constant a - assumed 'a' in /in/3rsj9 on line 3 Notice: Use of undefined constant b - assumed 'b' in /in/3rsj9 on line 3 Warning: A non-numeric value encountered in /in/3rsj9 on line 3 Warning: A non-numeric value encountered in /in/3rsj9 on line 3 Notice: Use of undefined constant a - assumed 'a' in /in/3rsj9 on line 4 Notice: Use of undefined constant b - assumed 'b' in /in/3rsj9 on line 4 Warning: A non-numeric value encountered in /in/3rsj9 on line 4 Warning: A non-numeric value encountered in /in/3rsj9 on line 4 Notice: Use of undefined constant a - assumed 'a' in /in/3rsj9 on line 5 Notice: Use of undefined constant b - assumed 'b' in /in/3rsj9 on line 5 Warning: A non-numeric value encountered in /in/3rsj9 on line 5 Warning: A non-numeric value encountered in /in/3rsj9 on line 5
Output for 5.6.0 - 5.6.30, hhvm-3.12.14 - 3.17.3, 7.0.0 - 7.0.20
Notice: Use of undefined constant a - assumed 'a' in /in/3rsj9 on line 3 Notice: Use of undefined constant b - assumed 'b' in /in/3rsj9 on line 3 Notice: Use of undefined constant a - assumed 'a' in /in/3rsj9 on line 4 Notice: Use of undefined constant b - assumed 'b' in /in/3rsj9 on line 4 Notice: Use of undefined constant a - assumed 'a' in /in/3rsj9 on line 5 Notice: Use of undefined constant b - assumed 'b' in /in/3rsj9 on line 5